DOCSIS 3.1 OFDMA Channel Configuration

This document describes the Remote PHY device DOCSIS 3.1 OFDMA channel configuration on the Cisco cBR Series Converged Broadband Router.

Your software release may not support all the features that are documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. The Feature Information Table at the end of this document provides information about the documented features and lists the releases in which each feature is supported.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.

Hardware Compatibility Matrix for Cisco Remote PHY Device


Note
Unless otherwise specified, the hardware components introduced in a given Cisco Remote PHY Device Software Release are supported in all subsequent releases.
Table 1. Hardware Compatibility Matrix for the Cisco Remote PHY Device

Cisco HFC Platform

Remote PHY Device

Cisco GS7000 Super High Output Node

Cisco 1x2 / Compact Shelf RPD Software 2.1 and Later Releases

Cisco GS7000 Super High Output Intelligent Node (iNode)

Cisco 1x2 / Compact Shelf RPD Software 4.1 and Later Releases

Cisco Intelligent Remote PHY Device 1x2

  • PID—iRPD-1X2=

  • PID—iRPD-1X2-PKEY=

Note
The -PKEY suffix in the PID indicates units that enable the SCTE-55-2 Out-of-Band protocol support.

Information about OFDMA Channel Configuration

DOCSIS 3.1 introduces modes for higher throughput and higher spectral efficiency while still allowing backward compatibility to DOCSIS 3.0. Orthogonal Frequency Division Multiple Access (OFDMA) channel has following features:

  • Frequency-range up to 96 MHz

  • Upstream spectrum 5 – 204 MHz

  • 25 KHz and 50 KHz subcarrier spacing

Modulation Profile

A globally configured OFDMA modulation profile defines modulation orders and pilot patterns for different interval usage codes (IUC). It is also used to assign parameters for initial ranging and fine ranging.

Modulation Order

Support

BPSK

Yes

QPSK

Yes

8-QAM

Yes

16-QAM

Yes

32-QAM

Yes

64-QAM

Yes

128-QAM

Yes

256-QAM

Yes

512-QAM

Yes

1024-QAM

Yes

2048-QAM

Yes

4096-QAM

No

OFDMA Channel Exclusion Band

Ranges of frequencies can be excluded from all OFDMA channels on a port using the ofdma-frequency-exclusion-band command.

Exclusion and unused bands apply to OFDMA channels only. OFDMA channel never use frequencies in the exclusion band. So the legacy SC-QAM channel can be placed in this band. OFDMA channel does not use frequencies in the unused band set by ofdma-frequency-unused-band command for data traffic, but can send probes in them.

TLV66 OFDMA Configuration Read

When the RPD receives a TLV66 read-request for the configured OFDMA channels, it sends a TLV66 read-response message for the following OFDMA attributes.

If the OFDMA channel that is specified in the read-request is invalid or not configured, the RPD sends a read-response with error code and error message.

  • AdminState(66.1)

  • SubcarrierZeroFreq(66.3)

  • FirstActiveSubcarrierNum(66.4)

  • LastActiveSubcarrierNum(66.5)

  • RollOffPeriod(66.6)

  • CyclicPrefix(66.7)

  • SubcarrierSpacing(66.8)

  • NumSymbolsPerFrame(66.9)

  • NumActiveSubcarriers(66.10)

  • StartingMinislot(66.11)

  • PreambleString(66.12)

  • TargetRxPowerAdjust(66.13)

  • EnableFlowTags(66.14)

  • ScramblerSeed(66.15)

  • ConfigMultiSectionTimingMer(66.16)

  • BwReqAggrControlOfdma(66.17)

  • UsChanId(66.18)

  • ConfigChangeCount(66.19)

  • DsChanId(66.20)

  • BroadcastImRegionDuration(66.21)

  • UnicastImRegionDuration(66.22)

Configure OFDMA Channel

Configure OFDMA Modulation Profile

The OFDMA modulation profile is used to configure initial ranging, fine ranging and data IUC parameters. To define the ofdma modulation profile to be applied to OFDMA channels, follow the steps below: 

enable 
configure terminal 
cable mod-profile-ofdma id 
subcarrier-spacing value  
initial-rng-subcarrier value  
fine-rng-subcarrier value  
data-iuc id modulation value pilot-pattern value

