ITU-T G 964-2001 V-interfaces at the digital local exchange (LE) C V5 1 interface (based on 2048 kbit s) for the support of access network (AN) (Study Group 15)《数字本地交换机(LE)的V接口 支持接.pdf
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1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.964 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2001) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital sections and digital line system Digital section and digital transmission systems for customer access to ISDN V-
2、interfaces at the digital local exchange (LE) V5.1 interface (based on 2048 kbit/s) for the support of access network (AN) ITU-T Recommendation G.964 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.19
3、9 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCO
4、NNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TESTING EQUIPMENTS G.500G.599 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 General G.900G.909 Parameters for optical fibre cable sy
5、stems G.910G.919 Digital sections at hierarchical bit rates based on a bit rate of 2048 kbit/s G.920G.929 Digital line transmission systems on cable at non-hierarchical bit rates G.930G.939 Digital line systems provided by FDM transmission bearers G.940G.949 Digital line systems G.950G.959 Digital s
6、ection and digital transmission systems for customer access to ISDN G.960G.969 Optical fibre submarine cable systems G.970G.979 Optical line systems for local and access networks G.980G.989 Access networks G.990G.999 For further details, please refer to the list of ITU-T Recommendations. ITU-T G.964
7、 (03/2001) i ITU-T Recommendation G.964 V-interfaces at the digital local exchange (LE) V5.1 interface (based on 2048 kbit/s) for the support of access network (AN) Summary This Recommendation defines a V interface (V5.1) for the connection of an access network (AN) to a local exchange (LE) for the
8、support of the following access types: analogue telephone access; ISDN basic access with a NT1 separate from the AN or integrated in the AN, based on ITU-T G.960 and ITU-T I.430; other analogue or digital accesses for semi-permanent connections without associated outband signalling information, with
9、 flexible (provisioned) information channel (bearer channel) allocation but without concentration capability within the AN. The electrical and functional interface specification uses the 2048 kbit/s parts of ITU-T G.703, ITU-T G.704 and ITU-T G.706. The signalling from the PSTN user port is converte
10、d into a stimulus protocol with a functional part for the signalling path using layer 3 multiplexing for the information from the different user ports. The information from the ISDN D-channels is frame relayed in the access network using the mechanisms defined in ITU-T Q.922. A control protocol defi
11、ned in this Recommendation is used for the exchange of the individual port status and control functions required for the coordination with the call control procedures in the local exchange. In order to coordinate the traffic demands in the various protocols, 1, 2 or 3 communication channels can be p
12、rovisioned to transport the various protocols and frame relayed information. The data link layer for the protocols is defined on the basis of ITU-T Q.920 and ITU-T Q.921. Interface V5.1 is upgradable to V5.2 through re-provisioning and by implementation of the additional functionality. Major differe
13、nces between the first V5.1 Recommendation (1994) and this version are: additional definitions in clause 3; permanent leased line service has been clarified in clause 6; clause 8.7.4 adds flow control on LAPV5-DL; clause 13.3 adds conditional information elements that affect the messages for PSTN an
14、d Control protocol; clauses 13.4.7.11 to 13.4.7.13 add three information elements to the V5 PSTN protocol (listed in Table 7); Tables 29 to 31 have been updated and completed. The last part of the LE table was missing in the previous version. A proposal is to renumber the tables and use Table 29 (th
15、ree part/pages) for the AN side and Table 30 for the LE side (also three pages). These changes have not been done since it affects the Table references in clause 14 as well. ii ITU-T G.964 (03/2001) additional clause to Annex B (B.14); Annex C has highest number of changes. The most important are: s
16、ystem startup (Clause C.13); startup of PSTN data link (Clause C.14); data link failure and reset (Clause C.15); PSTN restart procedure (Clause C.16); states in the system management procedures (Clause C.17); control protocol layer 3 protection mechanism errors (Clause C.18); timers (Table C.1); fai
17、lure on layer 1 (Clause C.20); restarting of interface (Clause C.21); handling of timer TV1 (related to variant and ID check) (Clause C.22); alignment of blocking/unblocking (Clause C.23). Annex J added. Source ITU-T Recommendation G.964 was revised by ITU-T Study Group 15 (2001-2004) and approved u
18、nder the WTSA Resolution 1 procedure on 1 March 2001. ITU-T G.964 (03/2001) iii FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU.
19、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. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for
20、study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on
21、 a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice o
22、r implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development
23、process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore str
24、ongly urged to consult the TSB patent database. ITU 2001 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from ITU. iv ITU-T G.964 (03/2001) CONTEN
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