1、STD-ITU-T RECMN 1-432-3-ENGL 1999 48b259L Ob57297 b07 INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU SERIES I: INTEGRATED SERVICES DIGITAL NETWORK ISDN user-network interfaces - Layer 1 Recommendations 1.432.3 (02199) B-ISDN user-network interface - Physi
2、cal layer specification: 1544 kbitk and 2048 kbits operation ITU-T Recommendation 1.432.3 (Previously CCITT Recommendation) ITU-T I-SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK ;ENERAL STRUCTURE Terminology Description of ISDNs General modelling methods Telecommunication network and se
3、rvice attributes General description of asynchronous transfer mode Scope General aspects of services in ISDN Common aspects of services in the ISDN Bearer services supported by an ISDN Teleservices supported by an ISDN Supplementary services in ISDN Network functional principles Reference models Num
4、bering, addressing and routing Connection types Performance objectives Protocol layer requirements General network requirements and functions Application of I-series Recommendations to ISDN user-network interfaces ;ERVICE CAPABILITIES IVERALL NETWORK ASPECTS AND FUNCTIONS ISDN USER-NETWORK INTERFACE
5、S 1.110-1.119 I. 1204.129 I. I 30-1.1 39 I. 140-1.149 I. 1 50-1.1 99 1.200-1.209 I .2 I 0-1.2 1 9 I .220-1.229 I .230-1.239 I .240-1.249 1.250-1.299 1.31 0-1.31 9 I. 3204.329 1.330-1.339 I. 340-1.349 1.350-1.359 I. 3604.369 I. 3704.399 1.420-1.429 Layer i Recommendations 1.430-1.439 Layer 2 Recommen
6、dations Layer 3 Recommendations Multiplexing, rate adaption and support of existing interfaces Aspects of ISDN affecting terminal requirements INTERNETWORK INTERFACES MAINTENANCE PRINCIPLES B-ISDN EQUIPMENT ASPECTS ATM equipment Transport functions Management of ATM equipment 1.440-1.449 1.450-1.459
7、 1.460-1.469 1.470-1.499 I. 500-1.599 1.600-1.699 I .730-1.739 1.740-1.749 I .750-1.799 For further details, please refer to ITU-T List of Recommendations. B-ISDN USER-NETWORK INTERFACE - PHYSICAL LAYER SPECIFICATION 1544 kbit/s AND 2048 kbith OPERATION Summary This Recommendation covers Physical La
8、yer characteristics for transporting ATM cells using existing Primary Rate ISDN systems. It includes both 1544 and 2048 kbit/s interfaces at the T, and S, reference points of the B-ISDN User-Network Interface (UNI). These Physical Layer characteristics may be used to take advantage of existing trans
9、mission equipment and building wiring. This Recommendation is part of the 1.432-series, and includes references to Recommendation 1.432.1 on general characteristics, and Recommendation 1.432.2 on OAM aspects. Source ITU-T Recommendation 1.432.3 was prepared by ITU-T Study Group 13 (1997-2000) and wa
10、s approved under the WTSC Resolution No. 1 procedure on the 15h of February 1999, Keywords ATM, B-ISDN, UNI, User-Network Interface. Recommendation 1.432.3 (02/99) 1 STD-ITU-T RECMN 1-432=3-ENGL 1999 4862593 Ob57300 T2L FOREWORD ITU (International Telecommunication Union) is the United Nations Speci
11、alized Agency in the field of telecommunications. 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 telecommunicati
12、ons on a worldwide basis. 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
13、 is covered by the procedure 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 term recognized operating agency (ROA) includes a
14、ny individual, company, corporation or governmental organization that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined in the Constitution ofthe ITU (Geneva, 1992). INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility th
15、at the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The 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 Recomm
16、endation development process. As of the date of approval of this Recommendation, the 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 informat
17、ion and are therefore strongly urged to consult the TSB patent database. O ITU 1999 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 the ITU.