Here is a configuration example:

Router# enable
Router# configure terminal
Router(config)# cable mod-profile-ofdma 425
  Router(config-ofdma-mod-profile)# subcarrier-spacing 25KHz
  Router(config-ofdma-mod-profile)# initial-rng-subcarrier 64
  Router(config-ofdma-mod-profile)# fine-rng-subcarrier 192
  Router(config-ofdma-mod-profile)# data-iuc 5 modulation 2048-QAM pilot-pattern 11
  Router(config-ofdma-mod-profile)# data-iuc 6 modulation 1024-QAM pilot-pattern 11
  Router(config-ofdma-mod-profile)# data-iuc 9 modulation 256-QAM pilot-pattern 11
  Router(config-ofdma-mod-profile)# data-iuc 10 modulation 128-QAM pilot-pattern 11
  Router(config-ofdma-mod-profile)# data-iuc 11 modulation 64-QAM pilot-pattern 11
  Router(config-ofdma-mod-profile)# data-iuc 12 modulation 32-QAM pilot-pattern 11
  Router(config-ofdma-mod-profile)# data-iuc 13 modulation 16-QAM pilot-pattern 11
Router# enable
Router# configure terminal
Router(config)# cable mod-profile-ofdma 451
Router(config-ofdma-mod-profile)# subcarrier-spacing 50KHz
Router(config-ofdma-mod-profile)# initial-rng-subcarrier 64
Router(config-ofdma-mod-profile)# fine-rng-subcarrier 128
Router(config-ofdma-mod-profile)# data-iuc 13 modulation 1024-QAM pilot-pattern 2
Router(config-ofdma-mod-profile)# exit
Router(config)# cable mod-profile-ofdma 472
Router(config-ofdma-mod-profile)# subcarrier-spacing 25KHz
Router(config-ofdma-mod-profile)# initial-rng-subcarrier 64
Router(config-ofdma-mod-profile)# fine-rng-subcarrier 128
Router(config-ofdma-mod-profile)# data-iuc 6 modulation 1024-QAM pilot-pattern 8
Router(config-ofdma-mod-profile)# data-iuc 9 modulation 1024-QAM pilot-pattern 8
Router(config-ofdma-mod-profile)# data-iuc 10 modulation 512-QAM pilot-pattern 8
Router(config-ofdma-mod-profile)# data-iuc 11 modulation 256-QAM pilot-pattern 8
Router(config-ofdma-mod-profile)# data-iuc 12 modulation 128-QAM pilot-pattern 9
Router(config-ofdma-mod-profile)# data-iuc 13 modulation 64-QAM pilot-pattern 9

Note

  • Subcarrier spacing must match the subcarrier spacing of each channel profile in which it is configured.

  • Modulation profiles 421 and 461 are the default modulation profiles for 25 KHz and 50 KHz subcarrier spacing respectively. You can add additional modulation profiles. The modulation profile range is between 401-500.

  • You must configure subcarrier spacing, ranging, and data IUC 13 before applying modulation profile to a upstream channel.

  • Regular pilot patterns (1-4/8-11) and boosted pilot patterns (5-7/12-14) cannot co-exist on the same upstream channel.

  • We recommendto not change subcarrier spacing, ranging, and data IUC configuration of a modulation profile that is applied to a channel.

Verify OFDMA Modulation Profile Configuration

To display the OFDMA modulation profile details, use the show cable modulation-profile ofdma command as shown in the following example: 

Router# show cable modulation-profile ofdma
Mod  Subc     IUC type   Act  Preamble  Bit       Pilot
     Spacing             subc Symbols   Loading   Pattern
421  25KHz    3  (IR)    64      4     
              4  (FR)    192     1     
              13 (data)                16-QAM    8       
              
423  25KHz    3  (IR)    64      4     
              4  (FR)    128     1     
              6  (data)                1024-QAM  8       
              10 (data)                512-QAM   8       
              11 (data)                256-QAM   8       
              12 (data)                128-QAM   9       
              13 (data)                64-QAM    9       
                           
461  50KHz    3  (IR)    32      4     
              4  (FR)    192     1     
              13 (data)                16-QAM    1         
			  
