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W-lvetica#|x`H1`D4PkC"S^11>bbu"::Dg1:11bbbbbbbbbb11gggbuuuk1Xubuukuuuk111Rb:bbXbb1bb''X'bbbb:X1bXXXX;.;g:=::m:::mmmmm::::::mm:k1mubububububXubububub11111111bbbbbbbbbuXubbkbuXmmmmumububXXXXbububububbmbbbbbb:k:k::=kmmX:uXb'b:b:b:b'bmbbbb:::uXuXuXuXk:k:k:mbbbmbuXkXkXKQmmmm^b:kbbbbmbA@mmbmmbmmmmmmm:b:mmmbbmmmmmmmmmmmmXXmmmmmmmmmmmmmmmmmmcm`m`mm`m:mmmmmm}}}mjjmmmmmmmmmmmmmmm0mm}mmmmmmmmmmmmmmmmmmmmmmm}Mmmmmmmmmmmmmjmmmtmmmmmmmmm`'mmm`mmjmlWmmmmmmmmmmmmmmmmmmmW`mmmmjmMQMS PS Jet Plus /800 II QPJPII.PRSPl`D4PkCg2W_qD|xHelveticaCourier@,`H1`D4PkCmQrrr r  @C2 KLTG@,`H1`D4PkCmQrrr r  @C;,>>> >  @C ` X` hp x (#%'H   x|@  3'3'Standard6'6'StandardC6QMS $=R- Xt2  ` `  <  <AP IX32E < XXt  ` `  <  <AP IX32E < Xcm (3149) K (3149)  X Revised Recommendation M.140  `  ,DESIGNATION OF INTERNATIONAL CIRCUITS, GROUPS, GROUP AND LINE LINKS, ,DIGITAL PATHS, DATA TRANSMISSION SYSTEMS AND RELATED INFORMATION Explanation   HDesignation of international routes*: circuits, groups, blocks etc. are of great importance for identification and information. Technical developments specially due to digital technology have brought a much greater variety of techniques and allow for a more efficient use of equipment. Information on the applied techniques are of great interest to the staff working in the field of maintenance and operation. Operational conditions nowadays can be more complicated than before, e.g. as a consequence of more competition in the field of telecommunication. On the other hand automated file handling is a necessity for the administration and standardization of designations is an important factor to enable this. To cover the need for standardized designations which are easy to handle but can give precise information, designations have been built up from two layers: H layer 1 provides the unique identification = the Designation. H layer 2 provides the necessary additional information which must be known at both terminations of the routes: the Related Information.$ HIf administrations need more route data to be stored, they are free to create independently or bilaterally a 3rd layer for which no standardization is intended for the time being. HThe general format of layer 1 for the designations of all types of international routes is as follows:   format  Town A/ suffix Town B/ suffix Function code Serial number   number of  <12 1  <3 1 <12 1  <3 1  <6  <4  characters              HThe suffix is especially meant for international public switched circuits. It is optional for international fixed circuits, groups, group links, digital blocks and paths and data transmission systems. It supplies detailed information on the termination of the routes. The first part, the traffic relation, presents origin and destination of a route. The function code shows the type of route whilst the serial number counts the routes with the same traffic relation and same function code. If a town name exceeds 12 characters, administrations should supply a suitable abbreviation which should be unique. If identical place names occur in different countries, and if confusion is likely to arise, the administrations concerned should agree to identify the country in the circuit designation by adding after the place name a threeletter country code as defined in ISO 3166. This country code must be included within the 12 characters of town name, if necessary by providing an abbreviation of the town name. The serial number is to be written without leading zero's.  * "Route" covers here all types of telecommunication connections, circuits, groups, blocks, etc. ( HThe general format for layer 2 (Related Information) is as follows: H1.  ...., ....; H2.  ...., ....; H3.  ...., ....; H . H . H . H . HThe numbers indicate the various items. Each item provides information on the route, e.g. operational: operating companies and control station, etc., or technical: analogue/digital, use of special equipment, etc. The items provide flexibility in designation information because they can be extended in the future if there is a need. HThis Recommendation on designations contains the sections: H1)  Designations of international public switched circuits. H2)  Related information for international public switched circuits.$ H3)  Designations of fixed (nonswitched) circuits.$ H4)  Related information for fixed circuits.$ H5)  Designations of international groups (bidirectional and unidirectional).$ H6)  Designations of international group links.$ H7)  Related information for international groups and group and line links.$ H8)  Designations of international digital blocks (bidirectional and unidirectional).$ H9)  Designations of international digital paths.$ H10)  Designation of the international mixed analogue/digital transmission network.$ H11)  Designations of international data transmission systems.$ H12)  Related information for international digital blocks, digital paths and data transmission systems.$ HAt the end of the Recommendation, an annex gives the reference paragraph numbers for the various types of routes.   Note For the definitions of unidirectional and bidirectional, as for those of one N*ԫway and bothway, reference is made to Recommendation E.600 (Definitions 14.02 14.08).  Implementation HIt is recommended to apply the new designation types for newly installed routes starting on 1 January 1990 (or earlier after agreement of administrations involved). HEach time when a new route (circuit, block, data transmission system, etc.) is being installed the route gets the new designation. The Related Information required for maintenance and operation on the route is gathered and put into a record for that route. For circuits, reference is made to RecommendationsM.570 and M.1045 "Preliminary exchange of information". HThe same procedure should be used for setting up other routes: digital blocks and paths (ref. Recommendation M.465) and data transmission systems (ref.RecommendationsM.1350 and M.1370). Existing designations should be converted gradually but at the latest on 1 January 1994. For the conversion, the administration which has control station responsibility will supply a proposal which contains the new designation (if this is different) and the Related Information (so layer 1 + layer 2). HAdministrations are urged to keep the Related Information up to date. To that end, the administration where the change originates will inform the other administrations involved. 1.HDesignations of international public switched circuits 1.1HGeneral HThe format of the designation of public switched circuits is:   format of  Town A/InternationalTown B/International Function Serial  designation  Exchange Exchange Code Number    Suffix Suffix   signs  Slash Hyphen Slash Space No Space   number of  < 12 1 < 3 1 < 12 1 < 3 1 1 <  characters       Traffic relation H Town A and B H(Maximum 12 characters or space)(Note 1) refers to the names of the two towns in which the international exchanges of the circuit are located. The place names in all types of designation should always be written in Roman characters taking the official name of a town as used in the country to which it belongs. In the case of identical place names in different countries, the administrations should agree to make the place names unique. H International Exchange Suffix H(Maximum three alphanumeric characters). The international exchange is indicated by letters, digits or a combination. The suffix will refer to the whole exchange (building or to a part of it)(Note 2). It will be chosen by the administration mQ  (Notes 3 and 4). Function code H(One or two alphabetical characters). The function code indicates the type of circuit. Serial number H(Maximum four numeric characters). Serial numbering starts anew if there is a difference in: H Town A or town B H International Exchange Suffix H Function Code. Note 1 If the name of the town exceeds 12 characters the responsible administration will supply an appropriate abbreviation, which should be unique. Note 2 In the example given in the figure there may be only one suffix or three to be decided by the administration. Note 3 The three alphanumeric characters make it possible to include carrier's name information in the suffix, e.g. Tokyo/SJK the international exchange in TokyoShinjuku where the K in the suffix reflects the responsible carrier KDD. Note 4 The different companies operating in the same town have to agree on the suffices they use, so that they are different. 1.2HTelephone type circuits 1.2.1HGeneral N*Ԍ HPossible function codes are: HM: for manual telephone circuits; HZ: for automatic and semiautomatic telephone circuits in oneway operation; HB: for bothway telephone circuits. Serial number   HH(Maximum four numeric characters). Serial numbering starts anew if there is a difference in:(#H  `  H Town A or town B H International Exchange Suffix(Note 5) H Function code.  ` 8 Note 5 On bilateral agreement administrations may wish to apply a serial number on a towntotown basis rather than on an exchangetoexchange basis. 1.2.2HTelephone circuits used in manual operation HThese circuits are designated as follows: H The terminal points of the circuit are arranged in alphabetical order;Ơ# H the function code is: M. Example:  8 HHThe first telephone circuit for manual operation between London Keybridge and Paris Bagnolet is designated:!H  `  HLondon/KBParis/BAG M1. 4  `  1.2.3HHOneway telephone circuits used for semiautomatic or automatic operation!H HThese circuits are designated as follows:   H the terminal points of the circuits are arranged in the order according to the direction of operation of the circuit;(# H the function code is: Z. Serial numbering:   HHCircuits operated in the direction corresponding to the alphabetical order of the terminations should have odd numbers. Circuits operated in the direction corresponding to an inverse alphabetical order of the terminations should have even numbers(Note 6).$H  `   ` H Note 6 On bilateral agreement administrations may wish to apply continuous serial numbering on Z + B circuits. Examples:  H HHThe 11th circuit operated in the London Mollison to Montreal 1TE direction (alphabetical order of towns) is designated:8"H  `  HLondon/SMMontreal/1TE Z21.  ` ( HHThe ninth circuit operated in the Montreal 1TE to London Mollison direction (inverse alphabetical order of towns) is designated:ư"H  (`  HMontreal/1TELondon/SM Z18.  `  1.2.4HHBothway telephone circuits used for semiautomatic or automatic operation8"H HThese circuits are designated as follows:   H the terminal points of the circuit are arranged in alphabetical order;$ H the function code is: B. Example:  8 HHThe first bothway circuit between London Kelvin and New York 24 is designated:Ơ#H  8`  HLondon/JNew York/24 B1. " 1.3HCircuits used for switched telex and telegraph service HSee CCITT Recommendation R.70. 1.4HCircuits in the international public switched data network HThese circuits are designated as follows:  ` ( HH©X the terminations of the circuit are arranged in alphabetical order;ư"  (`  H the function code is: XD. Example:  ` X HHThe first international public switched data circuit between OsloA and StockholmHYX is designated:ƀ%H  X`  HOslo/AStockholm/HYXXD1. 1.5HRelated Information  `  HThe additional information on public switched circuits is covered by the following items: H1)  urgency for restoration; H2)  terminal countries; H3)  carriers' names; H4)  control and subcontrol station(s); H5)  fault report points; H6)  routing; H7)  association; H8)  equipment information; H9)  use; H10)  transmission medium information; H11)  composition of transmission; H12)  bandwidth or bit rate; H13)  signalling information.  X HThe various items will be dealt with in section2, "Related information for international public switched circuits". 2HHRelated information for international public switched circuitsƀ%H 2.1HUrgency for restoration N*Ԍ HThis item supplies information on the urgency of restoration of the circuit based upon bilateral agreement between the terminal administrations. Format: H1.  xxx .... xx; (maximum 10 characters). HIllustration: Ha)  If the priority is top: 1 H If the priority is second: 2 H If the priority is third: 3 Hor Hb)  If repair is required within, e.g., 24 hours: < 24h Hor Hc)  If no urgency has to be indicated: 2.2HTerminal countries HThis item presents the countries in which the circuit is terminating. Format: H2.  XXX, YYY; (three characters for each). Specification: HXXX: code for country of town A HYYY: code for country of town B Remark: HThe codes are according to ISO Standard 3166 "Specification for codes for the representation of names of countries". Example: Hfor the circuit London/KBTokyo/SJK Z101: H2.  GBR,JPN; 2.3HNames of administrations or carriers HThis item records the names of the carriers which operate the circuit. Format: H3.  YYYYYY, ZZZZZZ; (maximum six characters for each). Specification:  N* ԌHYYYYYY: code for company operating in town A HZZZZZZ: code for company operating in town B Example: Hfor the circuit London/KBTokyo/SJKZ101 operated by BTI and KDD. H3.  BTI, KDD; 2.4HControl station (subcontrol station(s)) HThis item lists the appointed control station and subcontrol stations (according to Recommendations M.80andM.90). HFurther details about the stations can be found in the ListofContactPoints (Recommendation M.93). Format: H4.  CS : designation of control station, H SCS1: designation of subcontrol station, H SCS2: designation of subcontrol station, H . . . . . . . . H . . . . H SCSn: designation of subcontrol station; Specification: HCS : designation of the control station, HSCS1: designation of the terminal subcontrol station, HSCS2: if applicable: other subcontrol stations, HSCSn: etc. have to be placed in the geographical order according to the traffic relation; Example:  X HHfor the circuit New York/10Stockholm/1 B1 where New York is the control station and subcontrol stations are in London and Stockholm:8"H  `  H4.  