18、Recommendation 1.432.3 (02/99) 11 1 2 3 4 4.1 4.2 5 6 6.1 6.2 6.3 7 7.1 7.2 7.3 STD-ITU-T RECMN 1-432.3-ENGL 1999 I 4862591 Ob57301 Yb8 I CONTENTS Scope Background . References Definitions and abbreviations . Definitions Abbreviations . Reference configuration . Interface at 1544 kbit/s for ATM Char
19、acteristics of the Physical Media Dependent (PMD) sublayer . Functions provided by the Transmission Convergence (TC) sublayer 6.2.2 Transfer capability . 6.2.3 Transport-specific TC functions 6.2.4 ATM-specific TC functions Power feeding . Interface at 2048 kbits for ATM Characteristics of the Physi
20、cal Media Dependent (PMD) sublayer . Functions provided by the Transmission Convergence (TC) sublayer 6.2.1 Bit rate . 6.2.5 OAM specific functions 7.2.1 Bit rate . 7.2.2 Transfer capability . 7.2.3 Transport-specific TC functions 7.2.4 ATM-specific TC functions 7.2.5 OAM specific functions Power fe
21、eding . Page 1 1 1 2 2 2 2 2 2 2 2 3 3 3 4 4 4 4 4 4 4 4 4 6 11 . Recommendation 1.432.3 (0299) 111 Recommendation 1.432.3 B-ISDN USER-NETWORK INTERFACE - PHYSICAL LAYER SPECIFICATION: 1544 kbit/s AND 2048 kbit/s OPERATION (Geneva, 1999) 1 Scope This Recommendation covers Physical Layer characterist
22、ics for transporting ATM cells using existing Primary Rate ISDN systems. It includes both 1544 and 2048 kbit/s interfaces at the T, and S, reference points of the B-ISDN User-Network Interface (UNI). Functionality is presented in terms of physical media dependent and transmission convergence sublay
23、ers. 2 Background This Recommendation is part of the 1.432-series, and contains those characteristics that are specific to transmission systems operating at 1544 kbit/s and 2048 kbit/s. It should be used in conjunction with Recommendation 1.432.1 on general characteristics which treats material rele
24、vant to all B-ISDN transmission systems at the UNI. These Physical Layer characteristics may be used to take advantage of existing transmission equipment and building wiring. Information on other bit rates can be found in other Recommendations of the 1.432-series. 3 References The following ITU-T Re
25、commendations and other references 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
26、 are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation 1.43 1 (1 993), Primary rate user-network interface
27、- Layer 1 specification. ITU-T Recommendation 1.361 (1995), B-ISDNATMlayer specification. ITU-T Recommendation G.804 (1 998), ATM cell mapping into plesiochronous digital hierarchy (PDH). ITU-T Recommendation G.704 (1 998), Synchronous fiame structures used at I544 63 12, 2048, 8488 and 44 736 kbitl
28、s hierarchical levels. CCITT Recommendation G.706 (1 99 i), Frame alignment and cyclic redundancy check (CRC) procedures relating to basic fiame structures dejhed in Recommendation G. 704. CCITT Recommendation M.3604 (1 992), Application of maintenance principles to ISDN primary rate access. ITU-T R
29、ecommendation 1.432.1 (1 999), B-ISDN user-network interface - Physical layer specijkations: General characteristics. Recommendation 1.432.3 (02/99) 1 STD-ITU-T RECMN 1-432-3-ENGL 1999 48b2591 Ob57303 730 4 Definitions and abbreviations 4.1 Definitions None. 4.2 Abbreviations This Recommendation use
30、s the following abbreviations: ATM Asynchronous Transfer Mode B -ET Broadband Exchange Termination B-NT1 Broadband Network Termination 1 B-NT2 Broadband Network Termination 2 B-TE Broadband Terminal Equipment CRC Cyclic Redundancy Check LCD Loss of Cell Delineation LOF Loss Of Frame LOS Loss Of Sign
31、al OAM Operations, Administration and Maintenance OCD Out of Cell Delineation PMD Physical Medium Dependent RAI Remote Alarm Indication TC Transmission Convergence UNI User-Network Interface 5 Reference configuration Refer to Recommendation 1.432.1 7. 6 This clause describes the Physical Layer chara
32、cteristics for 1544 kbit/s for transporting ATM cells at the User-Network Interface, according to the reference configuration described in Recommendation 1.432.1. It covers the Physical Layer characteristics at the T, and S, reference points. Interface at 1544 kbit/s for ATM 6.1 The PMD characterist
33、ics are as described in Recommendation 1.43 1 i. Characteristics of the Physical Media Dependent (PMD) sublayer 6.2 6.2.1 Bit rate The interface bit rate at the T, and S, reference point is 1544 kbit/s. Functions provided by the Transmission Convergence (TC) sublayer 2 Recommendation 1.432.3 (02/99)
34、 STDgITU-T RECMN 1-432-3-ENGL L 48b259L Ob57304 b77 I 6.2.2 Transfer capability The transport capability available for the ATM cells (user information cells, signalling cells, OAM cells and cells used for cell rate decoupling) excluding Physical Layer overhead cells is 1536 kbit/s. 6.2.3 Transport-s