466  50KHz    3  (IR)    64      4     
              4  (FR)    128     1     
              13 (data)                1024-QAM  2

Configure OFDMA Channel

To configure the OFDMA channel, follow these steps:

enable 
configure terminal 
cable upstream controller-profile id 
us-channel id docsis-mode ofdma 
us-channel id subcarrier-spacing value 
us-channel id modulation-profile id 
us-channel id frequency-range start-value end-value 
us-channel id initial-rng-frequency-start value 
us-channel id cyclic-prefix value roll-off-period value 
us-channel id symbols-per-frame value 
us-channel id data-iuc id band start-value end-value modulation value pilot-pattern value

To use QAM modulation in between specific bandwidth, use the us-channel id data-iuc id band start-value end-value modulation value pilot-pattern value command.

Here is a configuration example:

Router# enable
Router# configure terminal
Router(config)# cable upstream controller-profile 1
Router(config-controller-profile)# us-channel 12 docsis-mode ofdma
Router(config-controller-profile# us-channel 12 subcarrier-spacing 25KHz
Router(config-controller-profile)# us-channel 12 frequency-range 40000000 85000000
Router(config-controller-profile)# us-channel 12 modulation-profile 423
Router(config-controller-profile)# us-channel 12 cyclic-prefix 640 roll-off-period 224
Router(config-controller-profile)# us-channel 12 symbols-per-frame 9
Router(config-controller-profile)# us-channel 12 data-iuc 9 band 50000000 60000000 modulation 512-QAM pilot-pattern 8
Router(config-controller-profile)# no us-channel 12 shutdown

This is a configuration example for two OFDMA channels in Remote PHY deployment:

Router# enable
Router# configure terminal
Router(config)# cable upstream controller profile 1
Router(config-controller-profile)# us-channel 12 docsis-mode ofdma
Router(config-controller-profile)# us-channel 12 subcarrier-spacing 25KHz
Router(config-controller-profile)# us-channel 12 modulation-profile 423
Router(config-controller-profile)# us-channel 12 frequency-range 40000000 85000000
Router(config-controller-profile)# us-channel 12 initial-rng-frequency-start 50000000
Router(config-controller-profile)# us-channel 12 cyclic-prefix 96 roll-off-period 64
Router(config-controller-profile)# us-channel 12 symbols-per-frame 12
Router(config-controller-profile)# no us-channel 12 shutdown
Router(config-controller-profile)# us-channel 13 docsis-mode ofdma
Router(config-controller-profile)# us-channel 13 subcarrier-spacing 25KHz
Router(config-controller-profile)# us-channel 13 modulation-profile 423
Router(config-controller-profile)# us-channel 13 frequency-range 108000000 204000000
Router(config-controller-profile)# us-channel 13 initial-rng-frequency-start 118000000
Router(config-controller-profile)# us-channel 13 cyclic-prefix 96 roll-off-period 64
Router(config-controller-profile)# us-channel 13 symbols-per-frame 12
Router(config-controller-profile)# no us-channel 13 shutdown

Router# configure terminal
Router(config)# cable rpd rpd-20
Router(config-rpd)# description RPD20
Router(config-rpd)# identifier badb.1111.1111
Router(config-rpd)# core-interface Te7/1/3
Router(config-rpd-core)# principal
Router(config-rpd-core)# rpd-ds 0 downstream-cable 7/0/31 profile 2
Router(config-rpd-core)# rpd-us 0 upstream-cable 7/0/63 profile 1

Note

  • A maximum of one OFDMA channel can be configured per controller. For this OFDMA channel, the us-channel index must be set to 12. This corresponds with OFDMA channel 0 on an RPD port. Starting from Cisco IOS XE Bengaluru 17.6.1x release, you can configure two OFDMA channels in Remote PHY deployment.

  • Change docsis-mode to OFDMA to enable OFDMA configuration options. These options are enabled by default on us-channel 12.

  • We recommend that you configure no more than 4 active SC-QAMs while an OFDMA channel is present.

  • OFDMA channel can be placed between 5 Mhz and 204 Mhz.

  • Values of the options are often interdependent, changing one value may change other values or make them invalid.

  • We recommend that you set subcarrier spacing and frequency range first. To achieve a higher OFDMA channel traffic throughput, configure OFDMA channel with 25kHz subcarrier spacing.

