џWPCL ћџ2BJ|xа АH аа АА X агга ХА6p&А6p&Х аеЄ† а Hр аааУ Уб cмˆ4 PŽТ б Fascicle VII.2 Р-Р Rec. U.62 PAGE1 Єее† а HH аааУ Уб cмˆ4 PŽТ бPAGE4 Fascicle VII.2 Р-Р Rec. U.62 еа HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаа X  аУ Уб cмˆ4 PŽТ бRecommendation U.62 Ср83Сб cмˆ4 PŽТ бGENERAL REQUIREMENTS TO BE MET IN INTERFACING THE INTERNATIONAL Ср80СTELEX NETWORK WITH THE FULLY AUTOMATED MARITIME VHF/UHF RADIO SYSTEMФ Ф Ср8EСУУб cмˆ4 PŽТ б(MalagaР-РTorremolinos, 1984)ФФ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТThe CCITT,ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаУУconsidering а H аФФС С(a)СpСthat it is desirable that the interface between the international telex service and the fully automated maritime VHF/UHF radio system be defined; С С(b)СpСthat the CCIR is charged with the task of making recommendations relating to the radio path of the fully automated maritime VHF/UHF radio systems; С С(c)СpСthat explanation of the detail of the interface between the international telex network and the fully automated maritive VHF/UHF radio systems would be of assistance to the CCIR, УУunanimously recommends аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС  Сthat the interface between the international telex network and the automatic maritime VHF/UHF serviceй+€ automatic maritime VHF/UHF service+йб cмˆ4 PŽТ б should be in accordance with the following requirements: аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚б cмˆ4 PŽТ бУ У1ТX ТGeneralФ ФЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа1.1С  СIn this Recommendation, the term mobileР-Рservice switching centre (MSC) is understood to mean the interworking point between the international or national telex network and the maritime VHF/UHF system. The MSC may have access to a junction called the location register which contains the current location of the mobile stations. 1.2С  СFully automated maritime VHF/UHF radio systems should be capable of interfacing the international telex network in one or more ways: Та ТР-РТ№ Тin accordance with:ЦЦ а H аТа ТТ№ ТТhpТС€Сi)Си СRecommendation U.1, Signalling conditions to be applied in the international telex service (type A and type B signalling);ЦЦ Та ТТ№ ТТhpТС€Сii)Си СRecommendation U.11, Telex and gentex signalling on intercontinental circuits used for intercontinental automatic transit traffic (type C signalling);ЦЦ а H аТа ТТ№ ТТhpТС€Сiii)Си СRecommendation U.12, Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling);ЦЦ а H аТа ТР-РТ№ Тin accordance with Recommendation F.132, Procedures for use of store and forward facilities in the maritime mobile services for shipР-Рoriginated calls,ЦЦ а H аТа ТР-РТ№ Тin accordance with Series F and U Recommendations on international store and forward units.ЦЦ а H а1.3С  СType D signalling (Recommendation U.12) and, as a second choice, type C signalling (Recommendation U.11) are the preferred signalling systems, when they are available within the national boundaries, for the reasons given in Annex A to Recommendation U.60. 1.4С  СThe numbering and selection procedures should be in accordance with Recommendation F.121. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТX јТС€  СС€ HС‚У У2С  Сб cмˆ4 PŽТ бShip originated callsЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ бФ Ф2.1С  СWhen accessing a storeР-РandР-Рforward unit, the shipboard subscriber should select, in accordance with Recommendation F.121, one of the access codes 21 or 22 possibly followed by the character Р"РУ У+Ф ФР"Р in order to gain access to the storeР-РandР-Рforward facility. а H а2.2С  СFor direct access to the telex network, the procedures are given in РSР 3.4 of Recommendation F.121. The following points should be observed: 2.2.1С СIf the endР-РofР-Рselection character Р"РУ У+Ф ФР"Р is not required for technical reasons on the radio path, it must be inserted by the MSC. 2.2.2С СAccess codes (possibly followed by additional digits) as defined in Recommendation F.121 for accessing special services or facilities, may be converted by the MSC to an appropriate number in the telex network when the service or facility is terminated at a point in the telex network other than the MSC. 2.3С  СAny service code generated in the telex network for a particular call should be returned to the calling ship. