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

25、TS Page 1 Scope. 1 2 References. 2 3 Definitions 2 4 Electrical and physical interface requirements . 5 5 Procedural interface requirements 6 6 Services and architecture aspects and requirements . 6 6.1 On-demand services 6 6.1.1 PSTN . 6 6.1.2 ISDN basic access . 6 6.2 Permanent Line (PL) capabilit

26、y 7 6.3 Semi-permanent leased line 7 6.4 Permanent leased line services . 8 7 Control and provisioning 8 7.1 Control principles . 8 7.1.1 General requirements and assumptions . 8 7.1.2 Control of ISDN user port for the PL capability . 10 7.2 Provisioning strategy and requirements 11 7.2.1 General. 1

27、1 7.2.2 Provisioning requirements. 11 8 Protocol architecture and multiplexing structure 12 8.1 Functional description. 12 8.2 Protocol requirements for PSTN and ISDN . 13 8.3 Time slots 14 8.4 Time slot allocation for communication channels 14 8.5 Layer 2 sublayering and multiplexing on communicati

28、on channels 15 8.6 Layer 3 multiplexing. 15 8.7 Congestion control 15 8.7.1 Flow control end to end . 15 8.7.2 Congestion control on the V5.1 interface 16 8.7.3 Blocking of ISDN user ports at layer 2 . 16 8.7.4 Flow control using LAPV5-DL mechanisms 16 9 Envelope Function Sublayer of LAPV5 (LAPV5-EF

29、) . 16 9.1 Frame structure for peer-to-peer communication . 16 9.1.1 General. 16 ITU-T G.964 (03/2001) v Page 9.1.2 Flag sequence 16 9.1.3 Interframe time fill. 17 9.1.4 Envelope function address field 17 9.1.5 Envelope information field 17 9.1.6 Transparency . 17 9.1.7 Frame check sequence (FCS) 17

30、 9.1.8 Format convention. 17 9.1.9 Invalid frames 17 9.1.10 Frame aborts 18 9.2 Format of fields for data link envelope peer-to-peer communication 18 9.2.1 Envelope function address field format. 18 9.2.2 Address field variables 18 10 Data link sublayer of LAPV5 (LAPV5-DL). 18 10.1 Frame structure f

31、or peer-to-peer communication . 18 10.1.1 General. 18 10.1.2 Link address field 19 10.1.3 Control field. 19 10.1.4 Information field 19 10.1.5 Format convention. 19 10.2 Invalid frames . 19 10.3 Elements of procedures and formats of fields for data link sublayer peer-to-peer communication 19 10.3.1

32、Link address field format. 19 10.3.2 Link address field variables. 20 10.3.3 Control field formats . 20 10.3.4 Control field parameters and associated state variables 20 10.3.5 Frame types 20 10.4 Definition of the peer-to-peer procedures of the data link sublayer . 20 10.4.1 General. 20 10.4.2 Proc

33、edure for the use of the P/F-bit. 22 10.4.3 Terminal Endpoint Identifier (TEI) management procedures . 22 10.4.4 Automatic negotiation of data link layer parameters. 22 10.4.5 Procedures for establishment and release of multiple frame operation. 22 10.4.6 Procedures for information transfer in multi

34、ple frame operation 24 10.4.7 Re-establishment of multiple frame operation 25 10.4.8 Exception condition reporting and recovery . 25 10.4.9 List of system parameters 25 10.4.10 Data link monitor function . 26 10.4.11 PSTN and control data link FSM and requirements 26 vi ITU-T G.964 (03/2001) Page 11

35、 AN frame relay sublayer. 28 11.1 General 28 11.2 Invalid frames . 29 11.3 Detailed description of the AN frame relay function . 29 11.3.1 Frame received from LE 30 11.3.2 Frame received from ISDN user port 30 12 Sublayer-to-sublayer communication and mapping function. 30 12.1 LAPV5-EF to LAPV5-DL c

36、ommunication 30 12.2 LAPV5-DL to LAPV5-EF communication 31 12.3 AN-FR to LAPV5-EF communication. 31 12.4 LAPV5-EF to AN-FR communication. 31 13 PSTN signalling protocol specification and layer 3 multiplexing 31 13.1 General 31 13.1.1 Introduction . 31 13.1.2 Separation of responsibilities. 32 13.1.3