  • Maximum of 4:1 upstream combining for OFDMA channels is supported.

  • Each CBR-CCAP-LC-G2-R card supports a maximum of 32 OFDMA channels.

Bind Upstream Controllers With RPHY Ports

If the upstream channel profile contains ODFMA channel, you can bind up to four RPD ports with the upstream controller.

cable rpd node1
 identifier badb.ad15.1288
 core-interface Te7/1/4
   principal
   rpd-ds 0 downstream-cable 7/0/30 profile 10
   rpd-us 0 upstream-cable 7/0/63 profile 1
   rpd-us 1 upstream-cable 7/0/63 profile 1

cable rpd node2
 identifier badb.ad15.1290
 core-interface Te7/1/4
   principal
   rpd-ds 0 downstream-cable 7/0/31 profile 10
   rpd-us 0 upstream-cable 7/0/63 profile 1
   rpd-us 1 upstream-cable 7/0/63 profile 1

Verify OFDMA Channel Configuration

To display the OFDMA channel configuration, use the show controllers upstream-Cable us-channel command as shown in the example below: 

Router# show controllers upstream-Cable 1/0/4 us-channel 12
Controller RPD US Port List:
DevID RPD ID US Port I/F Name
------ --------------- -------- --------- ------------ 
0 badb.ad13.acfe 0 Te1/1/2 necker-5 

USPHY OFDMA support: FULL 
 

Controller 1/0/4 upstream 12  AdminState:UP OpState: UP
  ofdma mode enabled
  Channel Freq Range 35.500 MHz to 79.500 MHz
  Channel Subcarrier Index Range Cfg: 74, 953 Op: 74, 953
  Channel SC0 Freq Cfg: 31.800 MHz Op: 31.800 MHz
  #Excl bands: 2
  (   0,   73), ( 954, 2047), 
  #Unused bands: 0
  Cyclic Prefix Size 96,  Rolloff Period Size 64
  Subcarrier Spacing 50KHz,  Symbols Per Frame 18 Subcarrier Per Minislot: 8

  Modulation Profile (ID 466, Subcarrier Spacing 50KHz)
    IUC type   Cfg   Act  Preamble Bit       Pilot
               subc  subc Symbols  Loading   Pattern
    3  (IR)    64    64      4       -         -
    4  (FR)    128   128     1       -         -
    13 (data)  -     -      -     1024-QAM    2       
  Calculated Data burst profile:
  IUC  Group   Bit       Pilot   Start  Consec
               Loading   Pattern Mslot  Mslot
  13   0       1024-QAM  2       0       109     

