This version is superseded by the ANSI/SCTE 22-1 standard available here: http://www.scte.org/standards/Standards_Available.aspx Data-Over-Cable Service Interface Specifications DOCSIS 1.0 Radio Frequency Interface Specification SP-RFI-C01-011119 Notice This document is a cooperative effort undertaken at the direction of Cable Television Laboratories, Inc. (CableLabs®) for the benefit of the cable industry in general. Neither CableLabs, nor any other entity participating in the creation of this document, is responsible for any liability of any nature whatsoever resulting from or arising out of use or reliance upon this document by any party. This document is furnished on an AS-IS basis and neither CableLabs, nor other participating entity, provides any representation or warranty, express or implied, regarding its accuracy, completeness, or fitness for a particular purpose. Copyright 1997-2001 Cable Television Laboratories, Inc. All rights reserved. SP-RFI-C01-011119 Data-Over-Cable Service Interface Specifications 1.0 Document Status Sheet Document Control Number: SP-RFI-C01-011119 Document Title: Radio Frequency Interface Specification Revision History: I01 – First Release, March 26, 1997 I02 – Second Issued Release, October 8, 1997 I03 – Third Issued Release, February 2, 1998 I04 – Fourth Issued Release, July 24, 1998 I05 – Fifth Issued Release, November 5, 1999 I06 – Sixth Issued Release, August 29, 2001 C01 – Closed, November 19, 2001 Date: November 19, 2001 Status: Work in Draft Issued Closed Progress Distribution Restrictions: Author CL/Member CL/ Public Only Member/ Vendor Key to Document Status Codes: Work in An incomplete document designed to guide discussion and generate Progress feedback that may include several alternative requirements for consideration. Draft A document in specification format considered largely complete, but lacking reviews by Members and vendors. Drafts are susceptible to substantial change during the review process. Issued A stable document, which has undergone rigorous member and vendor review and is suitable for product design and development, cross-vendor interoperability, and for certification testing. Closed A static document, reviewed, tested, validated, and closed to further engineering change requests to the specification through CableLabs. ii CableLabs ® Radio Frequency Interface Specification SP-RFI-C01-011119 Table of Contents 1 SCOPE AND PURPOSE .................................................................................................................. 1 1.1 Scope .............................................................................................................................................................. 1 1.2 Requirements................................................................................................................................................. 1 1.3 Background ................................................................................................................................................... 2 1.3.1 Service Goals .......................................................................................................................................... 2 1.3.2 Reference Architecture............................................................................................................................ 2 1.3.3 Server Location....................................................................................................................................... 6 2. FUNCTIONAL ASSUMPTIONS .................................................................................................... 7 2.1 Broadband Access Network ......................................................................................................................... 7 2.2 Equipment Assumptions............................................................................................................................... 7 2.2.1 Frequency Plan........................................................................................................................................ 7 2.2.2 Compatibility with Other Services .......................................................................................................... 7 2.2.3 Fault Isolation Impact on Other Users .................................................................................................... 7 2.3 RF Channel Assumptions ............................................................................................................................. 8 2.3.1 Transmission Downstream...................................................................................................................... 8 2.3.2 Transmission Upstream........................................................................................................................... 9 2.4 Transmission Levels...................................................................................................................................... 9 2.5 Frequency Inversion ..................................................................................................................................... 9 3 COMMUNICATION PROTOCOLS............................................................................................ 10 3.1 Protocol Stack ............................................................................................................................................. 10 3.1.1 CM and CMTS as Hosts ....................................................................................................................... 10 3.1.2 Data Forwarding Through the CM and CMTS ..................................................................................... 11 3.2 The MAC Forwarder.................................................................................................................................. 13 3.2.1 Example Rules for Data-Link-Layer Forwarding.................................................................................. 14 3.3 Network Layer ............................................................................................................................................ 15 3.4 Above the Network Layer .......................................................................................................................... 15 3.5 Data Link Layer.......................................................................................................................................... 15 3.5.1 LLC Sublayer........................................................................................................................................ 15 3.5.2 Link-Layer Security Sublayer ............................................................................................................... 15 3.5.3 MAC Sublayer ...................................................................................................................................... 15 3.6 Physical Layer ............................................................................................................................................. 16 3.6.1 Downstream Transmission Convergence Sublayer ............................................................................... 16 3.6.2 PMD Sublayer....................................................................................................................................... 16 4. PHYSICAL MEDIA DEPENDENT SUBLAYER SPECIFICATION ...................................... 18 4.1 Scope ............................................................................................................................................................ 18 4.2 Upstream...................................................................................................................................................... 18 4.2.1 Overview............................................................................................................................................... 18 4.2.2 Modulation Formats.............................................................................................................................. 19 4.2.3 FEC Encode .......................................................................................................................................... 21 4.2.4 Scrambler (Randomizer) ....................................................................................................................... 22 4.2.5 Preamble Prepend ................................................................................................................................. 22 4.2.6 Burst Profiles ........................................................................................................................................ 23 4.2.7 Burst Timing Convention...................................................................................................................... 25 4.2.8 Transmit Power Requirements .............................................................................................................. 26 4.2.9 Fidelity Requirements ........................................................................................................................... 27 4.2.10 Frame Structure..................................................................................................................................... 30 4.2.11 Signal Processing Requirements ........................................................................................................... 31 4.2.12 Upstream