ÿWPCL ûÿ2BJ|xÐ ` ÐÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿH øÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐÐ °°°è ÐÑ Âx„|ü@Ž ÑÐ Å°6Ø'°6Ø'Å ÐÕYÏ Ð ` Ð Áà?Á© ©ƒ Áà<ÁAP IX©145©Eƒ ÁàAÁƒYÕÕYÏ Ð ` Ð Áà?Á© ©ƒ Áà<ÁAP IX©145©Eƒ ÁàAÁƒYÕÕI (3294) ÕÕI (3294) ÕÐ °è  Ð2.4ÁHÁÓÓÃÃRecommendation I.326ÄÄ Ð ø ÐÁàð#ÁREFERENCE CONFIGURATIONS FOR RELATIVE NETWORK RESOURCE REQUIREMENTSƒ 1.ÁHÁÃÃGeneralÄÄ Ð Ð ÐÁHÁThe purpose of this Recommendation is to evaluate the relative network resource requirements associated with the provision of ISDN telecommunication services to subscribers as they are defined in the I.200©Series. ÁHÁThe evaluation of relative network resource requirements and the definition of reference configuration is the first step in cost evaluation for ISDN services. Such cost evaluation is not covered in this Recommendation. 2.ÁHÁÃÃRelative resource requirementsÄÄ 2.1ÁHÁÃÃRelation with service provisionÄÄ ÁHÁFor each service requested by a user the network has to provide network resources. These network resources involve switching, signalling and transmission capabilities. The selection of the appropriate network resource is part of the routing function. ÁHÁThe combination of permissible network resources is described by the logical concept of ISDN connection types. The list of agreed ISDN connection types can be found in I.340. ÁHÁThe network resources described by an ISDN connection type are: À ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ À À À À À ÀÀ switching capability À À À À À À À À À À Network resource À À ÀÀ transmission capability À À À À À À À À À À À À ÀÀ signalling capability À À À ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ À ÁàHHÁFIGURE 1/I.326ƒ ÁàHOÁƒ ÁàHBÁÃÃNetwork resource componentsÄă ÁHÁThe network resource has an overall scope and may imply several sub© networks, each having to provide an appropriate part of the overall network resource. 2.2ÁHÁÃÃInformation transfer on network resource usageÄÄ ÁHÁInformation on ISDN network resources utilized and that of any interworked networks needs to be gathered for charging or for accounting purposes and conveyed to possibly several points within the network(s). Much of this information is likely to be derived from data carried on signalling network (e.g. information associated with set©up, clear down, and/or change of status of connections). It may be passed in batch©mode between administrations or may be conveyed in real©time. 3.ÁHÁÃÃReference configuration for chargingÄÄ 3.1ÁHÁÃÃDevelopmentÄÄ ÁHÁRecommendation I.340 and other relevant Recommendations: I.310, I.324, I.325; are considered as the starting point for the development of reference configuration for relative cost evaluation. ÁHÁISDN resources would be represented by network functions as, for example: ÁHÁ©Âà  Âtransmission functions (local, transit) using different techniques (digital, analogue, speech interpolation ...);ÆÆ ÁHÁ©Âà  Âswitching functions (local, transit) for circuit©mode, packet©mode;ÆÆ ÁHÁ©Âà  Âinterworking functions;ÆÆ ÁHÁ©Á  Áhigh layer functions. 3.2ÁHÁÃÃSituationsÄÄ ÁHÁReference configurations should include a description of the various situations encountered in international interconnections. This description should include the originating country, the boundary, the destination country, interworking unit location, international transit. 3.3ÁHÁÃÃReference configuration for circuit©modeÄÄ ÁHÁThe reference configuration for circuit©mode ISDN connection types is made of three connection elements: ÁHÁ©Á  ÁAccess connection element; ÁHÁ©Á  ÁNational transit connection element; ÁHÁ©Á  ÁInternational transit connection element. ÁHÁThe minimum relative resource requirements for international transit connection elements are described in Table 1/I.326 below: ÁàHIÁTABLE 1/I.326ƒ À ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ À À À À À Possible resources À À Relative À À À À Service request À À for an international À À resource À À À À À À transit connection À À requirement À À À À À À element À À (see Note 4) À À ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ À À1) 64 kbit/s À À 64 kbit/s À À 1 À À À À unrestricted À À À À À À ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÔ _(ÔŒ À À À À 64 kbit/s, DSI/LRE À À as low as À À À À2) Speech À À gain 5:1 (see Note 1) À À 0.2 À À À À À À A/ÀÀ, echo control À À À À À À À À (see Note 2) À À À À ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ À À3) 3.1 kHz À À 64 kbit/s, LRE À À as low as À À À À Audio À À gain 2:1 (see Note 3) À À 0.5 À À À À À À A/ÀÀ, echo control À À À À À À À À (see Note 2) À À À À À ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ À ÃÃNote 1ÄÄ © State©of©the©art voice processing technology is capable of achieving a circuit gain of up to 5:1 on speech calls by using a combination of digital speech interpolation (DSI) and low rate encoding (LRE) at 32 kbit/s. Even higher gains are conceivable in the future with advances in LRE technology. ÃÃNote 2ÄÄ © The need for echo control in end©to©end ISDN connections is under study. ÃÃNote 3ÄÄ © ISDN services when used to support voice©band data via modems cannot benefit from DSI gains. ÃÃNote 4ÄÄ © The values mentioned in the third column represent relative resource requirements (i.e. traffic allowed in terms of bit rate or bandwidth) and should not be interpreted as cost evaluation. 3.4ÁHÁÃÃReference configuration for packet©modeÄÄ ÁHÁFor further study. 3.5ÁHÁÃÃReference configuration for HLFÄÄ ÁHÁFor further study. 3.6ÁHÁÃÃReference configuration for ALLFÄÄ ÁHÁFor further study. 3.7ÂàHÂÃÃReference configuration for Public Land Mobile TelecommunicationÄÄ ÃÃservicesÄÄÆÆ ÁHÁReference configuration for Public Land Mobile Telecommunication Systems can be found in Recommendation D.93.