1、 ETSI ES 202 488-2 V1.1.1 (2003-09)ETSI Standard Access and Terminals (AT);Second Generation Transmission Systems for InteractiveCable Television Services - IP Cable Modems;Part 2: Radio frequency interface specificationETSI ETSI ES 202 488-2 V1.1.1 (2003-09) 2 Reference DES/AT-020043-02 Keywords ac
2、cess, broadband, cable, data, IP, IPcable, modem ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notic
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6、nd the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2003. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being r
7、egistered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI ES 202 488-2 V1.1.1 (2003-09) 3 Contents Intellectual Property Rights19 Foreword.19 Introduction 19 1 Scope and purpose20 1.1
8、Scope20 1.2 Requirements20 1.3 Background 21 1.3.1 Service goals.21 1.3.2 Reference architecture 22 1.3.3 Categories of interface specification.22 1.3.4 Statement of compatibility22 1.4 Conventions for the present document .23 2 References 23 3 Definitions and abbreviations.25 3.1 Definitions25 3.2
9、Abbreviations .33 4 Functional assumptions 35 4.1 Broadband access network .35 4.2 Equipment assumptions36 4.2.1 Frequency plan36 4.2.2 Compatibility with other services .36 4.2.3 Fault isolation impact on other users 36 4.2.4 Cable system terminal devices36 4.3 RF channel assumptions.36 4.3.1 Trans
10、mission downstream 37 4.3.2 Transmission upstream .37 4.3.2.1 Availability38 4.4 Transmission levels 38 4.5 Frequency inversion .38 5 Communication protocols 38 5.1 Protocol stack .39 5.1.1 CM and CMTS as hosts 39 5.1.2 Data Forwarding Through the CM and CMTS.40 5.1.2.1 General40 5.1.2.2 CMTS Forwar
11、ding Rules 41 5.1.2.3 CM forwarding rules.41 5.1.2.3.1 CPE MAC address acquisition 41 5.1.2.3.2 Forwarding 41 5.2 The MAC forwarder.42 5.2.1 Rules for data-link-layer forwarding.43 5.3 Network layer.43 5.3.1 Requirements for IGMP management 44 5.3.1.1 IGMP timer requirements .44 5.3.1.2 CMTS rules.4
12、4 5.3.1.3 CM rules44 5.3.1.3.1 Multicast forwarding requirements45 5.4 Above the network layer 46 5.5 Data link layer 46 5.5.1 LLC sublayer 46 5.5.2 Link-layer security sublayer .46 5.5.3 MAC sublayer.46 5.5.3.1 MAC service definition.47 5.6 Physical layer .47 ETSI ETSI ES 202 488-2 V1.1.1 (2003-09)
13、 4 5.6.1 Downstream transmission convergence sublayer .47 5.6.2 PMD sublayer .47 5.6.2.1 Interface points47 6 Physical Media Dependent (PMD) sublayer specification.47 6.1 Scope47 6.2 Upstream 48 6.2.1 Overview 48 6.2.2 Signal processing requirements 49 6.2.3 Modulation formats.51 6.2.4 R-S encode52
14、6.2.4.1 R-S encode modes.52 6.2.4.2 R-S bit-to-symbol ordering .52 6.2.5 R-S frame structure.52 6.2.5.1 R-S codeword length.53 6.2.5.1.1 Fixed codeword length 53 6.5.2.1.2 Shortened last codeword53 6.2.6 TDMA byte interleaver.54 6.2.6.1 Byte interleaver parameters.54 6.2.6.2 Interleaver operating mo
15、des54 6.2.6.2.1 Fixed mode 54 6.2.6.2.2 Dynamic mode.55 6.2.7 Scrambler (randomizer) 56 6.2.8 TCM encoder57 6.2.8.1 TCM R-S bytes to symbol mapping58 6.2.9 Preamble prepend .60 6.2.10 Modulation rates .60 6.2.11 S-CDMA framer and interleaver 60 6.2.11.1 S-CDMA framing considerations60 6.2.11.2 Mini-
16、slot numbering61 6.2.11.2.1 Mini-slot numbering parameters in UCD 62 6.2.11.2.2 Mini-slot numbering examples63 6.2.11.3 Transmission time .64 6.2.11.4 Latency considerations64 6.2.11.5 Spreader-off bursts for maintenance on S-CDMA channel.64 6.2.12 S-CDMA framer .66 6.2.12.1 Subframe definition.66 6
