1、 = 4Ab259l Obbblb 927 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU JA50 Amendment I (09/99) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Digital television distribution through local subscriber networks Operational
2、functionalities for the delivery of digital multiprogramme television, sound and data services through multichannel, multipoint distribution systems (MMDS) Amendment I: Additions to Recommendation JA 50 to also encompass local multipoint distribution systems (LMDS) ITU-T Recommendation J.150 - Amend
3、ment 1 (Previously CCITT Recommendation) INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU J.150 Amendment I (09/99) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Digital television distribution through local subscriber n
4、etworks Operational functionalities for the delivery of digital multiprogramme television, sound and data services through multichannel, multipoint distribution systems (MMDS) Amendment I: Additions to Recommendation JA 50 to also encompass local multipoint distribution systems (LMDS) ITU-T Recommen
5、dation J.150 - Amendment 1 (Previously CCITT Recommendation) ITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations General specifications for analogue sound-programme transmission Performance characteristics of analogue sound-
6、programme circuits Equipment and lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme signals Digital transmission of sound-programme signals Circuits for analogue television transmission Analogue television transmission over metallic lines and interconnecti
7、on with radio-relay links Digital transmission of television signals Ancillary digital services for television transmission Operational requirements and methods for television transmission Interactive systems for digital television distribution Transport of WEG-2 signals on packetised networks Measu
8、rement of the quality of service Digital television distribution through local subscriber networks J.1-J.9 J. 10-J. 19 5.20-5.29 J.30-J.39 5.40-5.49 J.50-J.59 J.60-J.69 J.70-J.79 5.80-5.89 J.90-J.99 3.1 00-J. 109 J. 1 10-J. 129 5.130-5.139 J. 140-J. 149 5.1505.1 59 For further details, please refer
9、to ITU-T List of Recommendations. i 48b259B ObbBbL b3b ITU-T RECOMMENDATION J.150 OPERATIONAL FUNCTIONALITIES FOR THE DELIVERY OF DIGITAL MULTIPROGRAMME TELEVISION, SOUND AND DATA SERVICES THROUGH MULTICHANNEL, MULTIPOINT DISTRIBUTION SYSTEMS (MMDS) AMENDMENT 1 Additions to Recommendation 5.150 to a
10、lso encompass local multipoint distribution systems (LMDS) Source Amendment 1 to ITU-T Recommendation J. 150 was prepared by ITU-T Study Group 9 (1 997-2000) and was approved under the WTSC Resolution No. 1 procedure on 16 September 1999. Recommendation J.lSO/Amd.l (09/99) 1 FOREWORD ITU (Internatio
11、nal Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector TU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendati
12、ons on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IT-T Study Groups which, in their turn, produce Recommendations on these topics. The
13、approval of Recommendations by the Members of the ITU-T 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 Recommendatio
14、n, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration 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
15、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 Recommendation development process. As of the date of approval of this Recommendation,
16、 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 information and are therefore strongly urged to consult the TSB patent database. o ITU 2
17、000 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 fiom the ITU. 11 Recommendation J.lSO/Amd.l (09/99) CONTENTS Page 1 i) Clause 2 2) Clause 5 1
18、3) Annex A 1 . Recommendation J.lSO/Amd.l (09/99) 111 D q8b25911 Obb8b22 I120 D Recommendation 5.150 OPERATIONAL FUNCTIONALITIES FOR THE DELIVERY OF DIGITAL MULTIPROGRAMME TELEVISION, SOUND AND DATA SERVICES THROUGH MULTICHANNEL, MULTIPOINT DISTRIBUTION SYSTEMS (MMDS) AMENDMENT 1 Additions to Recomm
19、endation J.150 to also encompass local multipoint distribution systems (LMDS) (Geneva, 1999) 1) Clause 2 The last paragraph of clause 2 should be augmented (as shown with revision marks) to read: 1 Siiecifications can be orovided. that allow MMDS systems to offer the iiossibilitv for an interactive
20、channel. However. it should be noted that this Recommendation deals with downstream signal delivery only; the needs for interactive services requiring both downstream and upstream (return) channels are beyond the scope of this Recommendation. 2) Clause 5 In this clause add the following acronyms: LM
21、DS Local Multipoint Distribution System MVDS Multipoint Video Distribution System OFDM Orthogonal Frequency Division Multiplexing 3) Annex A Annex ALJ. 1 SO should be augmented (as shown with revision marks) to read: Annex A Digital multiprogramme MMDSLMDS System A I A.l Introduction This Annex desc