CS : New York, H SCS1: Stockholm, H SCS2: London. 2.5HFault report points  `  HThis item presents the names of both fault report points on the circuit. N* Ԍ  H HFurther information about the fault report points can be found in the List of Contact Points (Recommendation M.93). Format: H5.  Designation of fault report point, designation of faultreportpoint;Ɛ$ Specification:  H8 HHThe first faultreportpoint is the fault report point belonging to country of town A.Ơ#H  8`   `  HHThe second fault report point to that of the country of town B.H!H  `  Example:  ` 8 HHFor the circuit London/MReims/IP1 Z999 with fault report points in London M and Reims XRE:Ơ#H  8`  H5.  London/M, Reims/XRE; 2.6HRouting  ` H HThis item shows the international primary groups or primary block and channel number which carry the circuit. HIf there are more than one, the groups or blocks appear in the geographical order from town A to town B. Format: H6.  Designation of an international primary group or primary block/channel number, designation of a primary group/channel number, .........., designation of a primary group/channel number;Ɛ$ Note Primary groups or blocks can be unidirectional as well. Two consecutive unidirectional groups or blocks are separated by a "+" sign instead of a comma. Example: HFor a circuit Paris/ARCSantiago/1 Z27: H6.  LondonParis 1204/4, Paris(MU) 1202/2+Santiago(MU) 1203/3;   2.7HAssociation HThis item informs whether there are associated circuits and if so, of which nature. Format: H7.  Association code: Designation of associated circuit; Specification: HIf the circuit has a reserve circuit the association code is:  H HHS followed by the function code and the serial number of the principal circuit.%H  `   `  HIf the circuit is a reserve circuit: the association code is:   HHFunction code followed by S and the serial number of the reserve circuit.8"H  `  Example 1: H7.  ZS13: Roma/AS1Zuerich/SEL T1 Read:  ` H HThe actual circuit Z13 is a reserve circuit for the circuit Roma/AS1 Zuerich/SELT1. 2.8HEquipment information HThis item records any equipment in the circuit which requires special maintenance attention. Format: H8.  XX, XX, XX, XX, XX; Specification:  H HHIf the circuit has been routed via analogue circuit multiplication equipment: AM(#H  `   ` ( HHIf the circuit has been routed via digital circuit multiplication equipmentư"H  (`  H if reduced bit rate encoding is used: RB H if speech interpolation is used: SI HHIf the circuit has a compandor: COxH HHIf the circuit has an echo suppressor: ESxH HHIf the circuit has an echo canceller: ECxH  ` X HHIf the circuit has an echo suppressor in terminal country of townA and an echo canceller in terminal country of townB: ES, EC (any combination of EC and ES is possible)ƀ%H N* ԌHHIf the circuit is a bearer circuit: BCƀ%H  X`  HHIf the circuit is a derived circuit: DCxH  `  Note 1 If there is a need to record an additional special equipment, the free places for a code are available for this purpose. They can be used after bilateral agreement between the administrations. The codes must be unique and shall have two characters. Note 2 A bearer circuit refers to the circuit type that is continued to be provided in the case of a breakdown of the circuit multiplication equipment. For a derived circuit this is not the case. 2.9HUse HThis item supplies information on the usage of the circuit. It is concerning the role of the circuit in the traffic (e.g., belonging to a final route) and the usage by the user. Format: H9.  XX, YYYY; (maximum seven characters) Specification: HXX refers to the type of traffic carried by the circuit: H if it belongs to a final group of circuits: FN H if it belongs to a overflow group of circuits: OF H if it belongs to a transit group of circuits: TR H if the information is not known: HYYYY refers to the use of the circuit: HHin the case where a public telephone circuit is used for phototelegraphy or facsimile: F%H  `  2.10HTransmission medium information  `  HThis item identifies whether a satellite is involved in the routing of the circuit. Format: H10. ST; or ; Specification: Hif the circuit has been routed via satellite: ST Hif the circuit is not being routed via satellite: Example:   HHFor the circuit Amsterdam/2HNew York/24 Z33 routed partly via N*  satellite: H!H  ` H10. ST; 2.11HComposition of the transmission HThis item shows the type of transmission on the circuit. Format: H11. A; N; or C; Specification: Hif the transmission is analogue: A H Hif the transmission is digital: N Hif the transmission is mixed analogue/digital: C 2.12HBandwidth or bit rate  `  HThis item shows the bandwidth (in the case of an analogue or mixed circuit) or the bit rate (in the case of a digital circuit). Format:   HH12. xxxx.x Hz; or kHz; or MHz; bit/s; or kbit/s; or Mbit/s; (leadingzeros, and if the decimal is a zero, this decimal and the decimal point may be omitted).H  `  HRule for the notation of figures: Hif the figure is up to 999, use Hz, bit/s;  `  Hif the figure is between 1000 and 9 999 999, use kHz, kbit/s; Hif the figure is 10 000 000 or more, use MHz, Mbit/s. Specification:   Hif the circuit is analogue or mixed: the bandwidth in Hz, kHz, MHz; Hif the circuit is digital: the bit rate in bit/s, kbit/s, Mbit/s. 2.13HSignalling information HThis item presents the signalling information that applies to the circuit. Format: H13.  xx....xx; (max. 20 characters) Specification: Hif the CCITT Signalling System R2 is applied: R2 Hif the CCITT Signalling System R2 digital is applied: R2D N*Ԍ Hif the CCITT Signalling System No. 4 is applied: C4 Hif the CCITT Signalling System No. 5 is applied: C5 Hif the CCITT Signalling System No. 6 is applied: C6, xxx/yy Hxxx/yy refers to band and circuit number respectively   HHif the CCITT Signalling System No. 7 is applied: C7, xxxx, YYYYY,(#H  `  ZZZZZ Hxxxx refers to the Circuit Identification Code (CIC)  `  HHYYYYY refers to the International Signalling Point Code (ISPC) for townA/international exchange$H  `   `  HZZZZZ refers to the ISPC for townB/international exchange Example: HFor a circuit with C6signalling type: Hbeing the seventh circuit in band number 32 H13.  C6, 032/06; (circuit counting starts at 0)   Full example for the designation information of a public switched telephone circuit HThe circuit is the 604th bothway telephone circuit between Sherman Oaks 4ES and Tokyo Shinjuku, operated by AT&T and KDD. The signalling type is CCITT No. 6 with band/circuit number assigned as 000/03. The control station and subcontrol station of the circuit are Sherman Oakstransmission station 1 and Tokyotransmission station 1 respectively. The two stations are also the fault report points of the circuit. The circuit has been routed on fourth channel of the first group between Sherman Oaks and Ibaraki which is routed via satellite and has been connected to digital blocks in domestic networks. The designation HSherman Oaks/4ESTokyo/SJK B604 Related information H1.  2; H2.  USA, JPN; H3.  ATT, KDD; H4.  CS: Sherman Oaks/TS1, SCS1: Tokyo/TS1; H5.  Sherman Oaks/TS1, Tokyo/TS1; H6.  IbarakiSherman Oaks 12C01/4; H7.  ;  N*ԌH8.  ; H9.  ; H10.  ST; H11.  C; H12.  3.4 kHz; H13.  C6, 000/03; 3.HDesignations of international fixed (nonswitched) circuits 3.1HGeneral HThis chapter comprises the sections on designations of: 3.2HLeased circuits 3.3HPublic fixed circuits    P#LThe format of the designation of fixed circuits is:   format of  Town A/Transmission Town B/Transmission Function Serial  designation  station(Note 1) station(Note 1) code Number    suffix suffix       (Optional) (Optional)      signs  Slash Hyphen Slash Space No Space      number of  <12 1 < 3 1 < 12 1 < 3 1 14 < 4  characters       Traffic relation HTowns A and B possibly with a transmission station suffix identify the terminal points of the circuit. HThe identification of the terminal point is up to the administration concerned. In the case that a town name exceeds the maximum length of 12 characters, the administration should supply a suitable abbreviation which must be unique. Transmission station suffix (maximum 3 characters) is an optional field which may be used to further identify the terminal point, e.g. when there is more than one carrier operating in the town. The necessity for a suffix and its form should be decided by the administration operating the circuit in the town concerned. Note 1 For some circuits the international exchange may be more suitable (see the examples in  3.3.9 and 3.2.15. Function code H(Maximum four characters) identifies the type of the circuit; see 3.2 and 3.3 below. Serial number H(Maximum four digits). There should be a separate serial numbering series for each traffic relation and function code. In case of more than one carrier in the town the serial numbering will be on a transmission station to transmission station basis. HThe layer 1 designations of the different categories of leased circuits are given below. In special cases in which CCITT Recommendations do not apply, agreement should be reached between the terminal administrations. 3.2HInternational leased circuits 3.2.1HGeneral HLeased circuits are fixed circuits for private services or particular purposes. They are distinguished by the letter P. HThe layer 1 format for leased circuits is as stated in 3.1. HPossible function codes are: HP :  for analogue leased circuits used wholly for telephony HTP :  for analogue leased circuits used for voicefrequency telegraphy HTDP:  for analogue leased circuits used for TDMtelegraphy HDP :  for analogue leased circuits used wholly for data transmission HFP :  for analogue leased circuits used wholly for phototelegraphy or facsimile % HRP :  for analogue unidirectional soundprogramme leased circuits HRRP:  for analogue reversible soundprogramme leased circuits HVP :  for analogue unidirectional television programme leased circuits HVVP:  for analogue reversible television programme leased circuits HXP :  for analogue leased circuits used for a multiple kind of transmissions HNP :  for digital leased circuits. Note In case of leased circuits connecting three or more locations the letter M should follow these function codes. 3.2.2HAnalogue leased circuits used for telephony HThe terminal points of the circuits are arranged in alphabetical order. HThe function code is: P. Example:   HHThe first analogue leased circuit used for telephony between Paris and Wellington, New Zealand, is designated:%H  `  HParisWellingtoNZL P1 3.2.3HAnalogue leased circuits used for telegraphy 3.2.3.1HVoicefrequency telegraphy  `  HThe terminal points of the circuits are arranged in alphabetical order. The function code is: TP. Example: HThe first analogue leased circuit used for voicefrequency telegraphy Mt"Ibetween Bern 1RS and New York 1RC is designated: HBern/1RSNewYork/1RCTP1. 3.2.3.2HTDMtelegraphy HThe terminal points of the circuits are arranged in alphabetical order. The function code is: TDP. Example: HThe third analogue leased circuit used for TDMtelegraphy between I ELondon and Montreal is designated: HLondonMontrealTDP3. V' 3.2.4HLeased telegraph circuits HSee Recommendation R.70. 3.2.5HAnalogue leased circuits used for data transmission HThe terminal points of the circuits are arranged in alphabetical order. HThe function code is: DP. Example: HThe third analogue leased circuit used for data transmission between L"HLondon and Paris is designated: HLondonParis DP3. 3.2.6HAnalogue leased circuits used for phototelegraphy or facsimile HThe terminal points of the circuits are arranged in alphabetical order. If these circuits are different from Pcircuits the function code is: FP. Example: HThe second analogue leased circuit used for phototelegraphy between K!GLondon and Paris is designated: HLondonParis FP2. HIf normal Pcircuits are used, then these circuits are designated accordingly. 