  #Total mslots:110 #Fine Rng capable:95 #Initial Rng capable:103
   Initial Rng - Freq 50.000MHz mslotOffset:36 #mslot in frame:8  
  Minislot mapping:  mslot#(start_sc start_freq(Mhz) end_sc end_freq(Mhz)
   mslot type(E-Edge; B-Body; S-Share with SCQAM; 
   I-Initial rng capable; F-Fine rng capable) 
   (next Fine Rng capable minislot if current is not capable))
  0  (  74, 35.500,   81, 35.850, EIF ( - )), 1  (  82, 35.900,   89, 36.250, BIF ( - )), 
  2  (  90, 36.300,   97, 36.650, BIF ( - )), 3  (  98, 36.700,  105, 37.050, BIF ( - )), 
  4  ( 106, 37.100,  113, 37.450, BIF ( - )), 5  ( 114, 37.500,  121, 37.850, BIF ( - )), 
  6  ( 122, 37.900,  129, 38.250, BIF ( - )), 7  ( 130, 38.300,  137, 38.650, BIF ( - )), 
  8  ( 138, 38.700,  145, 39.050, BIF ( - )), 9  ( 146, 39.100,  153, 39.450, BIF ( - )), 
  10 ( 154, 39.500,  161, 39.850, BIF ( - )), 11 ( 162, 39.900,  169, 40.250, BIF ( - )), 
  12 ( 170, 40.300,  177, 40.650, BIF ( - )), 13 ( 178, 40.700,  185, 41.050, BIF ( - )), 
  14 ( 186, 41.100,  193, 41.450, BIF ( - )), 15 ( 194, 41.500,  201, 41.850, BIF ( - )), 
  16 ( 202, 41.900,  209, 42.250, BIF ( - )), 17 ( 210, 42.300,  217, 42.650, BIF ( - )), 
  18 ( 218, 42.700,  225, 43.050, BIF ( - )), 19 ( 226, 43.100,  233, 43.450, BIF ( - )), 
  20 ( 234, 43.500,  241, 43.850, BIF ( - )), 21 ( 242, 43.900,  249, 44.250, BIF ( - )), 
  22 ( 250, 44.300,  257, 44.650, BIF ( - )), 23 ( 258, 44.700,  265, 45.050, BIF ( - )), 
  24 ( 266, 45.100,  273, 45.450, BIF ( - )), 25 ( 274, 45.500,  281, 45.850, BIF ( - )),      
  26 ( 282, 45.900,  289, 46.250, BIF ( - )), 27 ( 290, 46.300,  297, 46.650, BIF ( - )), 
  28 ( 298, 46.700,  305, 47.050, BIF ( - )), 29 ( 306, 47.100,  313, 47.450, BIF ( - )), 
  30 ( 314, 47.500,  321, 47.850, BIF ( - )), 31 ( 322, 47.900,  329, 48.250, BIF ( - )), 
  32 ( 330, 48.300,  337, 48.650, BIF ( - )), 33 ( 338, 48.700,  345, 49.050, BIF ( - )), 
  34 ( 346, 49.100,  353, 49.450, BIF ( - )), 35 ( 354, 49.500,  361, 49.850, BIF ( - )), 
  36 ( 362, 49.900,  369, 50.250, BIF ( - )), 37 ( 370, 50.300,  377, 50.650, BIF ( - )), 
  38 ( 378, 50.700,  385, 51.050, BIF ( - )), 39 ( 386, 51.100,  393, 51.450, BIF ( - )), 
  40 ( 394, 51.500,  401, 51.850, BIF ( - )), 41 ( 402, 51.900,  409, 52.250, BIF ( - )), 
  42 ( 410, 52.300,  417, 52.650, BIF ( - )), 43 ( 418, 52.700,  425, 53.050, BIF ( - )), 
  44 ( 426, 53.100,  433, 53.450, BIF ( - )), 45 ( 434, 53.500,  441, 53.850, BIF ( - )), 
  46 ( 442, 53.900,  449, 54.250, BIF ( - )), 47 ( 450, 54.300,  457, 54.650, BIF ( - )), 
  48 ( 458, 54.700,  465, 55.050, BIF ( - )), 49 ( 466, 55.100,  473, 55.450, BIF ( - )), 
