Committee T1 - Telecommunications Technical Report No. 59 September 1999 Single-Carrier Rate Adaptive Digital Subscriber Line (RADSL) Prepared by T1E1.4 Working Group on Digital Subscriber Line (DSL) Access Problem Solvers to the Telecommunications Industry Copyright © 1999 by Alliance for Telecommunications Industry Solutions All rights reserved. Committee T1 is sponsored by the Alliance for Telecommunications Industry Solutions (ATIS) and accredited by the American National Standards Institute (ANSI) No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Technical Report No. 59 Single-Carrier Rate Adaptive Digital Subscriber Line (RADSL) Document T1E1.4/99-161R3 Prepared by T1E1.4 Working Group on Digital Subscriber Line (DSL) Access This page intentionally left blank. Table of Contents 1. Scope and Purpose........................................................................................................................................ 1 1.1 SCOPE ..................................................................................................................................................... 1 1.2 PURPOSE ................................................................................................................................................. 1 2. References..................................................................................................................................................... 1 3. Definitions, Abbreviations, Symbols and Acronyms.................................................................................... 3 3.1 DEFINITIONS............................................................................................................................................ 3 3.2 ABBREVIATIONS, SYMBOLS AND ACRONYMS............................................................................................. 4 4. Reference Models.......................................................................................................................................... 8 4.1 SYSTEM REFERENCE MODEL.................................................................................................................... 8 4.2 GENERAL RADSL TRANSCEIVER SYSTEM MODEL.................................................................................... 8 4.3 SERVICE CLASS DEFINITION..................................................................................................................... 9 5. Single-Carrier RADSL Physical Layer Descriptions................................................................................... 9 5.1 SYSTEM MODEL ...................................................................................................................................... 9 5.1.1 Single-Carrier RADSL System Block Diagram and Input/Output Stream Format............................ 10 5.1.2 Functional Transmitter Reference Model ....................................................................................... 10 5.1.2.1 Common................................................................................................................................................... 10 5.1.2.2 Profile Map of Transmitter Functionality ................................................................................................... 12 5.1.2.3 Profiles ..................................................................................................................................................... 12 5.2 PHYSICAL MEDIUM DEPENDENT (PMD) SUBLAYER................................................................................ 14 5.2.1 PMD Scrambling........................................................................................................................... 14 5.2.1.1 Frame Locked ........................................................................................................................................... 14 5.2.1.2 Bypass PMD Scrambling........................................................................................................................... 17 5.2.2 Coding .......................................................................................................................................... 17 5.2.2.1 Constellation Encoder ............................................................................................................................... 17 5.2.2.1.1 2 D8S Trellis Code ............................................................................................................................. 17 5.2.2.1.2 Differential/Gray................................................................................................................................. 21 5.2.2.2 Tomlinson Precoder .................................................................................................................................. 24 5.2.3 Modulation.................................................................................................................................... 24 5.2.3.1 Block Diagrams ........................................................................................................................................ 24 5.2.3.2 Symbol Rates............................................................................................................................................ 25 5.2.3.2.1 Mandatory Symbol Rates .................................................................................................................... 25 5.2.3.2.2 Optional CAP Symbol Rates ............................................................................................................... 25 5.2.3.2.3 Optional QAM Symbol Rates.............................................................................................................. 26 5.2.3.3 Transmitter Spectrum................................................................................................................................ 26 5.2.3.3.1 Mandatory Center Frequencies ............................................................................................................ 26 5.2.3.3.2 Optional QAM Center Frequencies...................................................................................................... 27 5.2.3.4 PSD Mask & Transmit Signal Power ......................................................................................................... 27 5.2.4 Analog Processor .......................................................................................................................... 31 5.3 TRANSMISSION CONVERGENCE (TC) SUBLAYER..................................................................................... 31 5.3.1 Physical Transmission Convergence.............................................................................................. 31 5.3.1.1 PTC Scrambling........................................................................................................................................ 31 5.3.1.1.1 Self Synchronizing.............................................................................................................................. 31 5.3.1.1.2 Bypass PTC Scrambling...................................................................................................................... 33 5.3.1.2 Reed Solomon........................................................................................................................................... 33 5.3.1.2.1 T=2 Symbol (Byte) Code .................................................................................................................... 33 5.3.1.2.2 T=8 Symbol (Byte) Code .................................................................................................................... 33 5.3.1.3 Interleaving............................................................................................................................................... 33 5.3.1.3.1 Implied Convolutional ........................................................................................................................ 33 5.3.1.3.2 Convolutional - Ramsey Type 2 .......................................................................................................... 35 5.3.1.4 Framing .................................................................................................................................................... 36 5.3.1.4.1 Bit Synchronous Framing.................................................................................................................... 36 5.3.1.4.1.1 Features ...................................................................................................................................... 36 5.3.1.4.1.2 Physical Layer Frame Format ...................................................................................................... 36 5.3.1.4.1.3 Frame Fields ............................................................................................................................... 37 - i - 5.3.1.4.1.4 Bit Order..................................................................................................................................... 38 5.3.1.4.2 Codeword Based................................................................................................................................. 39 5.3.1.4.2.1 Framer Functional Block Diagrams.............................................................................................. 39 5.3.1.4.2.2