3.2.7HAnalogue leased circuits used for soundprogramme transmission 3.2.7.1HAnalogue leased unidirectional soundprogramme circuit HThe terminal points of the circuits are arranged in the order corresponding to the direction of transmission (instead of alphabetically if this is different). HThe function code for these circuits is: RP. Serial numbering: HCircuits which transmit in the direction corresponding to the alphabetical order of the terminals should have odd serial numbers, circuits in the other direction even numbers. Examples:   HHThe first leased soundprogramme circuit transmitting in the direction Montreal to Wellington (New Zealand) will be designated: %H  `  HMontrealWellingtoNZLRP1 &  `  HThe first leased soundprogramme circuit transmitting in the direction HWellington (New Zealand) to Montreal will be designated: HWellingtoNZLMontreal RP2 3.2.7.2HAnalogue leased reversible soundprogramme circuits HThe terminal points of the circuits are arranged in alphabetical order. HThe function code is: RRP. Example: HThe first leased circuit with reversible soundprogramme transmission Mt"Ibetween Montreal and Wellington (New Zealand) is designated: HMontrealWellingtoNZLRRP1 3.2.8HAnalogue leased circuits used for television transmission 3.2.8.1HAnalogue leased unidirectional television programme circuits HThe terminal points of the circuits are arranged in the order corresponding to the direction of transmission (instead of alphabetically if this is different). HThe function code is: VP. HCircuits which transmit in the direction corresponding to the alphabetical order of the terminals should have odd serial numbers, circuits in the other direction even numbers. Example: HThe first leased television programme circuit transmitting in the I Edirection Wellington (New Zealand) to Montreal will be designated: HWellingtoNZLMontreal VP2 3.2.8.2HAnalogue leased reversible television programme circuits HThe terminal points of the circuits are arranged in alphabetical order. HThe function code is: VVP. Example: HThe first circuit with reversible television transmission between I EMontreal and Wellington (New Zealand) is designated: HMontrealWellingtoNZL VVP1 # 3.2.9HLeased circuits used for digital video transmission HThese circuits are designated as digital leased circuits (irrespective of the use) ref. 3.2.15 and 3.2.16. HH3.2.10HAnalogue leased circuits connecting circuit multiplication terminal equipments at renters' premises%H HThese circuits are designated as normal leased circuits. The information that these circuits connect circuit multiplication terminal equipment can be recorded under item 9. "Use" of Related Information (see4.9). HCircuits routed via circuit multiplication equipment are also designated as normal circuits. The multiplication equipment appears under item8. "Equipment information" of Related Information (see4.8). HH3.2.11HAnalogue leased circuit used for transmission other than those designated in paragraphs above or used for combinations of transmissions%H HIn this category are circuits used for different transmissions at different times or circuits in which the bandwidth is divided into two or more bands, thus providing two or more derived circuits which may be used for different transmissions. HThe terminal points of the circuits are arranged in alphabetical order. HThe function code is: XP. Example: HBruxellesParis XP8. HH3.2.12HAnalogue leased circuits connecting three or more locations%H HInto this category fall multiterminal circuits of various types and configurations. Each section of the circuit should have a unique designation. A section is any part of the circuit which connects a branching point to either a customer terminal or another branching point. HInternational sections should use the designation described below. HThe terminal town points of each section are arranged in alphabetical order. HThe function code is formed by adding the letter M to the function codes recommended in 3.2.2 to 3.2.11 above. This leads, in principle, to the function codes PM, TPM, TDPM, DPM, FPM, RPM, RRPM, VPM, VVPM and XPM. HThe association between sections should be recorded in the RelatedInformation of each section under item 7 "Association" (ref.4.7). ^$ HWholly national sections with national designations may be included if bilaterally agreed. Example: HLet there be an international multiterminal leased circuit connecting Bruxelles and Paris (seventh PM circuit between Bruxelles and Paris) with branches from Bruxelles to Edinburgh (first PM circuit on this relation) and from Bruxelles to Aachen (fourth PMcircuit) and with an extension from Paris to Marseille. HThe international sections are designated: HBruxellesEdinburgh PM1 HAachenBruxelles PM4 HBruxellesParis PM7. 3.2.13HLeased analogue groups, supergroups, etc. HThese groups, supergroups, etc. will receive a circuit designation. The additional information on the constitution of these circuits is to be recorded under Related Information under item 12 "Bandwidth or Bit rate" (ref.4.12) and under item6 "Routing" ref.4.6). HThe function codes are according to the relevant codes for circuits. Example:  8 HHA supergroup between renters' premises in London and Paris for data transmission being the 15th leased circuit for data transmission on this relation is designated:Ơ#H  8`  HLondonParis DP15. 3.2.14HLeased analogue group, supergroup links  `  HThese group, supergroup and line links will receive a circuit designation. The additional information on the constitution of these circuits is to be recorded in Related Information under item 12 "Bandwidth or Bit rate" (ref4.12) and under item 6 "Routing" (ref. 4.6). Example:  X HH A group link provided between renters' premises in London and Montreal devoted to data transmission being the tenth leased circuit for data transmission on this relation is designated:ƀ%H  X`  HLondonMontreal DP10. 3.2.15HDigital leased circuits connecting two locations  ` ( HDesignations given below also apply for leased digital blocks and paths. V' Remark:  ( HFor digital leased circuits the use of the circuit will no longer be taken into account for the designation: the use may change without notification to the administration or may be unknown. HThe additional information concerning the bit rate is to be found in RelatedInformation under item12 "Bandwidth or Bit rate" (ref.4.12). HThe terminations of the circuit are placed in alphabetical order. HThe function code is: NP. Example:  8 HHThe fifth digital leased circuit between Birmingham and Toulouse is designated:Ơ#H  8`  HBirminghamToulouse NP5.  ` H Note Digital leased circuits consisting of a permanent switched connection. HIt may happen that a digital leased circuit has been routed via one or more international exchanges; in this case, they are designated as normal digital leased circuits. However, in such cases, an international exchange suffix may replace transmission station suffix. The information on being permanently switched is recorded in the Related Information under item8 "Equipment information" (ref.4.8). Example:  H HHThe 12th digital leased circuit between users' premises connected to transmission station TS2 in Athens and permanently switched in international exchange IP2 in Reims is designated:$H  `  HAthinai/TS2Reims/IP2 NP12.  `  3.2.16HDigital leased circuits connecting three or more locations   HVarious types and configurations of multiterminal circuits fall into this category. Each section of the circuit should have a unique designation.  h A section is any part of the circuit which connects a branching point to either a customer terminal or another branching point (see also RecommendationM.1055). HInternational sections should use the designation described below. HThe terminal points of each section are arranged in alphabetical order. HThe function code is formed by adding the letter M to the function code recommended in 3.2.15, so the function code is: NPM. HThe association between sections should be recorded in the RelatedInformation of each section under item7 "Association" (ref.4.7). HWholly national sections with national designations may be included if bilaterally agreed. ( Example:  h8 HHIn an international digital multiterminal leased circuit connecting Oslo, London, Paris, Roma and Amsterdam, the international section between Oslo and London (being the first NPM circuit on this relation) is designated:Ơ#H  8`  HLondonOslo NPM1. 3.3HFixed (nonswitched) public circuits 3.3.1HGeneral HThe designation format is according to section 3.1. HPossible function codes are: HR :  for a unidirectional soundprogramme circuit HRR:  for a reversible soundprogramme circuit  `  HRK:  for telephone type circuits for narrowband soundprogramme transmission8" HV :  for a unidirectional television circuit HVV:  for a reversible television circuit HF :  for a phototelegraphy or facsimile circuit HT :  for circuits providing voice frequency telegraph links HTD:  for circuits providing TDM telegraph systems HD :  for data transmission circuits HDL:  for circuits providing transfer links for common channel signalling systems.8" Remark  8 HInformation on whether a soundprogramme circuit forms with another sound programme circuit a stereophonic pair will be recorded in the RelatedInformation under item no.7 "Association" (ref.4.7). 3.3.2HCircuits used for sound programme transmission 3.3.2.1HCircuits used for unidirectional soundprogramme transmission HThese circuits are designated as follows:  8X HThe terminations of the circuit are arranged in the order corresponding to the direction of transmission (instead of alphabetically if this is different). HThe function code is: R. ( Serial numbering: HCircuits which transmit in the direction corresponding to the alphabetical order of the terminals should have odd serial numbers. Circuits which transmit in the direction corresponding to the inverse alphabetical order of the terminals should have even serial numbers. Example: HHThe first circuit transmitting in the direction Wellington (NewZealand) to Montreal is designated:ƀ%H  X`  HWellingtoNZL Montreal R2.  `  3.3.2.2HCircuits used for reversible soundprogramme transmission HThese circuits are designated as follows:   HThe terminations of the circuit are arranged in alphabetical order. HThe function code is: RR. Example:   HHThe first circuit with reversible soundprogramme transmission between London and Wellington (New Zealand) is designated:%H  `  HMontrealWellingtoNZL RR1.  ` ( HH3.3.2.3HTelephone type circuits used for narrow band soundprogramme transmissionư"H HThese circuits are designated as follows:  ( HIn the traffic relation the terminals of the circuit are arranged in the order corresponding to the direction of operation (instead of alphabetically if this is different). HThe function code is: RK. Serial numbering: HCircuits which transmit in the direction corresponding to the alphabetical order of the terminals should have odd serial numbers. Circuits which transmit in the direction corresponding to the inverse alphabetical order of the terminals should have even serial numbers. Example:   HHThe first telephonetype circuit set up for the narrowband sound programme transmission in the direction from Milan to Madrid is designated:(#H  `  HMilanoMadrid RK2. 3.3.3HCircuits used for television transmission (  `  3.3.3.1HCircuits used for unidirectional television transmission HThese circuits are designated as follows:  X HIn the traffic relation the terminations of the circuit are arranged in the order corresponding to the direction of transmission (instead of alphabetically if this is different). HThe function code is: V. Serial numbering: HCircuits which transmit in the direction corresponding to the alphabetical order of the terminals should have odd serial numbers. Circuits which transmit in the direction corresponding to the inverse alphabetical order of the terminals should have even serial numbers. Example:  X HHThe first unidirectional television circuit transmitting in the direction Paris to Helsinki is designated:!H  `  HParisHelsinki V2. 3.3.3.2HCircuits used for reversible television transmission HThese circuits are designated as follows:  `  HThe terminations of the circuit are arranged in alphabetical order. HThe function code is: VV. Example:   HHThe first reversible television transmission circuit between TokyoTS1 and New Delhi is designated:%H  `  HNew DelhiTokyo/TS1 VV1. 3.3.4HCircuits for digital audio and video transmission  `  HThese circuits are designated according to the data transmission systems, see section 11. 3.3.5HTelephone type circuits used for phototelegraphy or facsimile  X HCircuits used for phototelegraphy or facsimile which are different from normal telephone circuits will have the function code: F. HThe terminal points of the circuit are arranged in alphabetical order. HIf normal telephone circuits are used, they are designated accordingly. Information about the usage may be recorded in the Related Information under item9 "Use" (ref. 4.9). V' Example: HThe first circuit for phototelegraphy between Koebenhavn and Tokyo: HKoebenhavnTokyo F1. 3.3.6HHTelephone type circuits used to provide voice frequency telegraph linksƀ%H HThese circuits are designated as follows: HThe terminal points of the circuit are arranged in alphabetical order. HThe function code is: T. Example:  XH HHThe first circuit to provide a voice frequency telegraph link between Koebenhavn 1Montreal 1TE is designated:Ɛ$H  H`  HKoebenhavn/1Montreal/1TE T1.  `  HA reserve Tcircuit is designated according to its present function. The information of being a reserve Tcircuit is to be found in the RelatedInformation under item 7 (ref.4.8). 3.3.7HHTelephone type circuits used to provide TDM (Time Division Multiplex) telegraph systems$H HThese circuits are designated as follows: HThe terminal points of the circuit are arranged in alphabetical order. HThe function code is: TD. Example:  X HHThe first circuit used to provide a TDM telegraph system between London Keybridge and Montreal 1TE:ƀ%H  X`  HLondon/KBMontreal/1TE TD1.  ` H HA reserve TDcircuit is designated according to its present function. The information of being a reserve TDcircuit is to be found in the Related Information under item 7 (ref.4.7). 3.3.8HTelephone type circuits used for data transmission HThese circuits are designated as follows: HThe terminal points of the circuit are arranged in alphabetical order. HThe function code is: D. & Example:  H HHThe first circuit used for data transmission between Frankfurt1 and Toronto1TE is designated:$H  `  HFrankfurt/1Toronto/1TE D1.  ` 8 3.3.9HHTelephone type circuits used as a transfer links for common channel Signalling Systems No. 6 and No. 7Ơ#H HThese circuits are designated as follows: HThe function code is: DL. Example:  8 HHThe first data link used for common channel signalling between Sacramento 4ESS and Tokyo Shinjuku is designated:!H  `  HSacramento/4ESTokyo/SJK DL1. 3.4HRelated Information  `  HThe additional information on fixed circuits is covered by the following items: H1)  Urgency for restoration; H2)  Terminal countries; H3)  Carriers' names; H4)  Control and subcontrol station(s); H5)  Fault report points; H6)  Routing; H7)  Association; H8)  Equipment information; H9)  Use; H10)  Transmission medium information; H11)  Composition of transmission; H12)  Bandwidth or bit rate; H13)  Signalling information; H14)  Applicable CCITT Recommendations. & HThe various items will be dealt with in section 4. H"Related information for fixed circuits" 4.HRelated information for international fixed circuits 4.1HUrgency for restoration  8 HThis item supplies information on the urgency of restoration of the circuit based upon bilateral agreement between the terminal administrations. Format: H1.  