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DOCSIS2.0射频接口规范
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DOCSIS2.0,射频接口规范, CableLabs定义的通过双向有线电视传输数据业务的规范
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Data-Over-Cable Service Interface Specifications
DOCSIS 2.0
Radio Frequency Interface Specification
CM-SP-RFIv2.0-C02-090422
CLOSED
SPECIFICATION
Notice
This DOCSIS specification is the result of a cooperative effort
undertaken at the direction of Cable Television Laboratories, Inc. for the
benefit of the cable industry and its customers. This document may
contain references to other documents not owned or controlled by
CableLabs. Use and understanding of this document may require
access to such other documents. Designing, manufacturing, distributing,
using, selling, or servicing products, or providing services, based on this
document may require intellectual property licenses from third parties for
technology referenced in this document.
Neither CableLabs nor any member company is responsible to any party
for any liability of any nature whatsoever resulting from or arising out of
use or reliance upon this document, or any document referenced herein.
This document is furnished on an "AS IS" basis and neither CableLabs
nor its members provides any representation or warranty, express or
implied, regarding the accuracy, completeness, noninfringement, or
fitness for a particular purpose of this document, or any document
referenced herein.
© Copyright 1999-2009 Cable Television Laboratories, Inc.
All rights reserved.
CM-SP-RFIv2.0-C02-090422 Data-Over-Cable Service Interface Specifications
ii CableLabs
®
04/22/09
Document Status Sheet
Document Control Number
CM-SP-RFIv2.0-C02-090422
Document Title
Radio Frequency Interface Specification
Revision History
I01 - December 31, 2001
I02 - June 17, 2002
I03 - December 18, 2002
I04 - July 30, 2003
I05 - April 7, 2004
I06 - August 4, 2004
I07 - December 10, 2004
I08 - April 8, 2005
I09 - August 12, 2005
I10 - December 9, 2005
I11 - June 2, 2006
I12 - December 6, 2007
I13 - February 15, 2008
C01 - November 4, 2008
C02 - April 22, 2009
Date
April 22, 2009
Status
Work in
Progress
Draft
Issued
Closed
Distribution Restrictions
Author Only
CL/Member CL/ Member/
Vendor
Public
Key to Document Status Codes
Work in Progress
An incomplete document, designed to guide discussion and generate feedback that may
include several alternative requirements for consideration.
Draft
A document in specification format considered largely complete, but lacking review 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.
Trademarks
CableLabs
®
, DOCSIS
®
, EuroDOCSIS™, eDOCSIS™, M-CMTS™, PacketCable™, EuroPacketCable™,
PCMM™, CableHome
®
, CableOffice™, OpenCable™, OCAP™, CableCARD™, M-Card™, DCAS™, tru2way™,
and CablePC™ are trademarks of Cable Television Laboratories, Inc.
Radio Frequency Interface Specification CM-SP-RFIv2.0-C02-090422
04/22/09 CableLabs
®
iii
Table of Contents
1 RADIO FREQUENCY INTERFACE SPECIFICATION ..............................................................................1
1.1 Scope and Purpose.........................................................................................................................................1
1.1.1 Scope......................................................................................................................................................1
1.2 Requirements.................................................................................................................................................2
1.3 Background....................................................................................................................................................2
1.3.1 Service Goals.........................................................................................................................................2
1.3.2 Reference Architecture ..........................................................................................................................3
1.3.3 Categories of Interface Specification ....................................................................................................3
1.3.4 Statement of Compatibility ....................................................................................................................4
1.4 Conventions for this Specification.................................................................................................................4
2 REFERENCES (NORMATIVE/INFORMATIVE).........................................................................................5
3 GLOSSARY (INFORMATIVE) ......................................................................................................................10
4 FUNCTIONAL ASSUMPTIONS ....................................................................................................................25
4.1 Broadband Access Network ........................................................................................................................25
4.2 Equipment Assumptions..............................................................................................................................25
4.2.1 Frequency Plan....................................................................................................................................25
4.2.2 Compatibility with Other Services.......................................................................................................26
4.2.3 Fault Isolation Impact on Other Users................................................................................................26
4.2.4 Cable System Terminal Devices ..........................................................................................................26
4.3 RF Channel Assumptions............................................................................................................................26
4.3.1 Transmission Downstream ..................................................................................................................26
4.3.2 Transmission Upstream.......................................................................................................................27
4.4 Transmission Levels....................................................................................................................................28
4.5 Frequency Inversion ....................................................................................................................................28
5 COMMUNICATION PROTOCOLS ..............................................................................................................29
5.1 Protocol Stack..............................................................................................................................................29
5.1.1 CM and CMTS as Hosts ......................................................................................................................29
5.1.2 Data Forwarding Through the CM and CMTS ...................................................................................30
5.2 The MAC Forwarder ...................................................................................................................................33
5.2.1 Rules for Data-Link-Layer Forwarding ..............................................................................................34
5.3 Network Layer.............................................................................................................................................34
5.3.1 Requirements for IGMP Management.................................................................................................35
5.4 Above the Network Layer ...........................................................................................................................37
5.5 Data Link Layer...........................................................................................................................................37
5.5.1 LLC Sublayer.......................................................................................................................................38
5.5.2 Link-Layer Security Sublayer ..............................................................................................................38
5.5.3 MAC Sublayer......................................................................................................................................38
