1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU SERIES I: INTEGRATED SERVICES NETWORK ISDN user-network interfaces 1.414 (09/97) DIGITAL Overview of Recommendations on Layer I for ISDN and 6-ISDN customer accesses ITU-T Recommendation I .414 (Previously CC
2、ITT Recommendation) STD-ITU-T RECMN 1-414-ENGL 1997 I 4862593 Ob422L9 7b2 ITU-T I-SEIUES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK GENERAL STRUCTURE I. 100-1.199 Terminology 1.1 10-1.1 19 Description of ISDNs I. 120-1.129 General modelling methods 1.130-1.139 Telecommunication network and
3、service attributes I. 1 40-1.149 General description of asynchronous transfer mode I. 150-1.199 SERVICE CAPABILITIES 1.200-1.299 Scope 1.200-1.209 General aspects of services in ISDN 1.2 10-1.219 Common aspects of services in the ISDN 1.220-1.229 Bearer services supported by an ISDN 1.230-1.239 Tele
4、services supported by an ISDN 1.240-1.249 Supplementary services in ISDN 1.250-1.299 1.300-1.399 OVERALL NETWORK ASPECTS AND FUNCTIONS Network functional principles 1.310-1.319 Reference models 1.320-1.329 Numbering, addressing and routing 1.330-1.339 Connection types 1.340-1.349 Performance objecti
5、ves 1.350-1.359 Protocol layer requirements 1.360-1.369 General network reauirements and functions 1.370-1.399 . . ISDN USER-NETWORIC INTERFACES I.4W1.499 Application of I-series Recommendations to ISDN user-network interfaces Layer 1 Recommendations Layer 2 Recommendations Layer 3 Recommendations M
6、ultiplexing, rate adaption and support of existing interfaces Aspects of ISDN affecting terminal requirements INTERNETWORK INTERFACES MAINTENANCE PRINCIPLES B-ISDN EQUIPMENT ASPECTS ATM equipment Management of ATM equipment I .420-1.429 1.430-1.439 1.440-1.449 1.450-1.459 1.460-1.469 1.470-1.499 1.5
7、00-1.599 1.600-1.699 1.700-1.799 1.730-1.749 1.750-1.799 For further details, please refer to ITU-T List of Recommendations. STDmITU-T RECMN 1.414-ENGL 1997 81 4862571 Ob42220 484 ITU-T RECOMMENDATION 1.414 OVERVIEW OF RECOMMENDATIONS ON LAYER 1 FOR ISDN AND B-ISDN CUSTOMER ACCESSES Summary This Rec
8、ommendation describes the configurations of ISDN and B-ISDN customer accesses, and lists the relevant reference points for the access network interfaces. This Recommendation gives an overview of the relevants Recommendations mainly on Layer 1 aspect for ISDN and Ei-ISDN customer accesses. Source ITU
9、-T Recommendation 1.414 was prepared by ITU-T Study Group 13 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 19th of September 1997. Recommendation 1.414 (09/97) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field
10、 of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis
11、. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the proce
12、dure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a t
13、elecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the
14、 evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents
15、, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1998 All rights reserved. No part of this publication may be reproduced or utili
16、zed in any forrnor by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. ii Recommendation 1.414 (09/97) STD-ITU-T RECMN 1.414-ENGL 1997 m 48b2591 Ob42222 257 m CONTENTS 1 Scope 2 References 3 Abbreviations and definitions 3.1 Abbre
17、viations 3.2 Definitions 4 ISDN customer access 5 3-ISDN customer access Appendix I -Examples of access network implementation and the related basic requirements on VB interfaces 1.1 Introduction 1.2 Examples of access network implementation and the related basic requirements 1.3 1.4 Performance par
18、ameters . Specific interfaces for UNI and SNI . Recommendation 1.414 (09/97) . Page 1 1 2 2 2 3 3 7 7 8 13 13 . 111 Recommendation 1.414 OVERVIEW OF RECOMMENDATIONS ON LAYER 1 FOR ISDN AND B-ISDN CUSTOMER ACCESSES (Geneva, 199 7) 1 Scope This Recommendation describes the configurations of ISDN and B
19、-ISDN customer accesses, and lists the relevant reference points for the access network interfaces. This Recommendation gives an overview of the relevant Recommendations mainly on Layer 1 aspect for ISDN and B-ISDN customer accesses. 2 References The following ITU-T Recommendations and other referen
20、ces contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to in
21、vestigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid IT-T Recommendations is regularly published. ITU-T Recommendation G.701 (1993), Vocabulary of digital transmission and multiplexing, and Pulse Code Mo
22、dulation (PCM) terms. ITU-T Recommendation G.704 (1995), Synchronous fiame structures used at 1544, 6312, 2048, 8488 and 44 736 kbit/s hierarchical levels. ITU-T Recommendation G.707 (1996), Network node interface for the Synchronous Digital Hierarchy (SDH). ITU-T Recommendation G.784 (1994), Synchr
23、onous Digital Hierarchy (SDH) management. ITU-T Recommendation G.804 (1993), ATM cell mapping into Plesiochronous Digital Hierarchy (PDH). ITU-T Recommendation G.902 (1995), Framework Recommendation onfunctional access networks -Architecture, andfunctions, access types management and service node as
24、pects. ITU-T Recommendation G.960 (1993), Access digital section for ISDN basic rate access. ITU-T Recommendation G.961 (1993), Digital transmission system on metallic local lines for ISDN basic rate access. IT-T Recommendation G.962 (1993), Access digital section for ISDNprimary rate at 2048 kbits.