XXX .... XX; (max. 10 characters) Illustration: Ha)  If the priority is top : 1 H If the priority is second: 2 H If the priority is third : 3 Hor Hb)  If repair is required within, e.g., 24 hours: < 24 h Hc)  If no urgency has to be indicated:  8 Note In the case of a digital leased circuit the priority or urgency may be decided upon by taking into account the bit rate of the circuit. 4.2HTerminal countries HThis item presents the countries in which the circuit is terminating. Format: H2.  XXX, YYY; (three characters for each) Specification: HXXX: code for country of town A HYYY: code for country of town B Remark: HThe codes are according to the ISO Standard 3166 "Specification for codes for the representation of names of countries". HExample for the circuit ParisWellington P1: H2.  FRA, NZL; 4.3HNames of administrations, carriers or broadcasting companies HThis item records the names of the carriers which operate the circuit or, in the case of soundprogramme and television circuits, the name of the broadcasting company. N* Format: H3.  YYYYYY, ZZZZZZ; (maximum six characters for each) Specification: HYYYYYY: code for company operating in town A HZZZZZZ: code for company operating in town B   HHExample for the circuit Bern/1RSNew York/1RC TP1 operating by Radio Suisse and RCA:$H  `  H3.  RS, RCA; 4.4HControl station (subcontrol station(s))  `  HThis item lists the appointed control station and subcontrol stations (according to Recommendations M.80 and M.90 or M.1012 and M.1013 for leased circuits). Further detail about the stations can be found in the List of Contact Points (Recommendation M.93). Format: H4.  CS :designation of controlstation, H SCS1:designation of subcontrol station, H SCS2: designation of subcontrol station, H . . . . H . . . . H . . . . H SCSn: designation of subcontrol station; Specification: HCS :  designation of the control station HSCS1: designation of the terminal subcontrol station HSCS2:  if applicable: other subcontrol stations HSCSn:  etc., have to be placed in the geographical order according to K!Gthe traffic relation. Example:   HHFor the circuit New York/10Stockholm/1 B1 where New York is the control station and subcontrol stations are in London and Stockholm:8"H  `  H4.  CS : ParisARC, H  SCS1: London/KB; ) 4.5HFault report points  `  HThis item presents the names of both fault report points on the circuit. Further information about the fault report points can be found in the List of Contact Points (Recommendation M.93). Format:  8 H5.  Designation of fault report point, Designation of fault report H point; Specification:  88 HHThe first fault report point is the one belonging to the country of townA.Ơ#H  8`   `  HThe second fault report point is that of the country of town B. Example: HThe fault report points for the circuit AthinaiRoma DP3: H5.  Athinai, Roma/TS1; 4.6HRouting   HThis item shows the international primary group(s) or primary block(s) and the channel number(s) which carry the circuit. 1 HIf there are more than one, the groups or blocks appear in the geographical order from town A to town B. Format: H6.   Designation of an international primary* group or primary block/channel number, designation of a primary group or block/channel number, ..., designation of a primary group or block/channel number.% Note Primary groups or blocks can be unidirectional as well. Two consecutive unidirectional groups or blocks are separated by a "+" sign instead of a comma. Example: HFor the circuit from London Mollison to Paris Archives DP7: H6.  LondonParis 1204/4; Example:   HHFor the wideband circuit FrankfurtLondon DP5 under item 6 must be registered:(#H  `  H6.  AmsterdamFrankfurt6005/2, AmsterdamLondon6002/3;   `  * In the case where a leased circuit consists of a group or block, the primary groups or blocks are to be replaced by the next higher groups or blocks. In this case the channel numbers are to be replaced by the group numbers. ) 4.7HAssociation HThis item informs whether there are associated circuits and if so of what nature. Format: H7.  Association code: Designation(s) of associated circuit(s); Specification: HIf the circuit has a reserve circuit the association code is: HS followed by the function code and the serial number of the principal N"Jcircuit. HIf the circuit is a reserve circuit: the association code is: HFunction code followed by S and the serial number of the reserve H: Dcircuit.   HHIf the circuit is one of a stereophonic pair, the other circuit will appear in this item. Association code is: H followed by a two digit serial number indicating the number of the stereophonic pair. This is followed by the function code and the serial number of actual circuit.$H  `   ` X HHIf the circut belongs to a multiterminal leased circuit the association code is PM, DPM, etc. (ref. 3.2.12 and 3.2.16) followed by the serial number of the circuit.ƀ%H  X`  Example 1: H7.  ST1: Roma/AS1Zuerich/SEL Z13; HRead: HThe reserve circuit for the principal circuit T1 is HRoma/AS1Zuerich/SELZ13 Example 2:  ` 8 HHIf the circuit London/KBParis/ARCR1 is bearing one channel of the second stereophonic pair from London to Paris and Ơ#H  8` HLondon/KBParis/ARC R5 the other channel of this pair: H7.  H02R1:London/KBParis/ARCR5; HRead:  ` 8 HHCircuit R1 being one of the stereophonic pair number two has as the other circuit of this pair: London/KBParis/ARCR5.Ơ#H  8`  #  Example 3:  `  HHIf the circuit BruxellesEdinburgh PM1 is a part of an international multiterminal telephone circuit connecting Bruxelles and Paris (being the seventh PMcircuit on that relation) with branches from Bruxelles to Edinburgh and to Aachen (being the second PMcircuit on that relation) and with an extension from Paris to Marseille, then for the circuit BruxellesEdinburgh PM1 under item 7 must be registered: $H  `  H7. PM1: AachenBruxelles PM2, BruxellesParis PM7;  ` h Note The international branches may appear in any order. National branches may be added after bilateral agreement. 4.8HEquipment information HThis item records any equipment in the circuit which requires special maintenance attention. Format: H8.  xx, xx, xx, xx, xx; Specification: HIf the circuit has been routed via analogue circuit multiplication J!Fequipment: AM;  h( HHIf the circuit has been routed via digital circuit multiplication equipmentư"H  (`  H using reduced bit rate encoding: RB H using speech interpolation: SI HHIf the circuit has a compandor: COxH  ` 8 HIf the circuit consists of a semipermanent switched connection: SP. 4.9HUse HThis item supplies information on the usage of the circuit if this usage is known by the administrations and if this is a help for maintenance on the circuit. Format: H9.  XXX..XX; (maximum seven characters) Specification: HXX.....XX allows the record of the usage of the circuit;  8 HHIf the circuit has been provided with circuit multiplication equipment at renters' premises with connecting channels: CC.%H  `  (! 4.10HTransmission medium information  `  HThis item identifies whether a particular transmission medium is required in the routing of the circuit. Format: H10.  ST. XX......XX; or 10. NS: XX......XX; or 10. ;8" H (XX......XX maximum ten characters) Specification:  ( HHIf the circuit has to be routed via satellite: ST followed by the designation of the satellite;ư"H  (`   ` 8 HHIf the circuit must not be routed via satellite: NS followed by the designation of the terrestrial transmission medium;Ơ#H  8`  HHIf there is no transmission medium requirement: xH  `  HExample for the circuit LondonParis DP3 that has to be routed via Hsatellite Telecom 1: H10.  ST.Tel 1; 4.11HComposition of the transmission HThis item shows type of transmission on the circuit. Format: H11.  A;, N; or C; Specification:  H  If the transmission is analogue: A HIf the transmission is digital: N HIf the transmission is mixed analogue/digital: C. 4.12HBandwidth or bit rate HThis item shows the bandwidth (in the case of an analogue circuit or mixed circuit or the bit rate (in the case of a digital circuit)). Format:  H HHX HH12.  xxxx.x Hz; or kHz; or MHz; bit/s; or kbit/s; or Mbit/s; (leading zero's and if the decimal is a zero, this decimal and the decimal point may be omitted).& %" HRule for the notation of figures: HIf the figure is up to 999, use Hz, bit/s. HIf the figure between 1 000 and 9 999 999, use kHz, kbit/s. HIf the figure 10 000 000 or more, use MHz, Mbit/s. Specification: HIf the circuit is analogue: the bandwidth in Hz, kHz, MHz HIf the circuit is digital: the bit rate in bit/s, kbit/s, Mbit/s  ( HHExample for the circuit BordeauxDarmstadt NP7 with a bit rate of 64kbit/s:ư"H  (`  H12.  64 kbit/s; 4.13HSignalling type  `  HThis item presents the signalling type that applies to the circuit (reference is made to Recommendations M.1045 and Q.8). Format: H13.  xxxxxxx; (maximum seven characters).   HHIf the signalling is of the type xxxx Hz/xx Hz: xxxx/xx. Otherwise the characters can be used on bilateral agreement between the two terminal administrations.%H  `  Example: HFor a circuit with inband signalling 1 000 Hz/20 Hz: H13.  1000/20; 4.14HApplicable CCITT Recommendations  `  HThis item records the CCITT Recommendation(s), e.g. applied as regards the parameters of the circuit. Format: H14.  Rec. X.xxxx, Rec. Y.yyyy; or 14. Rec. X.xxxx; or 14. ; Specification:   HHWhether 2, 1 or no Recommendation numbers are to be recorded is dependent on the need.!H  `  %# Example: H14.  Rec. M.1020;  ` ( Full example for the layered designation structures of a leased analogue circuit HThe circuit is the first analogue leased circuit used for data transmission between London and Frankfurt, operated by British Telecom International and Deutsche Bundespost. The signalling type is 500Hz/20Hz.  (H HThe control station and subcontrol station of the circuit are London Mollison and Frankfurt 0 respectively. HThe two stations are also the fault report points of the circuit. The circuit is routed on third channel of the first group between Frankfurt and London. HAs regards the parameters of the circuit, Recommendation M.1020 is applied. The maintenance contract between administrations and customer is repair within 24 hours. The designation: HFrankfurtLondon DP1. Related Information: H1)  < 24 h; H2)  DEU, GBR; H3)  DBP, BTI; H4)  CS: London/SM; H SCS1: Frankfurt/0; H5)  Frankfurt/0, London/SM; H6)  FrankfurtLondon 1201/3; H7)  ; H8)  ; H9)  D; H10)  ; H11)  A; H12)  3.4 kHz; H13)  500/20; H14)  Recommendation M.1020;  N*$Ԍ In the case where a leased circuit consists of a group or block, the primary groups or blocks are to be replaced by the next higher groups or blocks. In this case the channel numbers are to be replaced by the group numbers.  H` HH X  x|@  6'6'StandardC6QMS $=R6'6'StandardC6QMS $=R- Ntt  ` `  <  <AP IX32E NNtt  ` `  <  <AP IX32E N|(3149) |%g(3149)  `    5.HDesignations of international groups, supergroups etc. (bidirectional  and unidirectional) 5.1HGeneral HThe format of the designation of groups etc. is:   Format of  Town A/Transmission Town B/Transmission Function Serial  designation  station station code number    suffix suffix       (optional) (optional)      signs  slash hyphen slash space no space      number of  < 12 1 < 3 1 < 12 1 < 3 1 16 23  characters     Traffic relation HGroups etc. are indicated by the names of the towns where the groups etc. terminate. For the spelling see 1.1. The town names are arranged in alphabetical order. For multiple destination unidirectional groups the name of town B is replaced by (MU) (ref. 5.3.1). HIf the case that a town name exceeds the maximum length of 12 characters, the responsible administration should supply a suitable abbreviation that must be unique. HTransmission station suffix (maximum 3 characters) is an optional field which may be used to further identify the terminal point when there is more than one carrier operating in the town. The necessity for a suffix and its form should be decided by the administration operating the circuit in the town concerned. Function code HThis code consists of the nominal number of channels in the group 1). In the case of an unidirectional single destination group the number is preceded by (U) (ref. 5.3.2). Note 1 Where group, supergroup, etc., links are directly interfaced by analogue to digital conversion equipment, the number of channels is followed by the letter "C" (ref. 10). Serial numbering HThis is on a towntotown basis with an exception for the case when the suffix is used. Then the numbering is on a transmission station to transmission station basis.  N*%ԌHThe numbering of a group, supergroup, etc., is applied between the point where it is assembled to the point where it is broken down, independently of the position it occupies in the band of line frequencies. HIf the number is < 10, it is preceded by a zero. 5.2HBidirectional groups etc. 5.2.1HGroup2 HFunction code is a number that indicates the nominal number of channels in the group, as follows: H8 for 8 channel groups. H12 for 12 channel groups. H16 for 16 channel groups. Example: HThe third 12 channel group between Moskva and New York is designated: HMoskvaNew York 1203. 5.2.2HSupergroups2 HFunction code is a number that indicates the nominal number of channels in the supergroup as follows: H60 for 60 channel supergroups. H80 for 80 channel supergroups. Example: HThe first supergroup between London and Amsterdam is designated: HAmsterdamLondon 6001. 5.2.3H"Mastergroups"2 HFunction code is: 300. Example: HThe first mastergroup between Bruxelles and London is designated: HBruxellesLondon 30001. 5.2.4H"Supermastergroups"2 HFunction code is: 900 Example: HThe tenth supergroup between Amsterdam and Paris is designated: HAmsterdamParis 90010. Note 2 For the definitions see Recommendation M.300.  N*&Ԍ5.2.5HUse of the groups etc. HThis information will be contained in related information under item 9 "Use" (ref. 7.9). If groups are used for private purpose see 3.2.13. 