  50 ( 474, 55.500,  481, 55.850, BIF ( - )), 51 ( 482, 55.900,  489, 56.250, BIF ( - )), 
  52 ( 490, 56.300,  497, 56.650, BIF ( - )), 53 ( 498, 56.700,  505, 57.050, BIF ( - )), 
  54 ( 506, 57.100,  513, 57.450, BIF ( - )), 55 ( 514, 57.500,  521, 57.850, BIF ( - )), 
  56 ( 522, 57.900,  529, 58.250, BIF ( - )), 57 ( 530, 58.300,  537, 58.650, BIF ( - )), 
  58 ( 538, 58.700,  545, 59.050, BIF ( - )), 59 ( 546, 59.100,  553, 59.450, BIF ( - )), 
  60 ( 554, 59.500,  561, 59.850, BIF ( - )), 61 ( 562, 59.900,  569, 60.250, BIF ( - )), 
  62 ( 570, 60.300,  577, 60.650, BIF ( - )), 63 ( 578, 60.700,  585, 61.050, BIF ( - )), 
  64 ( 586, 61.100,  593, 61.450, BIF ( - )), 65 ( 594, 61.500,  601, 61.850, BIF ( - )), 
  66 ( 602, 61.900,  609, 62.250, BIF ( - )), 67 ( 610, 62.300,  617, 62.650, BIF ( - )), 
  68 ( 618, 62.700,  625, 63.050, BIF ( - )), 69 ( 626, 63.100,  633, 63.450, BIF ( - )), 
  70 ( 634, 63.500,  641, 63.850, BIF ( - )), 71 ( 642, 63.900,  649, 64.250, BIF ( - )), 
  72 ( 650, 64.300,  657, 64.650, BIF ( - )), 73 ( 658, 64.700,  665, 65.050, BIF ( - )), 
  74 ( 666, 65.100,  673, 65.450, BIF ( - )), 75 ( 674, 65.500,  681, 65.850, BIF ( - )), 
  76 ( 682, 65.900,  689, 66.250, BIF ( - )), 77 ( 690, 66.300,  697, 66.650, BIF ( - )), 
  78 ( 698, 66.700,  705, 67.050, BIF ( - )), 79 ( 706, 67.100,  713, 67.450, BIF ( - )), 
  80 ( 714, 67.500,  721, 67.850, BIF ( - )), 81 ( 722, 67.900,  729, 68.250, BIF ( - )), 
  82 ( 730, 68.300,  737, 68.650, BIF ( - )), 83 ( 738, 68.700,  745, 69.050, BIF ( - )), 
  84 ( 746, 69.100,  753, 69.450, BIF ( - )), 85 ( 754, 69.500,  761, 69.850, BIF ( - )), 
  86 ( 762, 69.900,  769, 70.250, BIF ( - )), 87 ( 770, 70.300,  777, 70.650, BIF ( - )), 
  88 ( 778, 70.700,  785, 71.050, BIF ( - )), 89 ( 786, 71.100,  793, 71.450, BIF ( - )), 
  90 ( 794, 71.500,  801, 71.850, BIF ( - )), 91 ( 802, 71.900,  809, 72.250, BIF ( - )), 
  92 ( 810, 72.300,  817, 72.650, BIF ( - )), 93 ( 818, 72.700,  825, 73.050, BIF ( - )), 
  94 ( 826, 73.100,  833, 73.450, BIF ( - )), 95 ( 834, 73.500,  841, 73.850, BI  (0  )), 
  96 ( 842, 73.900,  849, 74.250, BI  (0  )), 97 ( 850, 74.300,  857, 74.650, BI  (0  )), 
  98 ( 858, 74.700,  865, 75.050, BI  (0  )), 99 ( 866, 75.100,  873, 75.450, BI  (0  )), 
  100( 874, 75.500,  881, 75.850, BI  (0  )), 101( 882, 75.900,  889, 76.250, BI  (0  )), 
  102( 890, 76.300,  897, 76.650, BI  (0  )), 103( 898, 76.700,  905, 77.050, B   (0  )), 
  104( 906, 77.100,  913, 77.450, B   (0  )), 105( 914, 77.500,  921, 77.850, B   (0  )), 
  106( 922, 77.900,  929, 78.250, B   (0  )), 107( 930, 78.300,  937, 78.650, B   (0  )), 
  108( 938, 78.700,  945, 79.050, B   (0  )), 109( 946, 79.100,  953, 79.450, B   (0  )), 