17、.2.12.2 Framer operation.67 6.2.12.2.1 Rules for preamble and coded TCM symbols .67 6.2.12.2.2 Rules for uncoded symbols and the uncoded TCM subsymbols .67 6.2.12.2.3 Subframe example .68 6.2.12.2.4 Frame transmission68 6.2.13 Symbol mapping.68 6.2.14 S-CDMA spreader 76 6.2.14.1 Code Hopping .77 6.2
18、.15 Transmit pre-equalizer78 6.2.16 Spectral shaping79 6.2.16.1 Upstream frequency agility and range.80 6.2.16.2 Spectrum format80 6.2.17 Relative processing delays80 6.2.18 Transmit power requirements .80 6.2.18.1 TDMA transmit power calculations81 6.2.18.2 S-CDMA transmit power calculations 82 6.2
19、.18.3 Transmit power step size.83 6.2.19 Burst profiles 83 6.2.19.1 Ranging offset .84 6.2.19.2 TDMA reconfiguration times85 6.2.19.3 S-CDMA reconfiguration times86 6.2.20 Burst timing convention86 6.2.21 Fidelity requirements 87 6.2.21.1 Spurious emissions87 6.2.21.1.1 Adjacent channel spurious emi
20、ssions 88 ETSI ETSI ES 202 488-2 V1.1.1 (2003-09) 5 6.2.21.1.2 Spurious emissions in 5 MHz to 42 MHz89 6.2.21.2 Spurious emissions during burst on/off transients.89 6.2.21.3 Modulation Error Ratio (MER).89 6.2.21.3.1 Definitions .90 6.2.21.3.2 Requirements.91 6.2.21.4 Filter distortion92 6.2.21.4.1
21、Amplitude92 6.2.21.4.2 Phase92 6.2.21.5 Carrier phase noise92 6.2.21.6 Channel frequency accuracy .92 6.2.21.7 Modulation rate accuracy92 6.2.21.8 Modulation timing jitter 93 6.2.21.8.1 Symbol timing titter for asynchronous operation 93 6.2.21.8.2 Chip timing jitter for synchronous operation.93 6.2.
22、22 Upstream demodulator input power characteristics93 6.2.23 Upstream electrical output from the CM 94 6.3 Downstream .94 6.3.1 Downstream protocol94 6.3.2 Scalable interleaving to support low latency 94 6.3.3 Downstream frequency plan .95 6.3.4 CMTS output electrical.95 6.3.5 Downstream electrical
23、input to CM95 6.3.6 CM BER performance 96 6.3.6.1 64 QAM 96 6.3.6.1.1 64 QAM CM BER performance96 6.3.6.1.2 64 QAM image rejection performance 96 6.3.6.1.3 64 QAM adjacent channel performance 96 6.3.6.2 256 QAM 96 6.3.6.2.1 256 QAM CM BER performance96 6.3.6.2.2 256 QAM image rejection performance 9
24、6 6.3.6.2.3 256 QAM adjacent channel performance 97 6.3.7 CMTS timestamp jitter .97 6.3.7.1 CMTS master clock jitter for asynchronous operation97 6.3.7.2 CMTS master clock jitter for synchronous operation .98 6.3.7.3 CMTS master clock frequency drift for synchronous operation .98 6.3.8 CMTS clock ge
25、neration98 6.3.9 CMTS downstream symbol clock jitter for synchronous operation99 6.3.10 CMTS downstream symbol clock drift for synchronous operation 99 7 Downstream transmission convergence sublayer.99 7.1 Introduction 99 7.2 MPEG packet format100 7.3 MPEG header for Data-Over-Cable DOCS100 7.4 MPEG
26、 payload for Data-Over-Cable DOCS101 7.4.1 stuff_byte 101 7.4.2 pointer_field101 7.5 Interaction with the MAC sublayer 101 7.6 Interaction with the Physical layer .102 7.7 MPEG header synchronization and recovery .102 8 Media Access Control (MAC) specification 103 8.1 Introduction 103 8.1.1 Overview
27、 103 8.1.2 Definitions 103 8.1.2.1 MAC-sublayer domain103 8.1.2.2 MAC Service Access Point (MSAP) 103 8.1.2.3 Service flows.103 8.1.2.4 Upstream intervals, mini-slots and 6,25-ms increments104 8.1.2.4.1 TDMA mode .104 8.1.2.4.2 S-CDMA mode104 8.1.2.5 MAC frame .105 8.1.2.6 Logical upstream channels1