5.2.6HRestoration groups and supergroups HSerial numbering for groups and supergroups set upon restoration or spare groups and supergroups for restoration purposes are numbered by numbers taken from the 800Series in descending order and starting from the highest value (899): HRestoration groups8899, 8898, 8897, etc., H  12899, 12898, 12897, etc., H  or16899, 16898, 16897, etc., H  as appropriate. HRestoration supergroups60899, 60898, 60897, etc. Example 1: HThe second 12 channels restoration group between London and Sydney is designated: HLondonSydney 12898. Example 2: HThe first restoration supergroup between Amsterdam and Bruxelles is designated: HAmsterdamBruxelles 60899. 5.3HUnidirectional groups and supergroups 5.3.1HMultiple destination unidirectional groups and supergroups Format: HThe unidirectional route will be designated by the name of the sending terminal station (in the general format: town A) followed by a hyphen whilst the letters MU (Multiple destination Unidirectional) in parentheses replace town B. This will be followed by the function code and serial number of the group or supergroup. Examples: HThe first multiple destination unidirectional supergroup from London to for example Bogota, Lusaka and Montreal, is designated: HLondon(MU) 6001. HThe next such supergroup from the same point of origin to whatever destinations would take the next number in the series: for example, the second supergroup from London is designated: HLondon(MU) 6002. Hbut might go, for example, to Tokyo, Hawaii and Melbourne. N*'Ԍ HThe first supergroup from Montreal to for example London, Lusaka and Paris is designed: HMontreal(MU) 6001. Note Groups and supergroups routed via a multipleaccess system may be provided for exclusive use between two terminal stations only, in which case the normal designations given above in this Recommendation will apply. 5.3.2HSingle destination unidirectional groups and supergroups Format: HThe unidirectional route will be designated by the name of the sending terminal station (in the general format: town A) followed by a hyphen and the name of the receiving terminal station (town B). The function code consists of the letter U (Unidirectional) in parentheses and the nominal number of channels of the group or supergroup. Example: HA unidirectional group transmitting in the direction from Paris to Etam, which, in the reverse direction of transmission is assigned to a multiple destination unidirectional (MU) group from Etam to Paris and Rio de Janeiro, would be designated as: HParisEtam (U) 1201. HThe next group between these locations, Paris and Etam, if bidirectional, would be designated in the normal manner as: HEtamParis 1202. Note Groups and supergroups routed via a multipleaccess system may be provided on a bidirectional basis for exclusive use between two terminal stations only, and in this case the normal designations given above in this Recommendation will apply. 5.4HRelated information HThe additional information on groups etc., is covered by the following items: H1)  Urgency for restoration; H2)  Terminal countries; H3)  Carriers' names; H4)  Control and subcontrol station(s); H5)  Fault report points; H6)  Routing; H7)  Association; H8)  Equipment information; H9)  Use; H10)  Transmission medium information; H11)  (Empty item, use: ";"); H12)  Bandwidth; H13)  Occupancy; HThe various items will be dealt with in section 7 "Related informations for N*( international groups and group and line links". 6.HDesignations of international group links, supergroup links Hand line links 6.1HGroup and supergroup links HGroup links and supergroup links are designated according to the general format for groups (ref. 5.1). In practice it may be that terminal equipment is not connected to a group link or supergroup link. Nevertheless, for designation purposes, the link will be numbered as though terminal equipment were connected. 6.1.1HConventional links not connected to their terminal equipment HSuch links are included in the normal numbering sequence of groups and supergroups and are not given a separate numbering sequence. HWhen a group link or supergroup link is used only part time with terminal translating equipment (to provide a conventional group or supergroup) it will be designated in the normal way. The part time condition of the group link has to be indicated under related information under item 9 "Use" (ref.4.9). Example: HThe group link between Amsterdam and London set up after five existing groups is designated: HAmsterdamLondon 1206. 6.1.2HRestoration links HGroup links and supergroup links nominated for restoration purposes will receive a serial number from the 800Series in ascending order and starting from 801. HRestoration group links: 12801, 12802, 12803, etc., HRestoration supergroup links: 60801, 60802, 60803, etc. Example: HThe second restoration group link between Hong Kong and Sydney is designated: HHong KongSydney 12802.  h Note The first two digits 12 in the designation of a restoration group link do not necessarily indicate the number of channels in the group which is set up via the link. For example, a restoration group link LondonMontreal 12801 might be used to restore the group LondonMontreal 1605. 6.2HLine links (see definition in Recommendation M.300,  1) HFormat of designations of line links:   Format of Town A/Transmission Town B/TransmissionFunctionSerial  N*)Ԍ designation  station station Code Number    suffix suffix       (Optional) (Optional)      signs  slash hyphen slash space no space      number of  < 12 1 < 3 1 < 12 1 < 3 1 35 2  characters     Traffic relation HThe two terminals are arranged in alphabetical order. For the use of the suffix ref. 5.1. Function code HThis code consists of a number indicating the nominal telephone channel transmission capacity followed by the letter A. Serial number HThis is a twodigit number. Example 1: HThe first 1840 telephone channels capacity line link between Beaver Harbour and Widemouth is designated: HBeaver HarboWidemouth 1840A01. Example 2: HThe first 432 telephone channels capacity line link between Etam and PleumeurBodou is designated: HEtamPleumeurBod 432A01. Note Line links are sometimes characterized by having channel capacities not in accordance with normal group, supergroup, etc., alignments. Examples of these nonstandard capacities may often be found in submarine cable or satellite line links. These links will be numbered in accordance with the nominal channel capacity of the link. 6.3HRelated information HThe additional information on group links, supergroup links and line links is covered by the following items: HHX HH1)  Urgency for restoration;p& H2)  Terminal countries; H3)  Carriers' names; H4)  Control and subcontrol station(s); H5)  Fault report points; H6)  Routing; N**ԌH7)  Association; H8)  Equipment information; H9)  Use; H10)  Transmission medium information; H11)  (Empty item, use: ";"); H12)  Bandwidth; H13)  Occupancy (this item is not in use for group links and C@@@supergroups links). HThe various items will be dealt with in section 7. "Related information for international groups, group links and line links". 7.HRelated information for international groups, group links Hand line links 7.1HUrgency for restoration HThis item supplies information on the urgency of restoration of the group/group link based upon bilateral agreement between the terminal administrations. Format: H1.  xxx .... xx; (maximum 10 characters) Illustration: Ha)  if the priority is top : 1p& H if the priority is second: 2 H if the priority is third : 3 or Hb)  if repair is required within e.g., 24 hours: < 24 hp& Hc)  if no urgency has to be indicated: FSp& Example: HIf the group BonnParis 1201 needs top priority restoration: 1.1; 7.2HTerminal countries HThis item presents the countries in which the group/group link is terminating. Format: H2.  xxx, yyy; or xxx; (3 characters for each) Specification: Hxxx code for country of town A Hyyy code for country of town B HIn the case of multiple destination unidirectional group (MU) only xxx applies. N*+Ԍ Example: HFor the group BeogradRome 1201: H2.  YUG, ITA; HFor the multiple destination group Toronto(MU) 1202 H2.  CAN; Remark: HThe codes are according to ISO standard 3166 "Specification for codes for the representation of names of countries." 7.3HNames of administrations, carriers or broadcasting companies HThis item records the names of the carriers which operate the group/group link. Format: H3.  xxxxxx, yyyyyy; or xxxxxx; (maximum 6 characters for each)p& Specification: Hxxxxxx: name of company in town A Hyyyyyy: name of company in town B HIn the case of an unidirectional multiple destination only xxxxx applies. Example: HFor for the supergroup AmsterdamLondon 6002: H3.  NLDPTT, BTI;p& HFor the multiple destination group Hong Kong(MU) 1201: H3.  HGKTEL; 7.4HControl station (subcontrol station(s)) HThis item lists the appointed control station and subcontrol stations (according to Recommendations M.80 and M.90). HFurther details about the stations can be found in the List of Contact Point (Recommendation M.93). Format: H4.  CS: designation of control station, H SCS1: designation of subcontrol station, H SCS2: designation of subcontrol station, N*,Ԍ H . . . H . . . H . . . H SCSn: designation of subcontrol station; Hor in the case of a multiple destination unidirectional group: H4.  CS: designation of control station; Specification: H CS: designation of the control station; H SCS1: designation of the terminal station which has subcontrol K!GG!GG!Gstation responsibility; H SCS2: if applicable: other subcontrol station; H SCS5 etc., are to be placed in the geographical order according L "HH "HH "H to the traffic relation. HIn the case of a multiple destination unidirectional group only CS applies. HExample for a group HelsinkiParis 1201 where the control station is Helsinki TM1 and the subcontrol station is Paris Archives: H4.  CS:Helsinki/TM1, H SCS1:Paris/ARC; HExample for the multiple destination unidirectional group Wien(MU) 1201: H4.  CS: Wien/ARS; 7.5HFault report points HThis item presents the names of both fault report points on the group/group link (according to Recommendation M.130). Further details about the fault report points can be found in the List of Contact Points (RecommendationM.93). Format: H5.  Designation of fault report point, Designation of fault report point; or H5.  Designation of fault report point; Specification: HThe first fault report point is the one of the country of town A. The second is that of the country of town B. In the case of a multiple destination unidirectional group there is only one fault report point under item 5. N*-Ԍ Example: HFor the group MoskvaParis 1201; H5.  Moskva/MNA, Paris/ARC; HFor the multiple destination unidirectional group Caracas(MU) 1201: H5.  Caracas/TS1; 7.6HRouting HThis item records the next higher group within the multiplex hierarchy on which the group/group link has been routed + position number, or in the case of the highest multiplex level the transmission media on which the group/group link has been routed. Format: H6.  Designation of an international group/position number or designation of transmission medium,p& H Designation of an international group/position number or designation of transmission medium,p& H ........................................................p& H .................................., H Designation of an international group/position number or designation of transmission medium;p& Note Two consecutive unidirectional groups are separated by a + sign instead of a comma. Specification: HThe designation of an international group refers to the next higher level in the multiplex hierarchy. If there are more than one, the groups are noted in geographical order from town A to town B. HDesignation of the transmission medium refers to the transmission medium leaving the country of town A and to the transmission medium entering the country of town B respectively. As no CCITT designations of transmission media are provided for the time being, the terminal countries should provide designations or agree on designations. HIf there is only one transmission medium, the designation of this medium applies. Example: HA group AlgerLondon 1201 has been routed internationally as follows: H6.  AlgerParis 6002/2, LondonParis 6040/5; HA supermaster group BarcelonaPerpignan 90001 has been routed as follows:  N*.ԌH6.  GeronaPerpignan 1800A08; HA group CaracasParis 1201: H6.  CaracasParis 6001/2+ Caracas(MU) 6002/3; 7.7HAssociation HThis item identifies whether there are associated group/group links and if so, of which nature. Format: H7.  Association code: designation(s) of the associated group(s) or group link(s); Specification: HIf the group has a reserve group the association code is: HS followed by the function code and the serial number of the group. HIf the group is a reserve group the association code is: HFunction code followed by S and the serial number of the reserve group. HThe above applies for group links in the same way. Examples: HIf the normal group is BruxellesLuxembourg 1215 and if the group BruxellesLuxembourg 12899 serves as a restoration group for the group BruxellesLuxembourg 1215: H7.  S1215: BruxellesLuxembourg 12899; HFor the group BruxellesLuxembourg 12899 there has to be recorded under item 7: H12S899: BruxellesLuxembourg 1215; 7.8HEquipment information HThis item records information on equipment in the group/group link which requires special maintenance attention. Format: H8.  xx, xx, xx, xx; Specification: HIf the group is carrying companded circuits: CO HIf a group has been routed via TDMA: TD HIf there is no special equipment: Note If there is a need to record any additional equipment information, the free codeplaces are available for that purpose. The codes to be used must consist of two N*/ characters, have to be unique and can be chosen by bilateral agreement between administrations. Example: HIf a group GenevaMexico 1210 is carrying companded circuits: H8.  