1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0100509.1995(R2013) Packetized Circuit Multiplication Equipment Interface Specification As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-pressing bus
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5、ormation, visit. AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board o
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8、 standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the
9、 American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American Nation
10、al Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer their exis
11、tence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no cir
12、cumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be ad- dressed to the s
13、ecretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw
14、 this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036 Copyright 0 1995 by Alliance fo
15、r Telecommunications Industry Solutions All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America APS2.5C5951150 ANSI T1.509-1995 American
16、National Standard for Telecommunications - Packetized Circuit Multiplication Equipment - Interface Specification Secretariat Alliance for Telecommunications Industry Solutions , Approved January 12, 1995 American National Standards Institute, Inc. Abstract The purpose of this American National Stand
17、ard is to standardize the interface to packetized cir- cuit multiplication equipment (PMCE). PMCE converts speech, voiceband data, facsimile, chan- nel-associated (i.e., in-band) signaling, common-channel signaling, video, and digital data infor- mation from channelized DSl or Synchronous Optical Ne
18、twork (SONET) formats to LAPD-like frame format. A PCME is one application of Wideband packet technology. This technology refers to packet sys- tems operating at 1.5 Mbit/s to 150 Mbit/s. Tl.PCME defines procedures and interface standards to allow vendors to provide compatible equipment for the US m
19、arketplace and to permit both exchange and interexchange carriers to operate compatibly. Contents Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Scope, purpose, and application . Normative references Definitions and abbreviations General considerations of packetized circuit multiplication equipment . Interfaces . Voiceband processi
21、ng . . . . Video processing . . . . . . . . Interface with cellular speech packetization networks . . . Digital data interface . . . Digital circuit emulation (DICE) protocol . Virtual data link capability (VDLC) Interface with LAPD . . . . . . . Interface with V.120 . . Signaling transport . . . .
22、. . . Facsimile demodulation and compression protocol . . . . . . . . Testing of the link . . . . . . . . Permanent virtual circuit restoration . . . . Packet stream backup . . . Generation of the alarm indication signal . . . . . . Data collection . . . . . . . . Congestion control . . . . . . . .
23、. Dynamic load control . . . . . . . . . Interface with Q.922 frame relay networks . Synchronization . . . . Annex A Performance considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. B Augmented protocol specification language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Page iv 1 2 4 6 10 11 12 12 12 12 24 36 36 37 41 81 84 88 90 90 91 102 102 102 103 105 C Formal description of the digital circuit emulation protocol (DI
25、CE). 109 D Formal description of the virtual data link capability (VDLC) protocol ; . 159 E Formal description of the facsimile demodulation compression protocol (FADCOMP). . 223 F Bibliography . 291 . . . III Foreword (This foreword is not part of American National Standard T1.509-1995.) Contempora
26、ry transmission techniques are evolving according to three scenarios. In the first scenario, the various types of traffic are treated in a homogeneous manner with respect to transmission and switching. The second scenario calls for augmenting the number of available paths with- out affecting service
27、 quality by time division techniques. Finally, in the third scenario, which is often associated with the increasing digitization of networks, the information is packetized before transmission. Wideband Packet Technology is founded on the three scenarios simultane- ously. Although packet transmission
28、 is not new, the originality of the new approach resides in routing over the same path the digital signals corre- sponding to services of a different nature (speech, voiceband data, facsimile, signaling, etc.). Packetized circuit multiplication equipment (PCME), there- fore, uses the techniques avai
29、lable for digital circuit multiplication, packet networks, and frame relay networks to transport a variety of traffic types. The purpose of this American National Standard is to standardize the interfaces to PCME so that vendors can provide internetworking units for the United States and the interna
30、tional marketplace. Additionally, both exchange and interexchange carriers may be assured of compatible net- work interfaces and specific functional compatibilities. It is expected that both manufacturers and carriers will utilize this standard. This standard is new; it does not replace, revise, or
31、supplement any exist- ing North American standard for PCME system interface or functional requirements. There are six annexes to this standard. The first annex is normative; the others are informative, and are not considered part of this standard. Suggestions for improvement of this standard are wel
32、come. They should be sent to the Tl Secretariat, c/o Alliance for Telecommunications Industry Solutions, 1200 G Street, NW, Suite 500, Washington, DC 20005. This standard was processed and approved for submittal to ANSI by Accredited Standards Committee on Telecommunications, Tl. Committee approval
33、of the standard does not necessarily imply that all members voted for its approval. At the time it approved this standard, the Tl com- mittee had the following members: A. K. Reilly, Chairman G. H. Peterson, Vice-Chairman 0. J. Gusella, Jr., Secretary B. Lerich, Senior Editor M. Sharif, Technical Ed
34、itor R. Wright, Technical Editor Organization Represented Name of Representative EXCHANGE CARRIERS Ameritech Services, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Laurence A. Young Peter K. Center (Alt.) Bell Atlantic Corporation . . .