5.6 Physical Layer .............................................................................................................................................38
5.6.1 Downstream Transmission Convergence Sublayer.............................................................................38
5.6.2 PMD Sublayer .....................................................................................................................................39
6 PHYSICAL MEDIA DEPENDENT SUBLAYER SPECIFICATION.........................................................40
6.1 Scope ...........................................................................................................................................................40
6.2 Upstream......................................................................................................................................................40
6.2.1 Overview..............................................................................................................................................40
6.2.2 Signal Processing Requirements .........................................................................................................41
6.2.3 Modulation Formats............................................................................................................................43
CM-SP-RFIv2.0-C02-090422 Data-Over-Cable Service Interface Specifications
iv CableLabs
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04/22/09
6.2.4 R-S Encode ..........................................................................................................................................44
6.2.5 R-S Frame Structure............................................................................................................................44
6.2.6 TDMA Byte Interleaver........................................................................................................................46
6.2.7 Scrambler (Randomizer)......................................................................................................................49
6.2.8 TCM Encoder ......................................................................................................................................50
6.2.9 Preamble Prepend ...............................................................................................................................53
6.2.10 Modulation Rates.................................................................................................................................53
6.2.11 S-CDMA Framer and Interleaver........................................................................................................54
6.2.12 S-CDMA Framer .................................................................................................................................60
6.2.13 Symbol Mapping..................................................................................................................................63
6.2.14 S-CDMA Spreader...............................................................................................................................71
6.2.15 Transmit Pre-Equalizer .......................................................................................................................73
6.2.16 Spectral Shaping..................................................................................................................................75
6.2.17 Relative Processing Delays .................................................................................................................75
6.2.18 Transmit Power Requirements ............................................................................................................76
6.2.19 Burst Profiles.......................................................................................................................................81
6.2.20 Burst Timing Convention.....................................................................................................................86
6.2.21 Fidelity Requirements..........................................................................................................................87
6.2.22 Upstream Demodulator Input Power Characteristics.........................................................................94
6.2.23 Upstream Electrical Output from the CM ...........................................................................................95
6.3 Downstream.................................................................................................................................................95
6.3.1 Downstream Protocol..........................................................................................................................95
6.3.2 Scalable Interleaving to Support Low Latency....................................................................................95
6.3.3 Downstream Frequency Plan ..............................................................................................................96
6.3.4 CMTS Output Electrical ......................................................................................................................96
6.3.5 Downstream Electrical Input to CM....................................................................................................97
6.3.6 CM BER Performance.........................................................................................................................97
6.3.7 CMTS Timestamp Jitter.......................................................................................................................98
6.3.8 CMTS Clock Generation......................................................................................................................99
6.3.9 CMTS Downstream Symbol Clock Jitter for Synchronous Operation...............................................100
6.3.10 CMTS Downstream Symbol Clock Drift for Synchronous Operation ...............................................101
7 DOWNSTREAM TRANSMISSION CONVERGENCE SUBLAYER ......................................................102
7.1 Introduction ...............................................................................................................................................102
7.2 MPEG Packet Format................................................................................................................................102
7.3 MPEG Header for DOCSIS Data-Over-Cable ..........................................................................................103
7.4 MPEG Payload for DOCSIS Data-Over-Cable.........................................................................................103
7.4.1 stuff_byte............................................................................................................................................103
7.4.2 pointer_field.......................................................................................................................................103
7.5 Interaction with the MAC Sublayer...........................................................................................................104
7.6 Interaction with the Physical Layer ...........................................................................................................105
7.7 MPEG Header Synchronization and Recovery .........................................................................................105
8 MEDIA ACCESS CONTROL SPECIFICATION.......................................................................................106
8.1 Introduction ...............................................................................................................................................106
8.1.1 Overview............................................................................................................................................106
8.1.2 Definitions .........................................................................................................................................106
8.1.3 Future Use.........................................................................................................................................109
8.2 MAC Frame Formats.................................................................................................................................109