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТX јТС€  СС€ HС‚У У3С  Сб cмˆ4 PŽТ бShore originated callsЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ бФ Ф3.1Тh  ТУУInterfacing methodsЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe following interfacing methods are possible: а H аТа ТТ№ ТС€ Сa)СpСthrough a storeР-РandР-Рforward unit associated with one or more MCSs;ЦЦ а Hh аТа ТТ№ ТС€ Сb)СpСdirect realР-Рtime access through an MSC. Here, the following subР-Рcategories may exist:ЦЦ Та ТТ№ ТТhpТС€Сi)Си СMSC connected to location registers;ЦЦ Та ТТ№ ТТhpТС€Сii)Си СMSCs not connected to location registers.ЦЦ а H аС СThe technical solutions, including routing principles, required for each of these interfaces, are given below. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.2Тh  ТУУStoreР-РandР-Рforward facilitiesЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ3.2.1С јСThe storeР-РandР-Рforward unitй$ storeР-РandР-Рforward unit$йб cмˆ4 PŽТ б is accessed by normal telex procedures. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.2.2С СProcedures for forwarding messages to the storeР-РandР-Рforward unit and for retransmission of such messages should follow the normal procedures defined in Series F and U Recommendations. 3.2.3С СMessage should be retained for a period of time as defined in Recommendation F.110, РSР 4.4. 3.2.4С СThe storeР-РandР-Рforward unit may be connected to a location register for routing of calls to ships which are currently operating outside their home area. С СThe routing of such calls are described in Annex A. 3.2.5С СFor other applications of storeР-РandР-Рforward units, see РSР 3.3.6 below. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ б3.3Тh  ТУУMSCs connected to location registersЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ3.3.1С јСThe technical arrangement for location registersй location registersйб cмˆ4 PŽТ б is outlined in Annex A. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.3.2С СA system with MSCs connected to location registers corresponds to theУУ level 3ФФ of operation defined in РSР 3.2.4 of Recommendation F.121. С СFor simplicity, the MSC in which the ship station is permanently registered will be referred to as the home MSC. If the ship is not in its home area, the MSC in which the ship station is currently located will be referred to as the visited MSC. 3.3.3С СThe general selection procedures to be used for setting up calls to ships are given in Recommendation F.121. They may lead to the following possibilities: а H№ аТа ТТ№ ТС€ Сб cмˆ4 PŽТ бi)СpСThe calling subscribers enters the following number sequence:ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8СDƒУУ1ФФDУУ2ФФ(DУУ3ФФ)AУУ1ФФAУУ2ФФ(AУУ3ФФ)MIDXУУ4ФФXУУ5ФФXУУ6ФФ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТТ№ Тwhere DУУ1ФФDУУ2ФФ(DУУ3ФФ) is the Recommendation F.69 destination code of the country in which the home MSC of the called ship is located, AУУ1ФФAУУ2ФФ(AУУ3ФФ) is the service access code in that country and MIDXУУ4ФФXУУ5ФФXУУ6ФФ is the ship station number (MID = maritime identification digit). This can only consist of 6 digits for reasons given in Recommendation F.120. This implies that ship stations with more than 6 digits cannot be accessed automatically.ЦЦ а H аТа ТТ№ ТУУNoteФФ Р-Р The MID may on a regional basis be replaced by the digits 8Y thus permitting a seventh digit XУУ7ФФ of the ship station number (see Recommendation F.120 for details).ЦЦ а H аТа ТТ№ ТThe call is routed on the international telex network directly to the home MSC of the called ship station.ЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТX  ТТh ТТ№ ТIt may also be possible to employ twoР-Рstage selection where the first stage is used for accessing the location register in the country of destination and the second stage for transferring the ship station numberй? ship station numberб cмˆ4 PŽТ б?й. This procedure would allow ship stationд k+д numbers to consist of up to 9 digits (see note to РSР 3.4.2).ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТТ№ ТС€ Сii)СpСIf the country of origin has its own location register and the country of destination has a classР-РofР-Рtraffic assigned to the maritime VHF/UHF service, it would in principle be possible to access a ship by the following selection sequence from the calling subscriber:ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8 СAƒУУ1ФФAУУ2ФФ(AУУ3ФФ)MIDXУУ4ФФ . . . XУУnФФ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТТ№ Тwhere AУУ1ФФAУУ2ФФ(AУУ3ФФ) is the service access code for maritime services in the country of origin or a Recommendation F.69 destination code allocated to the maritime VHF/UHF service, and MIDXУУ4ФФ . . . XУУnФФ is a ship station number consisting of up to 9 digits.