1、 STDmITU-T RECMN J.333-ENGL 3778 W 4862573 Ob53707 5bb INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 5.131 (03/98) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Transport of MPEG-2 signais on packetised networks Trans
2、port of MPEG-2 signals in PDH networks ITU-T Recommendation JA 31 (Previously CCITT Recommendation) STD-ITU-T RECMN JoL3L-ENGL 1998 = 486259L Ob51708 4T2 = ITU-T J-SEMES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations General specifica
3、tions for analogue sound-programme transmission Performance characteristics of analogue sound-programme circuits Equipment and lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme signals Digital transmission of sound-programme signais Circuits for analogue
4、television transmission Analogue television transmission over metallic lines and interconnection with radio-relay links Digital transmission of television signals Ancillary digital services for television transmission Operational requirements and methods for television transmission Interactive svste
5、ms for digital television distribution J. 1-J.9 J.10-J.19 J.20-J.29 J.30-J.39 J.40-J.49 J.50-J.59 J .60-J. 69 5.70-5.79 J. 80-J.89 J.90-J.99 J.100-J.109 J.110-5.129 “ Transport of MPEEZ signals on packetised networks 5.130-5.139 Measurement of the quality of service Digital television distribution t
6、hrough local subscriber networks J. 140-J.149 J.150-J.159 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECVN J-333-ENGL 1998 4862593 Ob53309 337 ITU-T RECOMMENDATION 5.131 TRANSPORT OF MPEG-2 SIGNALS IN PDH NETWORKS Summary This Recommendation provides the requiremen
7、ts for equipment called “PDH network adapter“ for the transport of MPEG-2 signals over PDH networks. It describes the necessary operations to adapt the WEG-2 Transport Stream into interfaces of PDH networks and the functional characteristics associated with this equipment. Source ITU-T Recommendatio
8、n J.131 was prepared by ITU-T Study Group 9 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 18th of March 1998. Recommendation 5.131 (03198) 1 FOREWORD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- catio
9、ns. The IT Telecommunication Standardization Sector (ITU-T) is a permanent organ of the IT. 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. The World Telecommunic
10、ation Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their tum, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Re
11、solution 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 telecommunication administ
12、ration 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 evidence, validity or ap
13、plicability 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, which may be required t
14、o 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 IT 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any
15、means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation 5.131 (03198) CONTENTS 1 Scope 2 References 3 Terms and definitions . 4 Acronyms and abbreviations 5 Conventions 6 Network adapter overview 6.1 Functional descnption .
16、 Detailed description of the basic functions . 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 MPEG Physical Interface (MPI) . 7.1.1 Basic characteristics 7.1.2 Additional characteristics for System A (European system) . 7.2.1 Signal processing in the transmitter (Signal flow from b to c in Figure 1) . 7.2.2 Sign
17、al processing in the receiver (Signal flow from c to b in Figure 1) Virtual Path Entity (VPE) . 7.3.1 Signai processing in the transmitter (Signal flow from c to d in Figure 1) . 7.3.2 Signal processing in the receiver (Signal flow ffom dto c in Figure 1) Virtual Path Multiplexing Entity (VPME) 7.4.