  Mapped to connector 4 and receiver 108
          
  Bind to Cable1/0/4 US4
  MER(SNR) - Unknown - no modems online.
  Spectrum Group is unassigned
  Nominal Input Power Level 0 dBmV

  UCD procedures on lch 0  
  UCD ucd-proxy-timeout   (0   ) ucd-proxy-wrong-ack (0   )

Verify the TLV66 OFDMA Configuration Read

R-PHY#show ofdma config
OFDMA Channel Configuration
RF Port                             : 0
RF channel                          : 0
State                               : UP
Starting Minislot                   : 2212398931
Target Rx Power Adjust              : 0
Enable Flow Tags                    : 1
Max Req Block Enq Timeout           : 0
Max Req Block Enq Number            : 0
Broadcast Im Region Duration        : 6
Unicast Im Region Duration          : 6
UCD Message
  UCD fields
    UCID                            : 8
    CCC                             : 78
    DSID                            : 0
    TLV 24 Change Bitmask           : 0x0000
    TLV 25 Timestamp Snapshot       : 08 3d e8 75 32 25 b7 b2 24 
    TLV 26 Cyclic Prefix            : 96
    TLV 27 Rolloff Period           : 64 samples
    TLV 28 Subcarrier Spacing       : 25 KHz
    TLV 29 Subcarrier Zero Freq     : 36800000 Hz
    TLV 32 Symbols in Frame         : 9
    TLV 33 Randomization Seed       : 8153946
    TLV 3 Preamble String           : Preamble Superstring
      ff d7 d5 21 26 ec e5 e7 00 78 7f 63 6b 35 2e 29
      00 88 81 a5 bd 5f 72 7b 01 99 82 ee c7 e1 96 8d
      02 aa 87 33 48 22 bb 97 07 ff 89 55 d8 67 cc b9
      00 80 9b fe 68 a8 55 cb 00 18 1a c2 b9 f8 fe 5d
    TLV 6 Preamble String Extension : Preamble Superstring Extension
    TLV 30 Subcarrier Exclusion Band: Excluded Subcarriers
      [0000 - 0147]  [1908 - 4095]
    TLV 30 Subcarrier Unused Band   : Unused Subcarriers
    TLV 23 Burst Descriptor         : Burst Descriptor
      03 03 02 01 00 04 02 00 00 13 02 00 40
    TLV 23 Burst Descriptor         : Burst Descriptor
      04 03 02 01 00 04 02 00 00 14 02 01 00
    TLV 23 Burst Descriptor         : Burst Descriptor
      05 15 02 a8 6d
    TLV 23 Burst Descriptor         : Burst Descriptor
      09 15 02 98 6d
    TLV 23 Burst Descriptor         : Burst Descriptor
      0d 15 02 88 6d

OFDMA Channel Configuration
RF Port                             : 1
RF channel                          : 0
State                               : UP
Starting Minislot                   : 2212522598
Target Rx Power Adjust              : 0
Enable Flow Tags                    : 1
Max Req Block Enq Timeout           : 0
Max Req Block Enq Number            : 0
Broadcast Im Region Duration        : 5
Unicast Im Region Duration          : 5
UCD Message
  UCD fields
    UCID                            : 9
    CCC                             : 82
    DSID                            : 0
    TLV 24 Change Bitmask           : 0x0000
    TLV 25 Timestamp Snapshot       : 08 3e 06 a6 64 87 a8 59 d4 
    TLV 26 Cyclic Prefix            : 512
    TLV 27 Rolloff Period           : 224 samples
    TLV 28 Subcarrier Spacing       : 25 KHz
    TLV 29 Subcarrier Zero Freq     : 1800000 Hz
    TLV 32 Symbols in Frame         : 9
    TLV 33 Randomization Seed       : 8153946
    TLV 3 Preamble String           : Preamble Superstring
      ff d7 d5 21 26 ec e5 e7 00 78 7f 63 6b 35 2e 29
      00 88 81 a5 bd 5f 72 7b 01 99 82 ee c7 e1 96 8d
      02 aa 87 33 48 22 bb 97 07 ff 89 55 d8 67 cc b9
      00 80 9b fe 68 a8 55 cb 00 18 1a c2 b9 f8 fe 5d
    TLV 6 Preamble String Extension : Preamble Superstring Extension
    TLV 30 Subcarrier Exclusion Band: Excluded Subcarriers
      [0000 - 0147]  [0688 - 1768]  [3308 - 4095]
    TLV 30 Subcarrier Unused Band   : Unused Subcarriers
      [0676 - 0687]  [3305 - 3307]
    TLV 23 Burst Descriptor         : Burst Descriptor
      03 03 02 00 80 04 02 00 00 13 02 00 20
    TLV 23 Burst Descriptor         : Burst Descriptor
      04 03 02 00 c0 04 02 00 00 14 02 00 c0
    TLV 23 Burst Descriptor         : Burst Descriptor
      05 15 02 b8 80
    TLV 23 Burst Descriptor         : Burst Descriptor
      06 15 02 a8 80
    TLV 23 Burst Descriptor         : Burst Descriptor
      09 15 02 98 80
    TLV 23 Burst Descriptor         : Burst Descriptor
      0a 15 02 88 80
    TLV 23 Burst Descriptor         : Burst Descriptor
      0b 15 02 78 80
    TLV 23 Burst Descriptor         : Burst Descriptor
      0c 15 02 68 80
    TLV 23 Burst Descriptor         : Burst Descriptor
      0d 15 02 48 80