ЦЦ а H аТа ТТ№ ТAlternatively, twoР-Рstage selection may be used. The first stage is used for accessing the location register and the second stage for transferring the number of the called ship (see note to РSР 3.4.2).ЦЦ а H аТа ТТ№ ТThe call is forwarded to the country of destination by the location register in the country of origin. This is done by sending the following address sequence of digits on the international network:ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHp8А"(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ Ьа‚С СС pССШ8СDƒУУ1ФФDУУ2ФФ(DУУ3ФФ)MIDXУУ4ФФ . . . XУУnФФC а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТТ№ Тwhere DУУ1ФФDУУ2ФФ(DУУ3ФФ) is the destination code of the country of destination and C is a classР-РofР-Рtraffic character identifying maritime VHF/UHF service in the country of destination. The destination code DУУ1ФФDУУ2ФФ(DУУ3ФФ) is uniquely determined from the MID part of the ship station number.ЦЦ а H аТа ТТ№ ТIn order to operate such a system, class of traffic signals need to be defined or type A, C and D signalling. Type B signalling cannot support such a class of traffic signal.ЦЦ а H а3.3.4С СIf the called ship is currently located at another MSC than the home MSC, the home MSC may reroute the call to the required destination. The address format inserted by the home MSC for the purpose of rerouting would be one of those given in РSР 3.3.3 depending on the facilities available. С СIf the call cannot be rerouted, the service code ABS or another more suitable service code should be returned from the home MSC. а H а3.3.5С СWhen operating a system where rerouting would be required, the following timeР-Рouts should be observed: С СУУTypes A and B signalling (Recommendation U.1)ФФ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH(pи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТр( ТТ№  ТThe time from the end of selection, combination No. 26 (У У+Ф Ф), or last selection character received and the return of the call connected signal should not exceed 60 seconds.ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС СУУType C signalling (Recommendation U.11)ФФ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH(pи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТр( ТТ№  ТThe time taken from the end of selection signal, combination No. 26 (У У+Ф Ф), to the callР-Рconnected signal should not exceed 60 seconds (see Table 1/U.11, remarks relating to the callР-Рconnected signal).ЦЦ а HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС СУУType D signalling (Recommendation U.12)ФФ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH(pи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТр( ТТ№  ТThe time taken from the end of selection signal, CSC code No. 11, to the call connected signal should not exceed 90 seconds (see Recommendation U.12, РSР 3.11).ЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС СУУNoteФФ Р-Р It should be noted that for type A, B and C signalling, the same timings pertain to service signals (У УNPФ Ф,У У NCФ Ф,У У NAФ Ф,У У OCCФ Ф, etc.), and that in addition for type D signalling the same timing pertains to the last backward path signalling characters and terminatingР-Рthrough connection. а H а3.3.6С СFor technical or operational reasons, e.g. when the timeР-Рout requirements of РSР 3.3.5 cannot be met, the home MSC (or home location register) of the called ship station may offer the calling subscriber, by an appropriate service code, a storeР-РandР-Рforward service for forwarding the call to the ship. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.4Тh  ТУУMSCs not connected to location registersЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФ3.4.1С СIn the case of MSCs not connected to location registers, the calling telex subscriber must know the actual location of the called ship, e.g. country, MSC, coast station. а H аС СThis situation would correspond to theУУ level 2ФФ of operation as described in РSР 3.2.3 of Recommendation F.121. The required selection procedure is given in Recommendation F.121. 