18、1 Signal processing in the transmitter (Signal flow from d to e in Figure 1) . 7.4.2 PDH Path Layer Trail Termination (Pqs-TT) . PDH Physical Section Layer to PDH Path Layer Adaptation (EqPqs-A) . PDH Physical Section Layer Trail Termination (Eq-TT) . Equipment Management Function (EMF) 7.8.1 Overvi
19、ew of the EMF 7.8.2 Configuration 7.8.3 Fault (maintenance) management MPEG/ATM Adaptation (MAA) Signal processing in the receiver (Signal flow from e to d in Figure i) 7.8.4 Performance management . Appendix 1 . Mechanisms of the adaptive clock method . Appendix II - Enabling/disabling the Header E
20、rror Control functions Appendix III - Transmission capacity ofthe Network Adapter . Recommendation 5.131 (03/98) Page 1 1 2 2 3 3 3 5 5 5 7 8 9 10 11 11 12 12 13 13 14 15 15 16 16 17 17 18 21 22 22 . 111 STD-ITU-T RECMN J.131-ENGL 1998 48b2591 Ob51712 923 Recommendation 5.131 TRANSPORT OF MPEG-2 SIG
21、NALS IN PDH NETWORKS (Geneva, 1998) 1 Scope This Recommendation specifies the transmission of MPEG-2 transport streams within PDH networks working at the Recommendation G.702 i hierarchical bit rates of 1544 kbits, 2048 kbits, 6312 kbits, 34368 kbits, 44 736 kbit/s and 139264 kbits. The use of any o
22、f these bit rates is optional; if, however, one or more rates are selected, the complete specification applies. The definition of the network aspects of the transmission of MPEG-2 Transport Streams is based to the maximum extent on existing international standards. The 8 Mbits fiame structure for th
23、e support of ATM is not yet defined. Further study is required. The equipment considered in this Recommendation is the Network Adapter performing the adaptation between MPEG-2 transport streams and the interfaces of PDH networks. The application of this Recommendation is restricted to a physical lay
24、er point-to-point connection without ATM connection functionality at intermediate points. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the edit
25、ions indicated are valid. All Recommendations and other references are subject to revisions; all users of this Recommendation 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
26、valid ITU-T Recommendations is regularly published. CCITT Recommendation G.702 (1988), Digital hierarchy bit rates. CCITT Recommendation G.703 (199 i), Physical/electrical characteristics of hierarchical digital interfaces. ITU-T Recommendation G.783 (1997), Characteristics of Synchronous Digital Hi
27、erarchy (SDH) equipment functional blocks. ITWT Recommendation G.804 (1998), ATM cell mapping into Plesiochronous Digital Hierarchy (PDH). ITU-T Recommendation G.826 ( 1996), Error performance parameters and objectives for international, constant bit rate digital paths at or above the primary rate.
28、ITU-T Recommendation G.832 (1995), Transport of SDH elements on PDH networks - Frame and multiplexing structure. ITU-T Recommendation H.222.0 (1995) 1 ISO/IEC 1381 8-1: 1996, Information technology - Generic coding of moving pictures and associated audio information: Systems. ITU-T Recommendation 1.
29、361 (1995), B-ISDN ATM layer specification. ITU-T Recommendation 1.363.1 (1996), B-ISDNATMadaptation layer (AAL) specification - Type I AAL. ITU-T Recommendation 1.432 (1 993), B-ISDN user-network interface - Physical layer specification. ITU-T Recommendation 1.732 (1 996), Functional characteristic
30、s of ATMequipment. Recommendation 5.131 (03/98) 1 STD-ITU-T RECMN J.23L-ENGL 1778 4862572 Ob5L7L3 8bT ITU-T Recommendation J.82 (1996), Transport of WEG-2 constant bit rate television signals in B-ISDN. IT-T Recommendation J.83 ( 1997), Digital multi-programme systems for television, sound and data
31、services for cable distribution. ITU-T Recommendation M.2120 (1997), Digital paths, section and transmission system fault detection and localization procedures. ITU-T Recommendation 4.822 (1994), Stage 1, stage 2 und stage 3 description for the Q3 interface - Performance management. ETS 300 417-2-1
32、(1997), Transmission and Multiplexing (TM), Generic requirements of transport fitnction- ali of equipment; Part 2-1: Synchronous Digital Hierarchy (SDH) and Plesochronous Digital Hierarchy (PDH) physical section layer functions. ETS 300 417-5-1 (1998), Transmission and Multiplexing (TM), Generic req
33、uirements of transport function- ality of equipment; Part 5-1: PDHpath layer fitnctions. ETR 290 (1997), Digital Video Broadcasting (DVB); Measurement guidelines for DVB systems. EN 50083-9 (1998), Cabled distribution systems for television, sound and interactive multimedia signals; Part 9: Interfac
34、es for CATVXM TV headends and similar professional equipment for D VB/MPEG-L transport sireams. ANSI T1.102 (1993), Telecommunications - Digital Hierarchy - Electrical Interfaces. IT-T Recommendation G.704 (1995), Synchronous fiurne structures used at 1544, 6312, 2048, 8448 and 44 736 kbith hierarch