22、ribes a transmission system known as System A for digital multiprogramme television distribution by MMDS operating below 10 GHz. It is based on the System A of Recommendation 5.83. It uses QAM modulation and allows for 16, 32 and 64 constellation points. A flavour of System A for oiieration at 10 GH
23、z and above also exists: this is normally designated as LMDS (Local Multiuoint Distribution System): its suecifications are derived ?om satellite broadcast television suecifications. The present Annex mainly aiiiilies to System A for operation below 10 GHz; but it also describes System A variations
24、for operation at fiepuencies at 10 GHz and above. Recommendation J.lSO/Amd.l (09/99) 1 - Iib259L Obbb23 Ob7 NOTE - Another variant of System A is an optional MMDSWDSLMDS system usine OFDM modulation. Its fields of application and its suecifications are currently under study. The specifications would
25、 likely be derived from existing digital terrestrial television standards with additional details that apulv to multiuroeramme microwave services. I G.2.1 MMDS system concept The MMDS system shall be defined as the functional block of equipment performing the adaptation of the baseband TV signals to
26、 the MMDS channel characteristics (see Figure A.l). At the transmitter site, the following TV baseband signal sources can be considered: - satellite signal(s); - cable signal(s); - contribution link(s); - local programme source(s). The processes in the following subclauses shall be applied as shown
27、in Figure A. 1. - baseband interfacing and synchronization; - synchronization 1 inversion and randomization; - Reed-Solomon encoding; - convolutional interleaving; - byte-to m-tuple conversion; - differential encoding. All these functions are identical to those defmed in Annex pJJ.83. - Baseband sha
28、ping Similar to the 5.83 System A, this unit performs mapping from differentially encoded m-tuples to I and Q signals and a square-root raised cosine filtering of the I and Q signals prior to QAM modulation. - QAM modulation - and physical interface Similar to the 5.83 System A, this unit performs Q
29、AM modulation. It is followed by interfacing the QAM modulated signal to the radio-frequency MMDS channel. The MMDS System A receiver shall perform the inverse signal processing, as described for the modulation process above, in order to recover the baseband signal. A.2.2 LMDS svstem concept The LMD
30、S system shall be defmed as the functional block of eauiDment performing the adaptation of the baseband TV signals to the LMDS channel characteristics (see Fimire A.2). At the transmitter site. the following TV baseband sima1 source can be considered - satellite simalb); - cable simal(s); - contribu
31、tion linksk - local monatmne sourceb). The mocesses in the followine. subclauses shall be applied for LMDS as shown in Fipure A.2. - baseband interfacing and svnchronizatiox - - outer encoding (Reed-Solomon encodin I Fimire A.2lJ.150 is identical to Figure 8/IT-R B0.1211. Annex 1. Auuendix 2. For th
32、e purpose of the uresent Recommendation, the cautions “To RF satellite channel“ and “From RF satellite channel“ in that fipure should be understood to respectively mean “To LMDS transmitter“ and “From LMDS antenna and low-noise down-converter“. 2 Recommendation J.lSO/Amd.l (09/99) I - convolutional
33、interleaving; I - I - I - I Ali these functions are identical to those defined in Recommendation ITU-R B0.1211 Annex 1, ApDendix 2. inner encoding (ex. punctured convolutional code); baseband shaping for modulation; OPSK modulation and Dhvsicai interface. A.3 WEG-2 transport layer The MPEG-2 transpo
34、rt layer shall be identical to the one defined in 5.83 System A. A.4 Framing structure The framing structure shall be identical to the one defined in 5.83 System A. AS Channel coding The channel coding shall be identicai to the one defined in 5.83 System A. A.6 Byte-to-symbol mapping The byte-to-sym
35、bol mapping shall be identical to the one defined in 5.83 System A. A.7 Modulation 5.83 System A defined modulations for cable networks. They are also valid for the MMDS channels. The modulations of System A shall be identical to the ones defined in J.83 System A. - A.8 Baseband filtering characteri
36、stics The baseband filtering characteristics shall be identical to the ones defined in J.83 System A. Recommendation J.lSO/Amd.l (09/99) 3 I cok I 4 Recommendation J. 1 SO/Amd. 1 (09/99) f mu.! t t t 4 4 t % Y .I v1 M e * .I .I o t e a M s .- U Y 2 E Y o 9 Y I = 11b2591 ObbAb2b 7b A A J Eo- Eo O0 B
37、N u) - r D! r m $u (2: U I Recommendation J.150lAmd.l (09/99) B 9 rr O E L, d .I U I O I? 5 Li8b259L Obb8b27 702 Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series
38、U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human
39、factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction,
40、installation and protection of cables and other elements of outside plant “ and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of mea
41、suring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure Languages and general software aspects for telecommunication systems Printed in Switzerland Geneva, 2000