35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . John W. Seazholtz Roger Nucho (AIL) Bellcore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D.
36、 S. Jordan James C. Staats (Alt.) iv Organization Represented Name of Representative BellSouth Telecommunications, Inc. Leonard Strickland, Jr. William J. McNamara, III (Alt.) Centel Corporation Bruce Becker Cincinnati Bell Telephone William P. Keidel Kevin R. Sullivan (Alt.) Exchange Carriers Stand
37、ards Association. . Joseph Mendoza Gregory L. Theus (Alt.) GTE Telephone Operations . Gregory L. Theus Richard L. Cochran (Alt.) National Telephone Cooperative Association . Joseph M. Flanigan NYNEX . James F. Baskin Jim Papadopoulos (Alt.) Pacific Bell Steve Grimm Sal R. Tesoro (AIL) Puerto Rico Te
38、lephone Company . Segundo Ruiz Albert0 E. Morales (Alt.) Southwestern Bell Corporation Joseph Mendoza C. C. Bailey (AIL) Sprint - Local Telecommunications Division . Robert P. McCabe Harold L. Fuller (Alt.) US WEST James L. Eitel James Dahl (Alt.) GENERAL INTEREST Ashford Associates Donald A. Ashfor
39、d Base-2 Systems, Inc Douglas M. Brady BT North America, Inc. Richard A. Rawson Michel J. Darnaud (Alt.) C.S.I. Telecommunications Michael S. Newman Cable Television Labs, Inc . Stephen D. Dukes James S. Meditch (Alt.) Capital Cities/ABC, Inc. . Warner W. Johnston Creative Communications Consulting
40、. Richard Bobilin James Boe (AIL) Defense Information Systems Agency C. Joseph Pasquariello Granger Kelley (Alt.) GTE Mobile Communications . John C. Chiang Steve Pankow (Alt.) International Communications Association . Edward F. Bonkowski Robert M. Eilers (Alt.) National Communications System Denni
41、s Bodson Frank M. McClelland (Ah.) National Institute of Standards and Technology Robert Rountree, Jr. Michael D. Hogan (Alt.) National Telecommunications and Information Administration/Institute for Telecommunication Sciences (NTIA/ITS). . William F. Utlaut Neal B. Seitz (Alt.) NTT America, Inc. .
42、Hideo Yamamoto Naobumi Kanemaki (Alt.) Rural Electrification Administration Donald M. Van Bellinger George J. Bagnall (Alt.) U. S. General Services Administration . Douglas K. Arai Larry L. Jackson (Alt.) Interexchange Carriers American Mobile Satellite Corporation . Michael K. Ward William Garner (
43、AIL) AT - implementation and applications con- siderations. 1.2 Purpose This standard covers the following interface and functional requirements for PCME: - interface requirements (network-network and user-network), including - interface with Link Access Procedure D- Channel (LAPD); - interface with
44、 DSO-A circuits; - interface with V.120; - interface with cellular speech packetiza- tion networks and systems; - signaling interfaces; - Pulse Code Modulation (PCM)/Adaptive Differential Pulse Code Modulation (ADPCM); code switching for voiceband traffic; PCME converts speech, voiceband data, fac-
45、simile, channel-associated (i.e., in-band) signal- ing, common-channel signaling, video, and digital data information from channelized DSl or Syn- chronous Optical Network (SONET) formats to LAPD-like frame format. The LAPD-like frames are transported as packet streams in a wideband packet network o
46、ver a full or fractional DSl, or a SONET virtual tributary. Wideband packet technology, as used herein, refers to packet systems operating at 1.5 Mbit/s to 150 Mbit/s. To streamline processing and to limit delay so as to accommodate voice, voiceband data, facsimile and video, this technol- ogy uses
47、a LAPD-like link layer protocol with unacknowledged operation and application- specific layer 3 protocols. Digital data transmis- sion is supported by several layer 3 protocols, as explained in this document. - PCM encoding standards conversion. 1.3 Application - functional requirements, including -
48、 build-out delay, echo control; - congestion control strategy; - maintenance and alarm functions; - testing procedures. Wideband packet technology can be applied in public or private networks, virtual private net- works, and satellite networks to achieve the fol- lowing benefits: - better utilizatio
49、n of long-haul digital lines by implementing low-bit-rate voice coding, silence elimination, and variable-bit-rate video coding; 1 - networking applications including - configurations; requirements, ANSI T1.509-1995 - efficient sharing of the same network among voice, voiceband data, image, video, and data; - automatic shifting of available transmission capacity between non-coincident traffic loads without time-of-day administrative procedures; -tandem switch relief; - automatic re-routing of traffic around failed links and nodes: - uniform approach to dynamic load control an