3.4.2С СTwoР-Рstage selection may be used where the first stage is used for accessing the required MSC (or coast station) and the second stage for transferring the ship station number. This procedure would allow ship station numbers to consist of up to 9 digits. а H аС СУУNoteФФ Р-Р TwoР-Рstage selection may be difficult from an automatic terminal. 3.4.3С СIf the called ship does not respond to the call, the MSC (or coast station) should return the service code ABS or another more suitable service code. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.5Тh  ТУУService codesЦЦ а H ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СFor unsuccessful calls, the MSC (or coast station) should return service codes as defined in Recommendation F.131. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа3.6Тh  ТУУMaritime answerback codeЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаФФС СThe answerback of the ship station should be in accordance with Recommendation F.130. The MSC (or the coast station) should ensure that the answerback which is sent into the telex network consists of 20 consecutive characters sent at cadence speed. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа‚У У4ТX ТMaritime group callsФ ФЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.1С  СThe composition of a group call address is defined in Recommendation F.120. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬа4.2С   СIf group call servicesй group call servicesйб cмˆ4 PŽТ б are at all permitted in the maritime VHF/UHF service, the MSCs (or coast stations) should only permit such calls from authorized telex subscribers. аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаС СThe authorization may be established in one of the following ways: а H аТа ТТ№ ТС€ Сб cмˆ4 PŽТ бi)СpСwhen type A, B or C signalling is used between the MSC (coast station) and the telex network, the WRU answerback sequence should apply,ЦЦ а H аТа ТТ№ ТС€ Сii)СpСwhen type D signalling is used, the calling line identification procedure should apply. If Control Signalling Code No. 12 is received, the WRU/answerback procedure defined above should be used.ЦЦ а H а4.3С  СCalls from unauthorized subscribers should be cleared with the service codeУ У NAФ Ф. ‚Ср VСб cмˆ4 PŽТ бANNEX A Ср MСб cмˆ4 PŽТ б(to Recommendation U.67) аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр =СУ УUse ofб cмˆ4 PŽТ б location registers in the maritime VHF/UHF service аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаб cмˆ4 PŽТ бФ ФA.1С  СFor the automatic maritime VHF/UHF radiotelephone service, CCIR Recommendation 586 describes the procedures to be used on the radio path for updating of location information. A similar procedure would be applicable for а H аthe radiotelex service. The location updating is initiated by the ship station when the station detects a change in the coast station identity after the criteria given in CCIR Recommendation 587. а H аA.2С  СEach MSC is connected to a location register which keeps an updated list of the current location of all ship stations registered in that MSC (the home MSC of the stations). The home MSC of a ship station should be uniquely determined from the MID and possibly one or two additional digits of the ship station number. С СThe location registers are interconnected for mutual updating of the location of ship stations. A.3С  СInsofar as routing of telex calls to shipsйK routing of telex calls to shipsб cмˆ4 PŽТ бKй is concerned, there are several possibilities: A.3.1С СThe telex call is always routed directly to the home MSC by the procedures given in РSР 3.3.3 i). If the called ship is at another MSC (a visited MSC) than the home MSC, the call is rerouted by the home MSC to the appropriate destination. A.3.2С СThe call is routed to an MSC or location register in the calling subscriber's country by the method given in РSР 3.3.3 ii). The further routing of the call may then be done by either of the following methods: а H аТа ТТ№ ТС€ Сi)СpСthe call is routed to the home MSC and, if required, rerouted by that MSC as described in РSР A.3.1 above;ЦЦ а H аТа ТТ№ ТС€ Сii)СpСthe MSC in the country of origin interrogates the home location register of the mobile station in order to obtain the required routing information. If the called ship station is located in some visited MSC, the MSC may then route the call directly to the required destination.ЦЦ а HH а