CO; 7.9HUse HThis item identifies for what purpose the group/group link is used (if this is known by the administration and of use for maintenance). Format: H9.  xxxxxx (maximum of 6 characters). Specification: Hxxxxxx refers to among others the designatory letters Z, B, D, X, DP, RP, VP etc., as explained in chapters 1 and 3. If no other information is available the sign: Example: HIf the group LondonMelbourne 1212 is dedicated to DPcircuits: H9.  DP; 7.10HTransmission medium information HThis item identifies whether a satellite is involved in the routing. Format: H10.  ST; or ; Specification: HIf the group/group link has been routed via satellite: ST; HIf the group/group link has not been routed via satellite: Example: HIf the group CaracasMadrid 1203 has been routed via satellite: H10.  ST; 7.11HEndtoend information (for mixed analogue/digital routes only) HThis item provides information on the destinations of the traffic carried by the group. Format: H11.  x......x, y......y; (maximum 12 characters each) or ;  N*0ԌSpecification: Hxx..x and y......y are the names of a town and refer to the extremities of the routes. HThe extremities are placed according to the order of towns in the traffic relation. HIf the group has a multiple destination one town name is replaced by the code: M. HIf the group is within analogue environment x..x, y..y is replaced by the sign "". Example: HIf the group AthinaiParis 60C11 carriers traffic from Bruxelles to Sofia: H11.  Sofia, Bruxelles; 7.12HBandwidth HThis item shows the bandwidth of the group/group link. Format: H6.  xxxx kHz or MHz of GHz (no leading zero's required). HRule for the notation of the figures HIf the bandwidth figure is between 10 000 and 9 999 999, use kHz. If it is between 10 000 000 and 9 999 999 999, use MHz. If it is higher, use GHz. Example: HA group BangkokNew Delhi 1201: H12.  48 kHz; 7.13HOccupancy (for groups/supergroups etc., and for line links) HThis item lists the occupancy of the group expressed by the next lower group and/or circuits which have been routed in the group. Format in the case of a group (lowest level): H13.  Position number: designation of the circuit, or the sign , H " " " " " " " " " ", H " " " " " " " " " ", H " " " " " " " " " ", H " " " " " " " " " ", H " " " " " " " " " "; Format in the case of a supergroup or higher level group: 13. Position number: designation of a group, of a leased circuit or the sign , " " " " " " " " " " ", " " " " " " " " " " ", N*1Ԍ " " " " " " " " " " ", " " " " " " " " " " ", " " " " " " " " " " ", " " " " " " " " " " "; Specification: HIf the position number is occupied by a next lower group: designation of this group. If the position number is occupied by a leased circuit (with a bandwidth corresponding to the bandwidth of the next lower multiplex level e.g., ref. 3.2.13); designation of this leased circuit. If the position number is not in use: Example: HFor a supergroup AthinaiParis 6002: H13.  01: BeyrouthParis 1209, H 02: LondonSofia 1202, H 03: AthinaiParis 1205, H 04: AthinaiRotterdam 1202, H 05: AthinaiParis DP4; A.HFull example for the designation information of an international group Note The numbers between parentheses refer to the numbers of the items in the related information. HIt is the fifth group between Amsterdam and Paris. The urgency for restoration (1) is third priority, the terminal countries (2) are The Netherlands and France, the administrations involved (3) are The Netherlands PTT and France Telecom, the control station and subcontrol station (4) are Paris Archives and Amsterdam 1 respectively, the fault report points (5) are Amsterdam 2 and Paris Archives, routing (6) of the group is in the supergroup Amsterdam Bruxelles 6011 on position 1 and in the supergroup BruxellesParis 6002 on position 3, there is an associated group (7) carrying traffic but indicated for restoration namely AmsterdamParis 1209, there is special equipment involved (8) because the group is carrying companded circuits the use (9) is: Zcircuits and a DP circuit, no satellite (10) is involved, no endtoend information (11) is to be recorded, the bandwidth (12) is 48 kHz and the occupancy (13) is to be seen from the example. The designations: HAmsterdamParis 1205 Related information H1)  3; H2)  NLD, FRA; H3)  NLDPTT, FRATEL; H4)  CS: Paris/ARC, SCS1: Amsterdam/1; H5)  Amsterdam/2, Paris/ARC; H6)  AmsterdamBruxelles 6011/1, H BruxellesParis 6002/3; H7)  S1205: AmsterdamParis 1209; H8)  CO; H9)  Z, DP; H10)  ; H11)  ; N*2ԌH12)  48 kHz; H13)  01: AmsterdamParis Z111, H 02: AmsterdamParis Z113, H 03: Amsterdam Paris Z115, H 04: AmsterdamParis Z117, H 05: AmsterdamParis Z119, H 06: AmsterdamParis Z121, H 07: ParisAmsterdam Z120, H 08: ParisAmsterdam Z122, H 09: ParisAmsterdam Z124, H 10: ParisAmsterdam Z126, H 11: ParisAmsterdam Z128, H 12: AmsterdamParis DP5. B.HFull example for the designation information of an international Hgroup link Note The numbers between parentheses refer to the numbers of the items in the related information. HIt is the first restoration group link between Paris and Geneva. The urgency for restoration (1) is third priority, the terminal countries (2) are Switzerland and France, the administrations (3) are Swiss PTT and France Telecom, the control and subcontrol station (4) are Geneva Monthoux and Paris Archives respectively, the fault report points (5) are the same stations, the routing (6) is in the second supergroup between Geneva and Annemasse on position 1, there is no information to be recorded about association (7), special equipment (8), the use (9), there is no satellite involved (10), no endtoend information (11) is required, the bandwidth (12) is 48 kHz. The designations: HGenevaParis 12801. Related information H1)  3; H2)  CHE, FRA; H3)  CHEPTT, FRATEL; H4)  CS: Geneva/MON, SCS: Paris/ARC; H5)  Geneva/MON, Paris/ARC; H6)  AnnemasseGeneva 6002/1; H7)  ; H8)  ; H9)  ; H10)  ; H11)  ; H12)  48 kHz; 8.HDesignations of international digital blocks (bidirectional and GCunidirectional) 8.1HGeneral HThis section refers to blocks which are part of the digital multiplex hierarchy and which are formatted according to Recommendations G.734, G.736, G.742, G.743, G.745, G.751, G.752, G.753 and G.754. All other blocks are designated according to section 11. N*3Ԍ HFormat of designation of digital blocks: 8   8 Format of Town A/Suffix for Town B/Suffix for FunctionSerial  8 designation TransmissionTransmissionCodeNumber  8  station orstation or  8  InternationalInternational  8  exchangeexchange  8  (Optional)(Optional)  8 8    8 signs slashhyphenslash spaceno space  8 8    8 number of < 12 1 < 3 1 < 12 1 < 3 1 35 < 4  8 characters   8   Traffic relation HTown A and town B possibly with a suffix for transmission station or international exchange indicate the terminal points of the block. For the spelling see 1.1. If a town name exceeds the maximum length of 12 characters, the administrations should supply a suitable abbreviation which must be unique. The town names are arranged in alphabetical order. HThe suffix for transmission station or international exchange (maximum 3 characters) is an optional field which may be used to further identify the terminal point when there is more than one carrier operating in the town. The necessity for a suffix and its form should be decided by the administration operating the circuit in the town concerned. HIn the case of a multiple destination unidirectional block, town B is replaced by (MU) (ref. 8.3). Function code HThis code consists of a number indicating the nominal number of channels in the block followed by the letter N. HFor blocks in a mixed analogue/digital environment see 10.1.2. Then <Ġ6characters are required. Serial number HThis is a 14 digit number counting the number of blocks with the same traffic relation and the same function code. 8.2HBidirectional digital blocks HThese blocks are designated according to the principles stated above (ref. 8.1). Example 1: HThe fourth secondary order block between London and Paris is designated: N*4Ԍ HLondonParis 120N4. Example 2: HThe tenth primary order block between New York and Tokyo is designated: H HNew YorkTokyo 24N10. 8.3HRestoration digital blocks HDigital blocks set up on restoration digital paths or spare digital paths for restoration purposes are indicated by serial numbers taken from the 800Series. The serial numbering starts at 899 and blocks are numbered in descending order. Example: HThe first fourth order restoration block between Koebenhavn and Stockholm is designated: HKoebenhavnStockholm 1920N899. 8.4HMultiple destination unidirectional digital blocks HFor these blocks the traffic relation is composed of the name of the sending terminal station followed by a hyphen and the letters MU (Multiple destination Unidirectional) in parentheses. Examples: HThe first multiple destination unidirectional primary digital block from Bercenay (to, for example, London and Bruxelles) is designated: HBercenay(MU) 30N1. HThe next multiple destination unidirectional primary digital block from Bercenay (to, for example, Frankfurt and Rome) is designated: HBercenay(MU) 30N2. Note Digital blocks routed via a multiaccess system may be provided for exclusive use between two terminal stations only in which case the normal designations given above in this Recommendation will apply. 8.5HSingle destination unidirectional digital blocks HThese are designated as normal digital blocks and numbered in the same sequence. The unidirectional property as well as the direction of transmission has to be registered under related information under item 16 "Direction of transmission" (ref. 12.16). Example: HAn unidirectional primary digital block transmitting in the direction Roma to London being the twenthfirst primary digital blocks on that relation is designated: HLondonRoma 30N21.  N*5Ԍ8.6HRelated Information HThe additional information on digital blocks is covered by the following items: H1)  Urgency for restoration; H2)  Terminal countries; H3)  Carriers' names; H4)  Control and subcontrol station(s); H5)  Fault report points; H6)  Routing; H7)  Association; H8)  Equipment information; H9)  Use; H10)  Transmission medium information; H11)  (Empty item, use ); H12)  Bit rate; H13)  Occupancy; H14)  Actual number of channels (for primary blocks only); H15)  Clocking information; H16)  Direction of transmission (for unidirectional blocks only). HThe various items will be dealt with in section 12 "Related information for international digital blocks, paths and data transmission systems". 9.HDesignations of international digital paths HIn practice it may be that terminal equipment is not connected to a digital path. Nevertheless, for designation purposes the digital path will be designated as though digital blocks had been set up (ref. 8.1). 9.1HConventional digital paths not connected to their terminal equipment HSuch digital paths are included in the normal serial numbering sequence of digital blocks and are not given a separate numbering sequence. 9.2HRestoration digital paths HDigital paths nominated for restoration purposes are designated by serial numbers taken from the 800Series. The serial numbering starts at 801 and paths are numbered in ascending order. HRestoration paths for first order digital blocks: 30N801, 30N802 etc. HRestoration paths for second order digital blocks: 120N801, 120N802, etc. Example 1: HThe fourth second order restoration digital path between London and Paris is designated: HLondonParis 120N804. Example 2: HThe first third order restoration digital path between Amsterdam and Paris is designated:  N*6ԌHAmsterdamParis 480N801. 9.3HDigital transmission systems HDesignations of digital line sections and digital radio sections are under consideration. 9.4HRelated information HThe additional information on digital paths is covered by the following items: H1)  Urgency for restoration;p& H2)  Terminal countries;p& H3)  Carriers' names;p& H4)  Control and subcontrol station(s);p& H5)  Fault report points;p& H6)  Routing;p& H7)  Association;p& H8)  Equipment information;p& H9)  Use;p& H10)  Transmission medium information;p& H11)  (Empty item, use );p& H12)  Bit rate;p& HThe various items will be dealt with in section 12 "Related information for international digital blocks, paths and data transmission systems". 10.HDesignations of routes in the mixed analogue/digital transmission I Enetwork HTo be in accordance with the philosophy for liningup and maintaining a mixed analogue/digital transmission network (Recommendation M.20), the analogue and digital parts of the network are designated separately. To indicate that the endtoend transmission relies on a mixture of analogue and digital transmission systems, the letter C is included in both the analogue and digital designations. HTransmultiplexer equipment is included in the designation of the analogue part of the route. 10.1HTransmission routes 5) with one analoguetodigital conversion 10.1.1HGroups and supergroups etc., forming part of a mixed Hanalogue/digital transmission route HGroups, supergroups, etc., which are converted into digital paths at some point are designated in the same way as conventional groups or supergroups (ref. 5.1) but have a letter C included in the function code and placed after the nominal number of channels. Examples: HGroup : LondonRiyadh 12C02 H  AmsterdamKoebenhavn 12C899 H  (restoration group) HSupergroup : ParisSydney 60C01 HMastergroup : BrusselsLondon 300C03 HSupermastergroup: AmsterdamParis 900C04 HFigure 1/M.140 shows a typical analogue/digital arrangement and how it will be N*7 designated. 