35、pecific TC functions The frame format is as defined in Recommendation 1.43 1 13. 6.2.4 ATM-specific TC functions 6.2.4.1 ATM cell format The ATM cell format is as described in Recommendation 1.361 2. 6.2.4.2 Mapping of ATM cells ATM cells are directly mapped into the fi-ame structure according to Re
36、commendation G.804 3. The cells are octet-aligned in the fiame structure. See Figure 1. F bit 24-octet payload 193 bits 8 kHz frame octet ATM ceil Figure 1D.432.3 - ATM cell mapping into the 1544 kbit/s frame structure 6.2.4.3 Header error control Refer to Recommendation 1.432.1 7. 6.2.4.4 Cell deli
37、neation Refer to Recommendation 1.432.1 7. 6.2.4.5 Scrambling This interface does not use the self-synchronizing scrambler that is described in Recommendation 1.432.1. 6.2.4.6 Idle cells Refer to Recommendation 1.432.1 7. Recommendation 1.432.3 (02/99) 3 6.2.5 OAM specific functions The OAM operatio
38、nal functionality described in 6.111.432.2 should be implemented as applicable, using the signals described in 4.7.3/I.43 1 i with the following exceptions: - - there is no distinction between Section and Path; the RDI function is implemented using the RAI signal according to Recommendation G.704 4;
39、 the performance monitoring functionality is implemented using the CRC-6 procedure as defined in Recommendation G.706 SI. - Additional maintenance functions are specified in Recommendation 1.43 1 i. Maintenance state tables are for further study. 6.3 Power feeding Refer to Recommendation 1.43 1 i. 7
40、 This clause describes the Physical Layer characteristics for 2048 kbit/s for transporting ATM cells at the User-Network Interface, according to the reference configuration described in Recommendation 1.432.1. It covers the Physical Layer characteristics at the T, and S, reference points. Interface
41、at 2048 kbit/s for ATM 7.1 The PMD characteristics are as described in Recommendation 1.43 1 i. Characteristics of the Physical Media Dependent (PMD) sublayer 7.2 Functions provided by the Transmission Convergence (TC) sublayer 7.2.1 Bit rate The interface bit rate at the TB and S, reference points
42、is 2048 kbit/s. 7.2.2 Transfer capability The transfer capability available for the ATM cells (user information cells, signalling cells, OAM cells and cells used for cell rate decoupling) excluding Physical Layer overhead cells is 1920 kbit/s. 7.2.3 Transport-specific TC functions The frame format i
43、s as defined in Recommendation 1.43 1 i. 7.2.4 ATM-specific TC functions 7.2.4.1 ATM cell format The ATM cell format is as described in Recommendation 1.361 2. 7.2.4.2 Mapping of ATM cells ATM cells are directly mapped into the frame structure according to Recommendation G.804 3. The cells are octet
44、-aligned in the frame structure. Time Slot O (TSO) is used for OAM functions, TS16 is not used in this interface. TS1 to TS15 and TS17 to TS31 are used to transport the ATM cells (30 octetdl25 ps). See Figure 2. 4 Recommendation 1.432.3 (02/99) STD-ITU-T RECMN 1-432-3-ENGL L777 I 4862591 Ob57306 44T
45、 m 18 TSO TSO TSO TSO TSO 9.128 129 . 136 137 256 I Header I TS16 TS16 I Header I TS16 TS16 I Header I TS16 7.2.4.3 Header error control Refer to Recommendation 1.432.1 7. 7.2.4.4 Cell delineation Refer to Recommendation 1.432.1 7. For 2048 kbit/s, the Out of Cell Delineation (OCD) anomaly persisten
46、ce time, defined as the time before the state change from OCD to Loss of Cell Delineation (LCD) will be forced, should be 50 ms. A LCD defect terminates as soon as possible after the cell delineation process enters and remains in the Sync state. (See Figure 3.) Note 3 state anomaly defect I I Note 4
47、 I TI 31 4940-98 NOTE 1 - Triggered by state transition (Case A - State change from SYNC to HUNT) due to alpha consecutive incorrect HECs in the cell delineation process. (See Figure 5D.432.1 7.) NOTE 2 -Triggered by state transition (Case B - State change from PRESYNC to SYNC) due to delta consecut
48、ive correct HECs in the cell delineation process. (See Figure 511.432.1 171.) NOTE 3 - Triggered by 50 continuous ms in the OCD anomaly maintenance state. NOTE 4 - Triggered as soon as possible after entering and remaining in the cell delineation “Sync“ state (See Figure 5iL432.1 7.) Figure 3D.432.3
49、 - Maintenance state transition diagram for cell delineation events 7.2.4.5 Scrambling x43 + 1 scrambling function is used for ATM cells, as indicated in Recommendation 1.432.1 7. 7.2.4.6 Idle cells Refer to Recommendation 1.432.1 7. Recommendation 1.432.3 (02/99) 5 STDmITU-T RECMN 1*432-3-ENGL Lqq9 4862593 Ob57307 386 B-NTY b 7.2.5 OAM specific functions This subclause applies for broadband access configurations that provide transmission path continuity between B-NT2/B-TE and B-ET. The more general case including ATM cross-connec