28、05 ETSI ETSI ES 202 488-2 V1.1.1 (2003-09) 6 8.1.3 Future use .105 8.2 MAC frame formats .106 8.2.1 Generic MAC frame format106 8.2.1.1 PMD overhead 106 8.2.1.2 MAC frame transport 107 8.2.1.3 Ordering of bits and octets 107 8.2.1.3.1 Representing negative numbers.107 8.2.1.3.2 Type-length-value fie
29、lds107 8.2.1.4 MAC header format 108 8.2.1.5 Data PDU 109 8.2.2 Packet-based MAC frames .109 8.2.2.1 Variable-length packets.109 8.2.3 ATM cell MAC frames.110 8.2.4 Reserved PDU MAC frames.110 8.2.5 MAC-specific headers 111 8.2.5.1 Timing header .111 8.2.5.2 MAC management header.112 8.2.5.3 Request
30、 frame .112 8.2.5.4 Fragmentation header113 8.2.5.5 Concatenation Header .114 8.2.6 Extended MAC headers 115 8.2.6.1 Piggyback requests116 8.2.6.2 Fragmentation extended header 116 8.2.6.3 Service flow extended header .117 8.2.6.3.1 Payload header suppression header .117 8.2.6.3.2 Unsolicited grant
31、synchronization header118 8.2.7 Fragmented MAC frames .119 8.2.7.1 Considerations for concatenated packets and fragmentation 120 8.2.8 Error-handling.120 8.2.8.1 Error recovery during fragmentation.121 8.2.8.2 Error codes and messages .121 8.3 MAC management messages .121 8.3.1 MAC management messag
32、e header121 8.3.2 Time Synchronization (SYNC).123 8.3.3 Upstream Channel Descriptor (UCD).124 8.3.3.1 Example of UCD encoded TLV data 130 8.3.4 Upstream bandwidth allocation Map (MAP)131 8.3.5 Ranging - Request (RNG-REQ) .133 8.3.6 Ranging - Response (RNG-RSP)134 8.3.6.1 Encodings136 8.3.6.2 Example
33、 of TLV data137 8.3.6.3 Overriding channels prior to registration 137 8.3.7 Registration - Request (REG-REQ)137 8.3.8 Registration - Response (REG-RSP) 139 8.3.8.1 Encodings141 8.3.8.1.1 Modem capabilities .141 8.3.8.1.2 DOCS 1.0 service class data141 8.3.9 Registration - Acknowledge (REG-ACK) 141 8
34、.3.10 Upstream Channel Change - Request (UCC-REQ) 143 8.3.11 Upstream Channel Change - Response (UCC-RSP).143 8.3.12 Dynamic Service Addition - Request (DSA-REQ).144 8.3.12.1 CM-initiated dynamic service edition .144 8.3.12.2 CMTS-initiated dynamic service addition 145 8.3.13 Dynamic Service Additio
35、n - Response (DSA-RSP) .145 8.3.13.1 CM-initiated dynamic service addition .146 8.3.13.2 CMTS-initiated dynamic service addition 146 8.3.14 Dynamic Service Addition - Acknowledge (DSA-ACK).147 8.3.15 Dynamic Service Change - Request (DSC-REQ).148 8.3.16 Dynamic Service Change - Response (DSC-RSP) .1
36、49 8.3.17 Dynamic Service Change - Acknowledge (DSC-ACK) .150 8.3.18 Dynamic Service Deletion - Request (DSD-REQ) .151 8.3.19 Dynamic Service Deletion - Response (DSD-RSP)152 ETSI ETSI ES 202 488-2 V1.1.1 (2003-09) 7 8.3.20 Dynamic Channel Change - Request (DCC-REQ) .152 8.3.20.1 Encodings153 8.3.20
37、.1.1 Upstream channel ID.153 8.3.20.1.2 Downstream parameters 153 8.3.20.1.3 Initialization technique 155 8.3.20.1.4 UCD substitution.156 8.3.20.1.5 Security Association Identifier (SAID) substitution157 8.3.20.1.6 Service flow substitutions157 8.3.20.1.7 CMTS MAC address .158 8.3.21 Dynamic Channel
38、 Change - Response (DCC-RSP)158 8.3.21.1 Encodings 159 8.3.22 Dynamic Channel Change - Acknowledge (DCC-ACK) .160 8.2.23 Device Class Identification - Request (DCI-REQ) .161 8.3.24 Device Class Identification - Response (DCI-RSP)161 8.3.25 Upstream transmitter - Disable (UP-DIS) MAC management messa
39、ge.162 8.3.26 Initial - Ranging - Request (INIT-RNG-REQ) .163 9 Media Access Control (MAC) protocol operation .164 9.1 Upstream bandwidth allocation164 9.1.1 The allocation MAP MAC management message 165 9.1.2 Information Elements (IEs).165 9.1.2.1 The request IE .165 9.1.2.2 The Request/Data IE .16