10.1.2HDigital blocks and paths forming part of a mixed Hanalogue/digital transmission route HDigital blocks and paths which are converted into analogue groups, supergroups, etc., at some point are designated in the same way as conventional digital blocks and paths but have an additional letter C placed after the letter N. Example: HMadridRoma 480NC1. HFigure 1/M.140 shows a typical analogue/digital arrangement and how it will be designated. 10.1.3HEndtoend designations HThis subject is covered by item 11 in layer 2 for digital blocks (ref.12.11). Note 5 This term is used provisionally in this context to designate various combination of analogue and digital sections with appropriate intermediate equipment and usually also including terminal equipment, as illustrated in Figure 1/M.140 and Figure 2/M.140. 10.2HTransmission routes with two analoguetodigital conversions 10.2.1HEndtoend designations HWhere both ends of a route involving two analoguetodigital conversions are analogue an endtoend designation, using the analogue notation described in  10.1.1, should be agreed between the terminal administration. HWhere both ends are digital, and endtoend designation using the digital notation described in  10.1.2, should be agreed between the terminal administrations. HBy the above means both terminal stations have available a common designation for the endtoend transmission route, and are informed of its mixed analogue/digital nature. 10.2.2HIntemediate section designation HThe intermediate part of the route is given a separate designation using the appropriate notation. The choice of this designation is the responsibility of the administrations providing the intermediate part of the route, and it is their responsibility to associate, in their records, this intermediate designation with the overall designation. HFigure 2/M.140 shows two examples of routes involving two analogueto digital conversions and how they will be designated. 10.3HTransmission routes with more than two analoguetodigital conversions HThe transmission planning rules given in Recommendation G.113  3 |2| effectively restrict the number of unintegrated digital processes (e.g., analoguetodigital conversions) permitted in the international part of a telephone connection.0||: ccitt\apix\doc\32e3.txs 0/|}|ccitt\apix\doc\32e3.txs / HSimilarly, the routing plan given in Recommendation E.171 |3| restricts the )8 number of international circuits in a connection to four. In view of these rules it is desirable to limit the number of analoguetodigital conversions in each direction between international centres to a maximum of two. Therefore the detailed designation requirements of routes with more than two analogueto digital conversions are not considered. 10.4HRelated information HThe additional information on groups and blocks in the mixed analogue/digital network is covered by the same items as analogue groups and digital blocks respectively. However the item 11 "Endtoend information" is used in addition (ref. 7.11 and 12.11).  h` HH   x|@  6'6'StandardC6QMS $=R6'6'StandardC6QMS $=R- btzt  ` `  <  <AP IX32E < < bbt{t  ` `  <  <AP IX32E < < b:f (3149) |f (3149)  X 11.HDesignation of data transmission systems (note 1) 11.1 HGeneral  `  HThis section deals with data transmission systems provided between the premises of administrations. (Those between renters' premises are designated according to section3.2.15 digital leased circuits.) HThe designation scheme of these data transmission systems can only be used if they are nonhierarchical or not formatted according to the RecommendationsG.734, 736, 742, 743, 745, 751, 752, 753 and 754. This means that digital blocks from a digital multiplex hierarchy, with a format defined in RecommendationG.702 cannot have a designation taken from this section. They should be designated according to section8. Note 1 This section deals with digital transmission only. Analogue data transmission systems and links are covered by circuits, groups and group links. HFormat of designations of data transmission systems:    Format of  Town A/Suffix for Town B/Suffix for Function Serial   designation  transmission transmission code number    station or station or    international international    exchange exchange    (Optional) (Optional)    Signs  Slash Hyphen Slash Space No Space    Number   12 1  3 1  12 1 < 3 1  5 13  characters     Traffic relation: HTown A and Town B possibly with a transmission station or international exchange suffix represent the two terminal stations of the data transmission system. HThe names are arranged in alphabetical order. For the spelling see1.1. If the town name exceeds the maximum length of 12 characters the responsible administration should supply a suitable abbreviation which must be unique. N*9Ԍ HTransmission station or international exchange suffix (maximum 3characters) is an optional field which may be used to further identify the terminal point when there is more than one carrier operating in the town. The necessity for a suffix and its form should be decided by the administration operating the circuit in the town concerned. Function code: HThis code consists of a two to four digit number which together with a letter which shows the multiplication factor, indicates the bit rate in bit/s. HThe letters to be used to indicate the multiplication factor are: HBit rate of system letter HUp to 999 bit/s B H 1 000 to 9 999 bit/s H H10 000 to 9 999 999 bit/s K H10 000 000 to 9 999 999 999 bit/s M Serial number: HThis is a one to three digit number counting the number of data transmission systems with the same traffic relation and the same function code.  h Note The use of the data transmission system (e.g. multiplex of digital leased circuits, broadcasting, video) will be recorded in (Related Information under item9 (ref 12.9). Example: HThe first 9600 bit/s data transmission system between Lisboa and NewYork (for example in use for a multiplex of 2400bit/s and 7200bit/s circuits): HLisboaNew York 96H1. HThe eleventh 2048kbit/s data transmission system between London and Paris (used, for example, for public video conference): HLondon Paris 2048K11. 11.2HData transmission links HData transmission links are designated as data transmission systems. 11.3HRelated information HThe additional information on data transmission systems is covered by the following items: H1.  Urgency for restoration; H2.  Terminal countries; H3.  Carriers' names; H4.  Control and subcontrol station(s); H5.  Fault report points; H6.  Routing; H7.  Association; N*:ԌH8.  Equipment information; H9.  Use; H10.  Transmission medium information; H11.  Composition of transmission; H12.  (Empty item, use: ); H13.  Occupancy. HVarious items will be dealt with in Chapter12 "Related information for international digital blocks, paths and data transmission systems". 12.HHRelated information for international digital blocks, paths and data transmission systemsp&H 12.1HUrgency for restoration HThis item supplies information on the urgency of restoration of the block, path etc., based upon bilateral agreement between the terminal administration. Format: H1.  xx ... xx; (maximum 10 characters) Illustration: Ha)  If the priority is top: 1 H If the priority is second: 2 H If the priority is third: 3 Hb)  If repair is required within e.g. 24 hours:  24h Hc)  If no urgency has to be indicated: Example: HIf a block needs top priority in the case of restoration: 1.1 12.2HTerminal countries HThis item presents the countries in which the block, path or data transmission system is terminating. Format: H2.  xxx, yyy; (3 characters for each) or 2. xxx; Specification: Hxxx: code for country of town A Hyyy: code for country of town B HIn the case of multiple destination unidirectional block only xxx applies. Remark: HThe codes are according to ISO Standard 3166 "Specification for codes for the representation of names of countries". Example: HFor a digital block BruxellesFrankfurt 120N1: N*;Ԍ H2.  BEL, DEU; 12.3HNames for administration, carriers or broadcasting companies HThis item records the names of the carriers which operate the block, path etc.; Format: H3.  xxxxxx, yyyyyy; (maximum 6 characters for each) or 3. xxxxxx; Specification: Hxxxxxx: name of company in town A Hyyyyyy: name of company in town B HIn the case of multiplex destination undirectional block only xxxxxx applies. Example: HFor a digital block FrankfurtLondon 30N1 operated by British Telecom International and Deutsche Bundespost: H3.  DBP, BTI; 12.4HControl station (subcontrol station(s)) HThis item lists the appointed control station and subcontrol stations (according to Recommendations M80 and M90). Further details about the stations can be found in the List of Contact Points (RecommendationM.93). Format: H4.  CS:designation of control station; H SCS1:designation of subcontrol station; H SCS2:designation of subcontrol station; H . . . . . . . . . H SCSn:designation of subcontrol station; or in the case of a multiple destination unidirectional block: H4.  CS:designation of control station; Specification: H CS: designation of the control station; H SCS1: designation of the terminal station which has subcontrol station responsibility; H SCS2: if applicable: next subcontrol station. HSCSn etc., are to be placed in the geographical order according to the traffic relation. In the case of a multiple destination unidirectional block only CS applies. Example 1:  N*<ԌHFor the digital block StockholmVenezia 30N1 with control station Stockholm and subcontrol stations Venezia and Paris: H4.  CS: Stockholm/HAM; H SCS1: Venezia/CEN; H SCS2: Paris/ARC. Example 2: HFor the digital block Rio De Janeiro(MU) 30N1: H4.  CS: Rio de Janei/1; 12.5HFault report points HThis item presents the names of both fault report points on the block, path etc., (according to RecommendationM.130). Further details about the fault report points can be found in the List of Contact Points (RecommendationM.93). Format: H5.  Designation of fault report point, designation of fault report point;p& or H5.  Designation of fault report point; Specification: HThe first fault report point is the one of country of town A. The second fault report point is the one of country of town B. In the case of a multiple destination undirectional block the second station and the comma are omitted. Example 1: HFor the digital block LisboaZuerich 30N1: H5.  Lisboa/MAR, Zuerich/SEL. Example 2: HFor the digital block Jakarta(MU) 30N1: H5.  Jakarta/1. 12.6HRouting HThis item records the next higher block within the multiplex hierarchy on which the block path, data transmission system, has been routed+position number, or in the case of the highest multiplex level the transmission media on which the block has been routed. Format: H6.  Designation of an international block/position number or designation of transmission medium,p& H designation of an international block/position number or designation of transmission medium,p& N*=ԌH ...........................; or ...............................p& HHX ...........................,p&  h H designation of an international block/position number or designation of transmission medium;   X Note two consecutive unidirectional blocks are separated by a + sign instead of a comma. Specification: HThe designation of an international block refers to the next higher level in the digital multiplex hierarchy. If there are more than one, the blocks are noted in geographical order from townA to townB. Designation of the transmission medium refers to the transmission medium leaving the country of townA and to the transmission medium entering the country of townB respectively. As no CCITT designation of transmission media nor digital line or radio sections are provided for the time being, the terminal countries should provide or agree on designations. HIf there is only one transmission medium: the designation of this medium applies. Example 1: HFor the primary digital block FrankfurtZuerich 30N7: H6.  FrankfurtZuerich 120N1/3. Example 2: HFor the block BruxellesLondon 1920N1: H6.  UKB 5. 12.7HAssociation HThis item identifies whether there are associated blocks, paths, data transmission systems and if so, of which nature. Format: H7.  Association code: designation of the associated block, paths ƀ% H  etc., or blocks paths etc. Specification: HIf the block has a reserve block the association code is: S followed by the function code and the serial number of the principal block. HIf the block is a reserve block: the association code is: Funtion code followed by S and the serial number of the reserve block. HThe same applies for digital paths and data transmission systems. Example: HIf the path HongkongSingapore30N801 is the restoration path for the normal block HongkongSingapore30N3, the related information for the normal block under association must show: N*>Ԍ H7.  S30N3: HongkongSingapore 30N801. 12.8HEquipment information Ha)  This item records information on equipment in the block, path etc., which requires special maintenance attention. Format: H8.  xx, xx, xx, xx Specification: HIf the block has been routed via TDMA: TD. HIf there is a need to record any additional equipment information, the next free codeplaces are available for that purpose. The codes to be used must consist of two characters, have to be unique and can be chosen by bilateral agreement between administrations. Hb)  For data transmission systems this item supplies information about the multiplex configuration. Format for data transmission systems only: H8.  xyyyyzzzzz Specification: Hx refers to the Recommendation series Hyyyy  refers to the Recommendation number Hz...z  refers to the section, paragraph, table etc., number. Example: HFor a 9600 bit/s data transmission system with a multiplex configuration as defined in RecommendationM.1320 TableA1 item8 will present: H8.  M1320TA1. 12.9HUse HThis item identifies for what purpose the block, path, data transmission system is used (if this is known by the administration and of use for maintenance). Format: H9.  