37、 National specific PSTN signal information elements 32 13.2 PSTN protocol entity definition 33 13.2.1 Definition of PSTN path states and explanation . 33 13.2.2 Definition of PSTN protocol primitives, messages and timers . 34 13.3 PSTN protocol message definition and content 37 13.3.1 ESTABLISH 38 1

38、3.3.2 ESTABLISH ACK 38 13.3.3 SIGNAL. 39 13.3.4 SIGNAL ACK . 40 13.3.5 STATUS 40 13.3.6 STATUS ENQUIRY . 40 13.3.7 DISCONNECT 41 13.3.8 DISCONNECT COMPLETE 41 13.3.9 PROTOCOL PARAMETER. 42 13.4 General message format and information element coding . 42 13.4.1 Overview . 42 13.4.2 Protocol discrimina

39、tor . 43 13.4.3 Layer 3 address 43 13.4.4 Message type . 43 13.4.5 Coding of other information elements. 44 13.4.6 Single octet information elements . 45 13.4.7 Information elements with variable length format 47 ITU-T G.964 (03/2001) vii Page 13.5 PSTN call control procedures . 58 13.5.1 General. 5

40、8 13.5.2 Handling of error conditions 59 13.5.3 Path related procedures 64 13.5.4 Non-path related procedures 72 13.5.5 Layer 3 error detection procedure . 74 13.6 List of system parameters . 76 13.7 AN and LE side state tables 78 14 Control requirements and protocol . 88 14.1 ISDN user port status

41、indication and control protocol . 88 14.1.1 General aspects 88 14.1.2 Events and function elements relevant for the control of the state machines 89 14.1.3 ISDN user port FSMs, AN(ISDN port) and LE(ISDN port). 93 14.1.4 Performance Monitoring aspects . 103 14.2 PSTN user port status indication and c

42、ontrol protocol. 103 14.2.1 General aspects 103 14.2.2 Events and function elements relevant for the control of the state machines 104 14.2.3 PSTN user port FSM, AN(PSTN port) and LE(PSTN port) . 105 14.3 Interface layer 1 maintenance requirements and protocol 109 14.3.1 Events and failure reports 1

43、09 14.3.2 Detection algorithm for events and signals . 109 14.3.3 V5.1-interface layer 1 FSM. 110 14.3.4 Requirements and procedures for the additional functions . 111 14.4 Control protocol 112 14.4.1 Control protocol message definition and content 112 14.4.2 General message format and information e

44、lement coding 114 14.4.3 State definitions of the control protocol 121 14.4.4 Control protocol procedures 121 14.5 V5.1-re-provisioning procedures 129 14.5.1 General aspects 129 14.5.2 Events and states 129 14.5.3 Re-provisioning FSMs. 130 14.5.4 Procedures . 132 ANNEX A Service scenarios, architect

45、ure and functional definition of access arrangements with an AN at the LE. 134 A.1 Conclusions on multiple V5-interface applications 134 viii ITU-T G.964 (03/2001) Page A.2 Conclusions on architecture aspects . 135 A.3 Implementation of QAN . 135 A.4 Requirements for the support of the PL capability

46、 through an ISDN basic access 136 A.5 Assumptions and requirements for the support of semi-permanent leased lines 136 A.5.1 General. 136 A.5.2 Signalling associated to semi-permanent leased lines. 136 A.5.3 User ports. 136 A.5.4 Requirements for non-ISDN user ports for semi-permanent leased lines .

47、137 ANNEX B Use of the protocol information elements for national PSTN protocols 137 B.1 Introduction. 137 B.2 The placement of information elements . 139 B.2.1 Information elements within the ESTABLISH message. 139 B.2.2 Information elements within the ESTABLISH ACK message . 139 B.2.3 Information

48、elements within the SIGNAL message 139 B.2.4 Information elements within the DISCONNECT message. 140 B.2.5 Information elements within the DISCONNECT COMPLETE message. 140 B.2.6 Information elements within the PROTOCOL PARAMETER message 140 B.3 The information elements . 141 B.3.1 Line-information i

49、nformation elements. 141 B.3.2 Pulse-notification information element . 141 B.3.3 Autonomous-signalling-sequence information element 142 B.3.4 Sequence-response information element. 142 B.3.5 Cadenced-ringing information element. 142 B.3.6 Pulsed-signal information element 142 B.3.7 Use of Pulsed-signals. 144 B.3.8 Use of Steady-signals 146 B.3.9 Digit-signal information element. 148 B.3.10 Recognition-time information element 148 B.3.11 Enable-autonomous-acknowledge information element . 148 B.3.12 Default values fo