35、ical levels. Terms and definitions This Recommendation defines the following terms. 3.1 fixed stuff Bytes that are used to fill up unused data positions. 3.2 header information. The header contains MPEG-related data. MPEG-2 Transport Stream (TS) packet: A data packet possessing a length of 188 bytes
36、 including 4 bytes of 3.3 RS-coded MPEG-2 Transport Stream (TS) packet: A data packet possessing a length of 204 bytes. Bytes 1 to 188 contain an MPEG-2 transport stream packet. Bytes 189 to 204 contain the parity-check bytes for the error correction of the preceding bytes of this packet. These pari
37、ty-check bytes are generated using a shortened Reed Solomon Code RS (204, 188), as specified in Annex AlJ.83 131. 4 Acronyms and abbreviations This Recommendation uses the following abbreviations: AAL ATM Adaptation Layer AS I Asynchronous Serial Interface ATM Asynchronous Transfer Mode BER Bit Erro
38、r Rate CRC Cyclic Redundancy Check cs Convergence Sublayer DVB Digital Video Broadcasting 2 Recommendation 5.131 (03/98) EMF FAS FEC LOF LOS MAA MON MPEG MPEG-2-TS MPI NE PDH PDU PL PPI PPT PSL RDI RS SAP SAR SN SPI SSI TS VP VPE VPME Equipment Management Function Frame Alignment Signal Forward Erro
39、r Correction Loss of Frame Loss of Signal MPEG/ATM Adaptation Monitoring Moving Pictures Experts Group MPEG-2 Transport Stream MPEG Physical Interface Network Element Plesiochronous Digital Hierarchy Protocol Data Unit Path Layer PDH Physical Interface PDH Path Termination Physical Section Layer Rem
40、ote Defect Indication Reed Solomon Service Access Point Segmentation and Reassembly sublayer Sequence Number Synchronous Parallel Interface Synchronous Serial Interface Transport Stream Virtual Path Virtual Path Entity Virtual Path Multiplexing Entity 5 Conventions Unless otherwise mentioned, in thi
41、s Recommendation the following conventions hold true: - The order of transmission of information in all diagrams is first from left to right and then from top to bottom. Within each byte or octet the most significant bit is transmitted first. 6 Network adapter overview 6.1 Functional description The
42、 Network Adapter is an equipment which performs the adaptation of data structured as an MPEG-2 Transport Stream to the characteristics of a PDH link. The solution selected for the transmission of MPEG-2-TS packets, or optionally for the transmission of RS-coded MPEG-2-TS packets, over PDH links is b
43、ased on the use of ATM cells. Therefore, the adaptation of the transport of an MPEG-2-TS basically consists in: - - NOTE -The processing of ATM VC level is not performed. adaptation of MPEG-2-TS packets or RS-coded MPEG-2-TS packets to ATM cells; adaptation of ATM cells to PDH framing. Recommendatio
44、n 5.131 (03/98) 3 STD-ITU-T RECMN J-131-ENGL 1998 4Bb259L Ob51715 632 The normative references applicable to the adaptation unless specifically mentioned are given here below: - the adaptation of MPEG-2-TS packets into ATM cells using an AAL type 1 shall be performed as described in Recommendation J
45、.82 12. AAL type 1 is specified in Recommendation 1.363.1 9, the ATM layer is specified in Recommendation 1.361 8; - the adaptation of ATM cells into PDH framing shall be performed as described in Recommendation G.804 4. There is no normative reference for the adaptation of RS-coded MPEG-2-TS packet
46、s to ATM cells. This adaptation shall be performed as described in Recommendation 5.82 12 for MPEG-2-TS packets, with the only exception that the RS-coded MPEG-2-TS packets are not aligned with the structure of the AAL1 interleaving matrix. The Network Adapter is described as a group of functional b
47、locks. The partitioning into functional blocks is based on existing Recommendations on SDH equipment (Recommendation (3.783 3) and ATM equipment (Recommen- dation 1.732 1 i). The equipment consists of the following blocks (see also Figure 1): - MPEG Physical Interface (MPI); - MPEGIATM Adaptation (M
48、AA); - Virtual Path Entity (VPE); - VP Multiplexing Entity (VPME); - PDH Path Layer Trail Termination (Pqs-TT); - PDH Physical Section Layer to PDH Path Layer Adaptation (EqPqs-A); - PDH Physical Section Layer Trail Termination (Eq-TT); and - Equipment Management Function (EMF). The present descript
49、ion is a functional description and does not imply any specific equipment implementation but it allows for the implementation of a separate transmitter and receiver as well as a combined transmitterheceiver. MPI MPEGI interface MPEG Physical Interface ATM H PDH PL Entity Termination All functional blocks 4 Equipment Management Function NOTE - Synchronization functions are for further study. I PDHPSL I IPDH PSL to PDH PL Trail Adaptation Termination + PDH interface L -. TO905640-97/dO 1 Figure 1/5.131- Functional blocks for the Network Adapter 4 Rec