xxxxxx; (maximum 6 characters) Specification: Hxxxxxx refers to among others the designatory letters Z, B, D, V etc., to indicate the use of the block. If no information is available: Example: HIf the digital block FrankfurtLuxembourg30N1 is used for soundprogramme N*? transmission: H9.  R; 12.10HTransmission medium information HThis item identifies whether a satellite is involved in the routing. Format: H10.  ST; or ; Specification: HIf the block has been routed via satellite: ST HIf the block has not been routed via satellite: Example: HFor the block Paris(MU) 30N1: H10.  ST;  X 12.11.AHEndtoendinformation (for blocks and paths on mixed analogue/digital routes only) HThis item provides information on the destinations of the traffic carried by the block or path. Format: H11.  x....x, y........y; (maximum 12 characters each) or ; Specification: Hx....x and y....y refer to the names of the towns which form the extremities of this route. The town names are placed according to the order in the traffic relation.   HHIf the block has multiple destination the town name is replaced by"M".!H   HHIf the block is within a digital environment x..x, y..y is replaced by the sign "".%H  `  Example 1:  ` 8 HA primary digital block FrankfurtParis 30NC6 being part of a mixed route FrankfurtLondon will have under item 11: H11.  Frankfurt, London; Example 2:  8X HA primary block AmsterdamBruxelles 30NC146 being part of a mixed route LondonLuxembourg will show under this item: H11.  London, Luxembourg; 12.11.BHComposition of transmission (for data transmission systems) N*@Ԍ HThis item shows the type of transmission on the data transmission system. Format: H11.  A, N or C; Specification: HIf the transmission is analogue : A HIf the transmission is digital : N HIf the transmission analogue/digital : C 12.12HBit rate (for blocks and paths) HThis item shows the bit rate of the block or path. Format: H12.  xxxx.x kbit/s or Mbit/s; HLeading zeros and if the decimal is a zero, this decimal and the decimal sign may be omitted. HIf the bit rate is up to 9999999bit/s use kbit/s HIf it is higher use Mbit/s Note for data transmission systems use the sign: Example 1: HThe digital block New YorkTokyo 24N2 will have under this item: H12.  1544 kbit/s Example 2: HThe digital block BruxellesLuxembourg 480N1 will have under this item: H12.  34 Mbit/s; 12.13HOccupancy (for blocks and data transmission systems HThis item lists the occupancy of the block expressed by the next lower blocks and/or circuits and/or data transmission systems which have been routed in the block. Format in the case of a primary block: H(The same format applies to data transmission systems, replacing "time slot number" by "channel number" according to RecommendationM.1320.) H13.  Time slot number: designation of the circuit, or the sign , " " , " , " " , " , " " , " , " " , " , " " , " , N*AԌH Time slot number: designation of the circuit, or the sign ; Format in the case of a secondary or higher level block: 13. Position number: designation of a block, of a leased circuit or of a data transmission system or the sign , " " , " " , " " , H Position number: designation of a block, of a leased circuit or of a data transmission system or the sign ; Specification:  X HHIf the position number is occupied by a next lower digital block: designation of this block.(#H   HHIf the position number is occupied by a digital leased circuit (with a bit rate corresponding to the bit rate of the next lower multiplex level): designation of this leased circuit.%H   HHIf the position number is occupied by a data transmission system (with a bit rate corresponding to the bit rate of the next lower multiplex level): designation of this data transmission system.%H  ` HIf the position number is not in use the sign: . Example 1: HItem 13 digital of block GeneveParis 120N2 is H13.01. GeneveLisboa 30N1, H13.02. , H13.03. GeneveParis 2048K1, H13.04. BruxellesWien 30N1; Example 2: HItem 13 of digital block New YorkParis 24N5: H13.01: New York/24Paris/PT2 Z1, H 02: New York/24Paris/PT2 Z3, H 03: New York/24Paris/PT2 Z5, H 04: Paris/PT2New York/24 Z2, H 05: Paris/PT2New York/24 Z4, H 06: Paris/PT2New York/24 Z6, H 07: , H 08: , H 09: , H 10: Orlando/TS1Toulouse/FER 64K1, H 11: , H 12: , H 13: , H 14: , H 15: New York/TS1Paris/ARC R1, H 16: New York/TS1Paris/ARC R3, H 17: , H 18: , H 19: , H 20: Paris/BEAWashington/TS1 NP1, H 21: , N*BԌH 22: , H 23: , H 24: , 12.14HActual number of channels (primary blocks only)  ` H HThis item contains the actual number of channels on a primary digital block. Format: H14.  xxx; Specification: Hxxx indicates the actual number of channels. HFor highest blocks xxx is replaced by the sign . Example 1: HThe digital block New YorkParis 30N5 dedicated to leased circuits will show under this item: H14.  31; Example 2: HThe digital block LondonNew York 30N3 used for switched public telephone circuits with ADPCM may have under this item: H14.  60; Example 3: HThis digital block HonoluluOsaka 24N2 used for switched public telephone circuits: H14.  24; 12.15HClocking information (for blocks only) HThis item specifies whether administration apply a clocking system according to CCITT RecommendationG.811 or use a master/slave system. Format: H15.  xx .... xx; (maximum 30 characters) Specification: HIf clocking according to Recommendation G.811 is applied: G.811; HIf a master/slave clocking is applied: HM = xxx .... xx, S = xx .... xx; H(Town name for the master) (Town name for the slave) Example 1: N*CԌ HClocking according to Recommendation G.811: H15.  GT.811; Example 2: HClocking according to master/slave system: H15.  M = London, S = Frankfurt; 12.16HDirection of transmission (for undirectional blocks) HThis item gives information on the direction of transmission of a unidirectional digital block. Format: H16.  I; or A; Specification: HIf the block is unidirectional and if it has a single destination: H. if the direction of transmission is in the alphabetical order: A H. if the direction of transmission is in the inverse alphabetical order: I Example: HUnidirectional digital block transmitting in the direction Roma to London, LondonRoma 30N1 will have under item 16: H16.  I; A.HHFull example for the designation information of an international digital blockƐ$H Note The number between parentheses refer to the numbers of the items in the related information. HIt is the 12th primary digital block between Roma and Paris. The urgency for restoration (1) is 2, the terminal countries (2) are France and Italy, the administrations involved (3) are France Telecom and ASST, control station (4) is Roma 1 and subcontrol station is Paris Archives, the fault report points (5) are the same stations, the block has been routed (6) in the secondary digital block ParisRoma 120N2 on position number 3, it has an associated block(7) indicated for restoration ParisRoma30N5, no special equipment(8) is involved, the use of the block (9) is DP and NPcircuits, no satellite is involved (10), no endtoend information (11) is required, the bit rate (12) is 2.048Mbit/s, the occupancy (13) is to be seen in the example, the actual number of channels (14) is 31, the clocking system (15) is a master/slave system with the master in Paris and the slave in Roma. The designation: HParisRoma 30N12  N*DԌRelated information: H1.  2; H2.  FRA, ITA; H3.  FRATEL, ASST; H4.  CS: Roma/1, SCS1: Paris/ARC; H5.  Paris/ARC, Roma/1; H6.  ParisRoma 120N2/3; H7.  S30N12: ParisRoma 30N5; H8.  ; H9.  DP, NP; H10.  ; H11.  ; H12.  2048 kbit/s; H13.  01: LondonRoma DP12, H 02: ParisRoma DP2, H 03: NapoliRouen NP1, H 04: ParisRoma NP3, H 05: ParisRoma NP4, H 06: ParisRoma NP5, H 07: , H 08: , H 09: , H 10: LilleRoma DP1, H 11: ParisRoma DP5, H 12: , H 13: , H 14: , H 15: , H 16: BruxellesRoma DPM4, H 17: ParisRoma NPM1, H 18: , H 19: , H 20: , H 21: , H 22: , H 23: , H 24: , H 25: , H 26: , H 27: , H 28: , H 29: , H 30: , H 31: , H14.  31: , H15.  M = Paris, S = Roma B.HHFull example for the designation information of an international digital pathƐ$H  H Note The numbers between parentheses refer to the numbers of the items in the related information. HIt is the first restoration digital second order path between Paris and Bruxelles. The urgency for restoration (1) is 3, the terminal countries (2) are Belgium and France, the administrations involved (3) are the BelgiumRTT and N*E FranceTelecom, control station(4) is Bruxelles BLA and subcontrol station is Paris Archives, the fault report points (5) are the same stations, the path has been routed (6) in the first third order block BruxellesParis on position number1, there are no associated blocks(7), no special equipment(8), use (9) has not been indicated, no satellite is involved (10), no endtoend information(11) is required, the bit rate (12) is 8.448Mbit/s. The designation: HBruxellesParis 120N801 Related information H1.  3; H2.  BEL, FRA; H3.  BELRTT, FRATEL; H4.  CS: Bruxelles/BLA, H SCS1: Paris/ARC; H5.  Bruxelles/BLA, Paris/ARC; H6.  BruxellesParis 480N1/1; H7.  ; H8.  ; H9.  ; H10.  ; H11.  ; H12.  8448 kbit/s C.HHFull example for the designation information of an international data transmission system%H Note The numbers between parentheses refer to the numbers of the items in the related information. HIt is the first 64kbit/s data transmission system between London and Paris. The urgency for restoration (1) is 1, the terminal countries (2) are United Kindom and France, the administrations involved (3) are British Telecom International and France Telecom, the control and subcontrol station (4) are London Mollison and Paris Archives respectively, the fault report points (5) are the same stations, the system has been routed (6) in the 12th primary block between Paris and London on timeslot number 3, there is no information to be recorded about association (7), equipment information (8) and use (9), there is no satellite involved (10), composition of transmission (11) is digital. The designation: HLondonParis 64K1 Related Information: H1.  1; H2.  GBR, FRA; H3.  BTI, FRATEL; H4.  CS: London/SM, H SCS1: Paris/ARC; H5.  London/SM, Paris/ARC; H6.  LondonParis 30N12/3; H7.  ; H8.  ; N*FԌH9.  ; H10.  ; H11.  N; H12.  ; H13.  A4: LondonParis NP12, H B4: LondonToulouse NP3, H C4: , H D4: DublinParis NP6, H E4: LondonParis NP11, H F4: LondonParis NP14;  lG &Annex ( (to Recommendation M.140) ( ( ParagraphType of international route 1.2.2H  Telephone circuits used in manual operation% 1.2.3H  Telephone circuits used for semiautomatic or automatic operation% 1.2.4H  Both way telephone circuits used for semiautomatic or automatic operation% 1.3H  Circuits used for switched telex and telegraph service% 1.4H  Circuits in the international public switched data network% 3.2.2H  Analogue leased circuit used for telephony% HHX X  H3.2.3.1H Analogue circuits used for voicefrequency telegraphy% HHX X  H3.2.3.2H Analogue leased circuits used for TDMtelegraphy% 3.2.4H  Leased telegraph circuits% 3.2.5H  Analogue leased circuits used for data transmission% 3.2.6H  Analogue leased circuits used for phototelegraphy or facsimile% HHX X  H3.2.7.1H Analogue leased unidirectional soundprogramme transmission circuits% HHX X  H3.2.7.2H Analogue leased reversible soundprogramme transmission circuits% HHX X  H3.2.8.1H Analogue leased unidirectional television programme circuits% HHX X  H3.2.8.2H Analogue leased reversible television programme circuits% 3.2.9H  Leased circuits used for digital video transmission% HHX X  H3.2.10H Analogue leased circuits connection circuit multiplication terminal equipment at renters' premises% HHX X  H3.1.11H Analogue leased circuits used for a multiple kind of transmission etc.% HHX X  H3.2.12H Analogue leased circuits connecting three or more locations% HHX X  H3.2.13H Leased analogue groups, supergroups etc.% HHX X  H3.2.14H Leased analogue group, supergroup and line links% HHX X  H3.2.15H Digital leased circuits connecting two locations% HHX X  H3.2.16H Digital leased circuits connecting three or more locations% HHX X  H3.3.2.1H Public circuits used for unidirectional soundprogramme N*H transmission% HHX X  H3.3.2.2H Public circuits used for reversible soundprogramme transmission% HHX X  H3.3.2.3H Public circuits used for narrowband soundprogramme transmission% HHX X  H3.3.3.1H Public circuits used for unidirectional television transmission% HHX X  H3.3.3.2H Public circuits used for reversible television transmission% 3.3.4H  Public circuits for digital audio and video transmission% 3.3.5H  Public telephone type circuits used for phototelegraphy or facsimile % 3.3.6H  Telephone type circuits used to provide voice frequency telegraph links% 3.3.7H  Telephone type circuits used to provide Time Division Multiplex telegraph systems% 3.3.8H  Telephone type circuits used for data transmission% 3.3.9H  Telephone type circuits used as transfer links for common channel Signalling Systems Nos.6 and 7% 5.2.1H  Groups (bidirectional)% 5.2.2H  Supergroups (bidirectional)% 5.2.3H  Mastergroups (bidirectional)% 5.2.4H  Supermastergroups (bidirectional)% 5.2.6H  Restoration groups and supergroups (bidirectional)% 1uij0 CCITT/APIX/DOC/32E4.TXS 10vi:j0CCITT/APIX/DOC/32E4.TXS 0 X 5.3.1H  Multiple destination undirectional groups and supergroups% 5.3.2H  Single destination unidirectional groups and supergroups% 6.1.1H  Conventional group and supergroup links% 6.1.2H  Restoration links% 6.2H  Line links% 8.2H  Bidirectional digital blocks% 8.3H  Restoration digital blocks% 8.4H  Multiple destination unidirectional digital blocks% 8.5H  Single destination unidirectional digital blocks% 9.1H  Conventional digital paths% 9.2H  Restoration digital paths% HHX X  H10.1.1H Groups and supergroups etc., on a mixed analogue/digital route% HHX X  H10.1.2H Digital blocks and paths on a mixed analogue/digital route% +IԌ 10.2H  Routes with two analogue to digital conversions% 11.1H  Data transmission systems% 11.2H  Data transmission links%