25、 ITU-T Recommendation G.963 (1993), Access digital section for ISDNprimary rate at 1544 kbits. ITU-T Recommendation G.964 (1994), V-interfaces at the digital Local Exchange (LE) - VS.1-interface (based on 2048 kbits) for the support ofAccess Network (AN). ITU-T Recommendation G.965 (19951, V-interfa
26、ces at the digital Local Exchange (LE) - V5.2-interface (based on 2048 kbit/s) for the support of Access Network (AN). ITU-T Recommendation I. 1 12 (1993), Vocabulary of terms for ISDNs. IT-T Recommendation I. 1 13 (1997), Vocabulary of terms for broadband aspects of ISDN. ITU-T Recommendation 1.4 1
27、 1 (1 993), ISDN user-network interfaces - Reference configurations. ITU-T Recommendation 1.41 3 ( 1993), B-ISDN user-network interface. ITU-T Recommendation 1.430 (1995), Basic user-network interface -Layer 1 specqkmtion. ITU-T Recommendation 1.43 1 (1993), Primary rate user-network interface - Lay
28、er I specification. Recommendation 1.414 (09/97) 1 - ITU-T Recommendation 1.432.1 (1996), B-ISDN user-network interface - Physical layer specifiction: general characteristics. - ITU-T Recommendation 1.432.2 ( 1996), B-ISDN user-network interface - Physical layer specification: I55 520 kbith and 622
29、080 kbith operation. ITU-T Recommendation 1.432.3 (1996), B-ISDN user-network interface - Physical layer specification: 1544 kbit/s and 2048 kbids operation. - - ITU-T Recommendation 1.432.4 (1 996), B-ISDN user-network interface - Physical layer specification: 51 840 kbith operation. - ITU-T Recomm
30、endation 1.432.5 (1 997), B-ISDN user-network interface - Physical layer speclfication: 25 600 kbit/s operation. CCITT Recommendation 1.601 (1988), General maintenance principles of ISDN subscriber access and subscriber installation. ITU-T Recommendation 1.6 10 (1 9954, B-ISDN operation and maintena
31、nce principles andjnctions. ITU-T Recommendation 1.73 1 (1996), Types and general characteristics of ATM equipment. ITU-T Recommendation 1.732 (1996), Functional characteristics of ATM equipment. CCITT Recommendation M.3602 (1992), Application of maintenance principles to ISDN subscriber installatio
32、ns. CCITT Recommendation M.3603 (1992), Application of maintenance principles to ISDN basic rate access. CCITT Recommendation M.3604 (1992), Application of maintenance principles to ISDNprimary rate access. NOTE -Recommendations M.3602 to M.3604 were formerly numbered as Recommendations 1.602 to 1.6
33、04, respectively. ITU-T Recommendation Q.512 (1995), Digital exchange intelfaces for subscriber access. - - - - - - - - 3 Abbreviations and definitions 3.1 Abbreviations This Recommendation uses the following abbreviations: ATM Asynchronous Transfer Mode ET Exchange Termination NT Network Terminatio
34、n PDH Plesiochronous Digital Hierarchy PMD Physical Media Dependent SNI Service Node Interface SDH Synchronous Digital Hierarchy TE Terminal Equipment TC Transmission Convergence UNI User Network Interface vc Virtual Channel VCC Virtual Channel Connection VP Virtual Path 3.2 Definitions Definitions
35、of terms and abbreviations for ISDN customer access used in this Recommendation and the listed Recommendations are defined in the Recommendations 1.1 12 and G.701. 2 Recommendation 1.414 (09197) STD-ITU-T RECMN 1.414-ENGL II997 I 4862593 Ob42225 Tbb I Definitions of terms and abbreviations for B-ISD
36、N customer access used in this Recommendation and the listed Recommendations are defined in Recommendation 1.1 13. 3.2.1 B-ISDN Layer 1: The functions of the Physical Layers of the B-ISDN Protocol Reference Model as defined in Recommendation 1.321, which includes the PMD (Physical Media Dependent) a
37、nd TC (Transmission Convergence) sublayers only. 4 ISDN customer access Figure 1 shows an overview of access arrangements and gives the relevant Recommendations on layer 1 for ISDN customer access. Relevant Recommendations are given in Tables 1-1 and 1-2. Requirements for V-reference points are defi
