ÿWPCL ûÿ2BJ|xÐ ` ÐÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿà¨ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐÐ °°°è ÐÁà=ÁÑ Âx„|ü@Ž ÑÐ Å°6Ø'°6Ø'Å ÐÓÓÃÃCONTENTSÄă ÁàÁÁ¨;ÁÃÃPageÄÄ Ð ( Ð1.ÁàÁSECTION 1 © NETWORK FUNCTIONAL PRINCIPLES....................... 3 Ð Ð1.1Á¨;ÁRecommendation I.310 © ISDN network functional principles....... 3 2.ÁàÁSECTION 2 © REFERENCE MODELS....................................ÁDX EÁ 35 Ð Ð2.1Á¨;ÁRecommendation I.320 © ISDN protocol reference model............Á{ :|Á 35 Ð Ð2.2Á¨;ÁRecommendation I.324 © ISDN network architecture................Á{ :|Á 49 Ð Ð2.3Á¨;ÁRecommendation I.325 © Reference configurations for ISDN ÁàÁconnection types.................................................ÁEÐ FÁ 64 Ð Ð2.4Á¨;ÁRecommendation I.326 © Reference configurations for ÁàÁrelative.network resource requirements.......................... ÁEÐ FÁ 73 3.ÁàÁSECTION 3 © NUMBERING, ADDRESSING AND ROUTING...................ÁDX EÁ 76 Ð Ð3.1Á¨;ÁRecommendation I.330 © ISDN numbering and addressing ÁàÁprinciples......................................................ÁDX EÁ 76 Ð Ð3.2Á¨;ÁRecommendation I.331 © Numbering plan for the ISDN era.......... 85 Ð Ð3.3Á¨;ÁRecommendation I.332 © Numbering principles for interworking ÁàÁbetween ISDNs and dedicated networks with different ÁàÁnumbering plans................................................. 85 Ð Ð3.4Á¨;ÁRecommendation I.333 © Terminal selection in ISDN...............Á{ :|Á 90 Ð Ð3.5Á¨;ÁRecommendation I.334 © Principles relating ISDN ÁàÁnumbers/subaddresses to the OSI reference model network layer ÁBhCÁaddresses........................................................Á.¨;Á112 Ð Ð3.6Á¨;ÁRecommendation I.335 © ISDN routing principles.................. 118 4.ÁàÁSECTION 4 © CONNECTION TYPES....................................ÁDX EÁ145 Ð Ð4.1Á¨;ÁRecommendation I.340 © ISDN connection types.................... 145 5.ÁàÁSECTION 5 © PERFORMANCE OBJECTIVES..............................ÁDX EÁ166 Ð Ð5.1Á¨;ÁRecommendation I.350 © General aspects of Quality of Service ÁàÁand network performance in digital networks, including Á; <ÁISDNs...........................................................Á&¨;Á166 Ð Ð5.2Á¨;ÁRecommendation I.351 © Recommendations in other services ÁàÁincluding network performance objectives that apply at ÁàÁT reference point of an ISDN.................................... 180 Ð Ð5.3Á¨;ÁRecommendation I.352 © Network performance objectives for ÁàÁconnection processing delays in an ISDN......................... 180 ÐÌÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿH ø¨ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÌÐ1.ÁHÁSECTION 1 © NETWORK FUNCTIONAL PRINCIPLES 1.1ÁHÁÃÃRecommendation I.310ÄÄ Áà°DÁISDN©NETWORK FUNCTIONAL PRINCIPLESƒ Áà°NÁFIGURE 1/I.310ƒ Áà°UÁƒ Áà°BÁÃÃISDN network series of RecommendationsÄă 1.2ÁHÁÃÃServices supported by an ISDNÄÄ ÁHÁThe concepts and the principles of an ISDN are described in Recommendation I.120. The services supported by an ISDN are given in the I.200©Series of Recommendations. A classification and the tools for the description of telecommunication services are specified in Recommendation I.210 according to the description method as given in Recommendation I.130. The network capabilities to support these services are defined in the I.300©Series of Recommendations. The relationship between these Recommendations and some other relevant I©Series Recommendations is shown in Figure 1/I.310. (7) ÁHÁ©Á  Áthe low©layer functions (LLF) relate to the bearer services; ÁHÁ©Âà  Âthe high©layer functions (HLF) together with the lower layer functions relate to the teleservices.ÆÆ (10) ÁHÁRecommendation I.324 introduces the functional grouping CRF (Connection Related Functions). The CRF can be local, national transit or international transit. EFs canÔ ñ,Ô be associated with each of these. (15) ÁHÁ©Âà  ÂBasic EFs: For each connection type, there are up to 8 BFGs to implement (see Table 1). Therefore each BFG is composed of basic EFs related to this connection type. However some basic EFs may be common to several connection types (e.g. "called number analysis" belonging to the BGF "routing").ÆÆ ÁHÁ©Âà  ÂAdditional EFs: Additional EFs form a common set of functional elements available to build up the various AGFs, and so to implement supplementary services.ÆÆ ÁHÁThis grouping of EFs into sets of BGFs and AGFs is illustrated in Figure 6/I.310. (26)