8.2.1 Generic MAC Frame Format ............................................................................................................109
8.2.2 Packet-Based MAC Frames...............................................................................................................113
8.2.3 ATM Cell MAC Frames.....................................................................................................................114
8.2.4 Reserved PDU MAC Frames.............................................................................................................114
8.2.5 MAC-Specific Headers ......................................................................................................................114
8.2.6 Extended MAC Headers ....................................................................................................................119
Radio Frequency Interface Specification CM-SP-RFIv2.0-C02-090422
04/22/09 CableLabs
®
v
8.2.7 Fragmented MAC Frames.................................................................................................................124
8.2.8 Error-Handling..................................................................................................................................125
8.3 MAC Management Messages....................................................................................................................127
8.3.1 MAC Management Message Header.................................................................................................127
8.3.2 Time Synchronization (SYNC)...........................................................................................................129
8.3.3 Upstream Channel Descriptor (UCD)...............................................................................................130
8.3.4 Upstream Bandwidth Allocation Map (MAP)....................................................................................137
8.3.5 Ranging Request (RNG-REQ) ...........................................................................................................139
8.3.6 Ranging Response (RNG-RSP)..........................................................................................................141
8.3.7 Registration Request (REG-REQ) .....................................................................................................146
8.3.8 Registration Response (REG-RSP)....................................................................................................147
8.3.9 Registration Acknowledge (REG-ACK).............................................................................................151
8.3.10 Upstream Channel Change Request (UCC-REQ).............................................................................152
8.3.11 Upstream Channel Change Response (UCC-RSP)............................................................................152
8.3.12 Dynamic Service Addition — Request (DSA-REQ)...........................................................................153
8.3.13 Dynamic Service Addition — Response (DSA-RSP)..........................................................................155
8.3.14 Dynamic Service Addition — Acknowledge (DSA-ACK)...................................................................157
8.3.15 Dynamic Service Change — Request (DSC-REQ) ............................................................................158
8.3.16 Dynamic Service Change — Response (DSC-RSP)...........................................................................159
8.3.17 Dynamic Service Change — Acknowledge (DSC-ACK)....................................................................161
8.3.18 Dynamic Service Deletion — Request (DSD-REQ)...........................................................................162
8.3.19 Dynamic Service Deletion – Response (DSD-RSP)...........................................................................163
8.3.20 Dynamic Channel Change – Request (DCC-REQ) ...........................................................................163
8.3.21 Dynamic Channel Change – Response (DCC-RSP)..........................................................................170
8.3.22 Dynamic Channel Change – Acknowledge (DCC-ACK)...................................................................172
8.3.23 Device Class Identification Request (DCI-REQ)...............................................................................172
8.3.24 Device Class Identification Response (DCI-RSP).............................................................................173
8.3.25 Upstream Transmitter Disable (UP-DIS) MAC Management Message............................................175
8.3.26 Initial Ranging Request (INIT-RNG-REQ)........................................................................................176
8.3.27 Test Request (TST-REQ)....................................................................................................................178
9 MEDIA ACCESS CONTROL PROTOCOL OPERATION.......................................................................180
9.1 Upstream Bandwidth Allocation ...............................................................................................................180
9.1.1 The Allocation MAP MAC Management Message ............................................................................181
9.1.2 Information Elements.........................................................................................................................181
9.1.3 Requests.............................................................................................................................................183
9.1.4 Information Element Feature Usage Summary .................................................................................185
9.1.5 Map Transmission and Timing..........................................................................................................185
9.1.6 Protocol Example ..............................................................................................................................186
9.1.7 MAP Generation Example - Two Logical Upstreams .......................................................................187
9.2 Support for Multiple Channels ..................................................................................................................187
9.3 Timing and Synchronization......................................................................................................................188
9.3.1 Global Timing Reference...................................................................................................................188
9.3.2 CM Channel Acquisition....................................................................................................................189
9.3.3 Ranging..............................................................................................................................................189
9.3.4 Timing Units and Relationships.........................................................................................................190
9.4 Upstream Transmission and Contention Resolution..................................................................................192
9.4.1 Contention Resolution Overview .......................................................................................................192
9.4.2 Transmit Opportunities......................................................................................................................193
9.4.3 CM Bandwidth Utilization.................................................................................................................194
9.5 Data Link Encryption Support...................................................................................................................194
9.5.1 MAC Messages ..................................................................................................................................194
9.5.2 Framing .............................................................................................................................................194
10 QUALITY OF SERVICE AND FRAGMENTATION ............................................................................195
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- ranwengdnd2014-12-10我在网上找了很久,终于找到了,可惜全是英文,要是有中文版该多好啊!
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