38、ned in Recommendation Q.5 12. The access arrangements shown in Figure 1 are not intended to be either exhaustive or mandatory. Other Recommendations also affecting Layer 1 aspects (e.g. protection against overvoltages, electric safety requirements, etc.) are referred to in some Layer 1 Recommendatio
39、ns at the appropriate place. 5 B-ISDN customer access Figure 2 shows an overview of access arrangements and gives the relevant Recommendations mainly for B-ISDN customer access. Relevant Recommendations and their status are given in Tables 2-1 and 2-2. The access arrangements shown in Figure 2 are n
40、ot intended to be either exhaustive or mandatory. Other Recommendations also affecting Layer 1 aspects are referred to at the appropriate clauses of these Recommendations. The following types of broadband access arrangements have been identified: a) Direct access arrangements In a direct access arra
41、ngement the UNI is connected to the ET function in the SN through its individual broadband access digital section which is using a transmission system. There is functionally an individual VB reference point between the ET function and the broadband access digital section for any individual customer.
42、 Two applications are contained in the direct access arrangement: 1) the homogeneous case where the transport capacity at the UNI is identical to the transmission system used in the broadband access digital section; 2) the non-homogeneous case where a transmission system with lower transport capacit
43、y is used other than at the UNI. The additional requirements for case 2) are defined in an annex to Recommendation G.96. This case is illustrated at the top part of Figure 2. b) In this remote access arrangement, the UNI is connected to the ET function in the SN through an access network which perfo
44、rms multiplexingkross connecting functions at the VP andor VC layer under control of the access network management. The access network may include broadband access digital sections, further digital sections, and multiplexingkross connecting functions at the transmission layer (e.g. SDH). Remote acce
45、ss arrangements with ATM multiplexing/cross connecting in the access network This case is illustrated as the second type in Figure 2. c) As for the remote access arrangement described in case b), the UNI is connected to the ET function in the SN through an access network. In addition to the function
46、s described for case b), this type of broadband access arrangement includes on-demand VC connection allocation functions in the access network under control of the service node. This case is illustrated at the bottom part of Figure 2. Remote access arrangements with additional on-demand allocation o
47、f VCCs in the access network Recommendation 1.414 (09/97) 3 Other remote access arrangements and relevant VB reference points may be defined later if required for specific broadband network design and interface specifications. 30 NTl LT iic Ref er en c e point (Rec. 1.411) Reference point 4 ISDN cus
48、tomer access Rec. 1.601 b 4 Customer equipment Rec. M.3602 B Rec 1 TE1 Direct access Rec S II I. Ra Rec. 1.430 Rec. 1.431 Remote access application of multiplexing in Access Network Remote access application of concentration in Access Network ;i 1 1 Reference point i/ II ,I - v1 I )fi Basic access d
49、igital section Rec. G.960 U I1 NT1 I Recs. G.962 and G.963 jj I! Access Network Rec. G.902 I v1 1 M I Basic access i! i! I! ii y5; 1 (Note 1) 1 1 j! V5.1 Rec., G.96 II Rec. G.964 II ! II 1: -l i Digitalsection+ :t j/ i/ b 11 I A! digital section II Digital access link Rec.G.960 I! Access Network i/ t, l i II II II II NT1 Primary rate access digital section Recs. G.962 and G.963 F! NTl Basic access diaital section Rec. G.960 il j/ II (Note 1) j 1, II II I, I 8, II 4, I, - Digital section Rec. G.707 for SDH Rec. G.704 for PDH V5:2 I- Rec. G.965 ! I 4 ij I
