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ETR 192 TECHNICAL July 1995 REPORT ETSI ETR 192 TECHNICAL July 1995 REPORT Source: ETSI TC-SES Reference: DTR/SES-04014 ICS: 33.060, 33.060.20 Key words: broadcasting, contribution, earth station, radio, satellite, TV Satellite Earth Stations and Systems (SES); Modulation and channel coding of 34,368 Mbit/s and 44,736 Mbit/s digital television contribution links via satellite ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [email protected] Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16 Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. New presentation - see History box © European Telecommunications Standards Institute 1995. All rights reserved. Page 2 ETR 192: July 1995 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to "ETSI Editing and Committee Support Dept." at the address shown on the title page. Page 3 ETR 192: July 1995 Contents Foreword .......................................................................................................................................................5 Introduction....................................................................................................................................................5 1 Scope ..................................................................................................................................................7 2 References..........................................................................................................................................7 3 Overview .............................................................................................................................................7 Annex A (informative): Draft ETS for the modulation and channel coding of 34,368 Mbit/s and 44,736 Mbit/s digital television contribution links via satellite ...............................8 1 Scope ..................................................................................................................................................8 2 Normative references..........................................................................................................................8 3 Abbreviations.......................................................................................................................................8 4 General................................................................................................................................................9 5 Channel unit characteristics (requirements)........................................................................................9 5.1 Modulator .............................................................................................................................9 5.1.1 Output characteristics....................................................................................10 5.1.2 Modulator spectrum output............................................................................10 5.2 Demodulator ......................................................................................................................11 5.2.1 Operating conditions .....................................................................................11 5.2.2 Demodulator filter characteristics..................................................................11 5.3 Forward error correction ....................................................................................................11 5.3.1 Coder.............................................................................................................11 5.3.2 Decoder.........................................................................................................12 5.3.3 Reed-Solomon outer coding (optional)..........................................................12 5.4 Energy dispersal (scrambling) ...........................................................................................12 5.5 BER performance characteristics ......................................................................................13 5.6 Overhead framing for ESC and alarms .............................................................................13 5.6.1 Overhead frame structure .............................................................................13 5.6.1.1 Frame and multiframe alignment.........................................14 5.6.2 Maintenance alarm concept for the channel unit ..........................................14 5.6.2.1 Fault conditions and consequent actions ............................14 5.6.2.2 Definition of AIS...................................................................15 5.7 Timing jitter ........................................................................................................................15 5.8 Terrestrial link interfaces....................................................................................................15 5.8.1 Physical/electrical characteristics..................................................................15 5.8.2 Timing interfaces...........................................................................................15 5.9 IF frequency .......................................................................................................................15 5.9.1 IF frequency stability......................................................................................16 5.10 Buffering and slip control ...................................................................................................16 5.10.1 Buffer capacity...............................................................................................16 5.10.2 Slip control.....................................................................................................16 5.11 Local clock .........................................................................................................................16 6 Channel unit characteristics (optional requirements) ........................................................................16 6.1 RS outer code....................................................................................................................16 6.1.1 Polynomials ...................................................................................................16 6.1.1.1 Field generating polynomial.................................................16 6.1.1.2 Code generator polynomials................................................17 Page 4 ETR 192: July 1995 6.1.2 Code parameters.......................................................................................... 17 6.1.3 Shortened codes........................................................................................... 17 6.1.4 Type of RS code ........................................................................................... 18 6.1.5 Interleaving ................................................................................................... 18 6.2 Implementation of the RS outer coder/decoder ................................................................ 18 6.2.1 Switchability of the RS coder/decoder .......................................................... 18 6.3 Synchronization................................................................................................................. 18 6.3.1 UW Definition................................................................................................ 18 6.3.2 Insertion of UW............................................................................................. 19 6.3.3 Syncronization acquisition ............................................................................ 19 6.3.3.1 Initial acquisition and UW detection .................................... 19 6.3.3.2 Steady state and loss of synchronization............................ 19 6.4 Synchronous scrambler .................................................................................................... 19 6.5 Modulator/Demodulator filter response guidelines............................................................ 20 6.5.1 Analogue filters ............................................................................................. 20 6.5.2 Digital filters .................................................................................................. 20 6.6 Power spectral density requirement.................................................................................. 20 6.7 BER performance characteristics for the concatenated RS plus inner FEC coding ......... 20 History......................................................................................................................................................... 35 Page 5 ETR 192: July 1995 Foreword This ETSI Technical Report (ETR) has been prepared by the Satellite Earth Stations and Systems (SES) Technical Committee of the European Telecommunications Standards Institute (ETSI). ETRs are informative documents resulting from ETSI studies which are not appropriate for European Telecommunication Standard (ETS) or Interim European Telecommunication Standard (I-ETS) status. An ETR may be used to publish material
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