40、6 9.1.2.3 The initial maintenance IE 166 9.1.2.4 The station maintenance IE.166 9.1.2.5 Short and Long data grant IEs.166 9.1.2.6 Data acknowledge IE 167 9.1.2.7 Expansion IE.167 9.1.2.8 Null IE.167 9.1.2.9 Advanced PHY short and long data grant IEs.167 9.1.2.10 Advanced PHY unsolicited grant IE .16
41、7 9.1.3 Requests167 9.1.4 Information element feature usage summary168 9.1.5 MAP transmission and timing 169 9.1.6 Protocol example 169 9.1.7 MAP generation example - two logical upstreams .170 9.2 Support for multiple channels 171 9.3 Timing and synchronization.172 9.3.1 Global timing reference 172
42、 9.3.2 CM channel acquisition 172 9.3.3 Ranging.173 9.3.3.1 Broadcast Initial Ranging173 9.3.3.2 Unicast initial ranging.173 9.3.4 Timing units and relationships173 9.3.4.1 TDMA timing units and relationships.174 9.3.4.1.1 Mini-slot capacity174 9.3.4.1.2 Mini-slot numbering174 9.3.4.2 S-CDMA timing
43、units and relationships .174 9.3.4.2.1 Mini-slot capacity174 9.3.4.2.2 Mini-slot numbering175 9.4 Upstream transmission and contention resolution175 9.4.1 Contention resolution overview175 9.4.2 Transmit opportunities176 9.4.3 CM bandwidth utilization .176 9.5 Data link encryption support 176 9.5.1
44、MAC messages .177 9.5.2 Framing.177 10 Quality of Service and fragmentation 177 10.1 Theory of operation177 10.1.1 Concepts .178 10.1.1.1 Service flows.178 ETSI ETSI ES 202 488-2 V1.1.1 (2003-09) 8 10.1.1.2 Classifiers180 10.1.2 Object model.181 10.1.3 Service classes 182 10.1.4 Authorization 184 10
45、.1.5 Types of service flows 184 10.1.5.1 Provisioned service flows .184 10.1.5.2 Admitted service flows .185 10.1.5.3 Active service flows185 10.1.6 Service flows and classifiers.186 10.1.6.1 Policy-based classification and service classes .186 10.1.7 General operation187 10.1.7.1 Static operation .
46、187 10.1.7.2 Dynamic service flow creation - CM initiated 189 10.1.7.3 Dynamic service flow creation - CMTS initiated189 10.1.7.4 Dynamic service flow modification and deletion190 10.2 Upstream service flow scheduling services190 10.2.1 Unsolicited grant service 191 10.2.2 Real-time Polling Service
47、(rtPS).191 10.2.3 Unsolicited Grant Service with Activity Detection (UGS-AD)191 10.2.4 Non-real-time Polling Service (nrtPS)192 10.2.5 Best Effort (BE) service192 10.2.6 Other services .193 10.2.6.1 Committed Information Rate (CIR) 193 10.2.7 Parameter applicability for upstream service scheduling19
48、3 10.2.8 CM transmit behaviour .193 10.3 Fragmentation.194 10.3.1 CM fragmentation support194 10.3.1.1 Fragmentation rules.194 10.3.2 CMTS fragmentation support .195 10.3.2.1 Multiple grant mode196 10.3.2.2 Piggyback mode196 10.3.3 Fragmentation example.196 10.3.3.1 Single packet fragmentation196 10
49、.3.3.2 Concatenated packet fragmentation 198 10.4 Payload Header Suppression (PHS) .199 10.4.1 Overview 200 10.4.2 Example applications201 10.4.3 Operation 201 10.4.4 Signalling203 10.4.5 Payload Header Suppression examples.204 10.4.5.1 Upstream example.204 10.4.5.2 Downstream example205 11 Cable modem - CMTS interaction .205 11.1 CMTS initialisation 205 11.2 Cable Modem initialisation 206 11.2.1 Scanning and synchronization to downstream208 11.2.2 Obtain upstream parameters .209 11.2.3 Message flows during scanning and upstream parameter acquisition 210 11.2.4 Ranging and automa