Configure Exclusion / Unused Bands

An OFDMA channel never uses frequencies that are located in exclusion bands. OFDMA probes are sent on frequencies that are located in the unused bands. Therefore exclusion bands must be used to prevent interference with SC-QAM channels. To configure the Exclusion / Unused Bands, follow these steps: 

enable 
configure terminal 
cable upstream controller-profile id 
cable ofdma-frequency-exclusion-band start-value end-value 
cable ofdma-frequency-unused-band start-value end-value

Here is a configuration example:

Router# enable
Router# configure terminal
Router(config)# cable upstream controller-profile 33
Router(config-controller-profile)# cable ofdma-frequency-exclusion-band 48000000 54200000
Router(config-controller-profile)# cable ofdma-frequency-unused-band 50000000 52000000
Router(config-controller-profile)# us-channel 12 docsis-mode ofdma
Router(config-controller-profile)# us-channel 12 subcarrier-spacing 25KHz
Router(config-controller-profile)# us-channel 12 modulation-profile 423
Router(config-controller-profile)# us-channel 12 frequency-range 45000000 70000000
Router(config-controller-profile)# us-channel 12 cyclic-prefix 96 roll-off-period 64
Router(config-controller-profile)# us-channel 12 symbols-per-frame 18

Verify Exclusion / Unused Bands

To display the Exclusion / Unused Band configuration, use the show controllers upstream-Cable us-channel command as shown in the following example: 

Router# show controllers upstream-Cable 1/0/2 us-channel 12
USPHY OFDMA support: FULL 

Controller Exclusion Freq List:
( 40.000 MHz, 44.200 MHz), 
Controller Unused Freq List:
( 50.000 MHz, 52.000 MHz), 

Controller 1/0/9 upstream 12 AdminState:UP OpState: UP
ofdma mode enabled
Channel Freq Range 28.500 MHz to 69.500 MHz
Channel Subcarrier Index Range Cfg: 148, 1787 Op: 148, 1787
Channel SC0 Freq Cfg: 24.800 MHz Op: 24.800 MHz
#Excl bands: 3
( 0, 147), ( 608, 776), (1788, 4095), 
#Unused bands: 3
( 596, 607), (1001, 1088), (1777, 1787),

Override OFDMA Modulation Profile Per Channel

It is possible to override the modulation and pilot pattern that is used by a particular IUC on a given OFDMA channel as shown with the following command. 

enable 
configure terminal 
cable upstream controller profile id 
us-channel id data-iuc id band start-value end-value modulation value pilot-pattern value

Here is a configuration example:

Router# enable
Router# configure terminal
Router(config)# cable upstream controller profile 33
Router(config-controller-profile)# us-channel 12 docsis-mode ofdma
Router(config-controller-profile)# us-channel 12 subcarrier-spacing 25KHz
Router(config-controller-profile)# us-channel 12 modulation-profile 423
Router(config-controller-profile)# us-channel 12 frequency-range 28000000 70000000
Router(config-controller-profile)# us-channel 12 cyclic-prefix 96 roll-off-period 64
Router(config-controller-profile)# us-channel 12 symbols-per-frame 18
Router(config-controller-profile)# us-channel 12 data-iuc 6 band 60000000 65000000 modulation 128-QAM pilot-pattern 9
Router(config-controller-profile)# no us-channel 12 shutdown

Note

Override values are removed from the US channel when changing modulation profile, including when the profile changes due to changes in subcarrier spacing.

Verify Override Configuration

To display the override configuration, use the show controllers upstream-Cable us-channel command as shown in the following example: 

Router# show controllers upstream-Cable 1/0/2 us-channel 12 
 .....
   Modulation Profile (ID 423, Subcarrier Spacing 25KHz)
    IUC type   Cfg   Act  Preamble Bit       Pilot
               subc  subc Symbols  Loading   Pattern
    3  (IR)    64    64      4       -         -
    4  (FR)    128   128     1       -         -
    6  (data)  -     -      -     1024-QAM    8       
    10 (data)  -     -      -     512-QAM     8       
    11 (data)  -     -      -     256-QAM     8       
    12 (data)  -     -      -     128-QAM     9       
    13 (data)  -     -      -     64-QAM      9       
  Overwrite Data Profile:                                            
  IUC  Start      End        Start   End    Bit       Pilot
       Freq(MHz)  Freq(MHz)  Subc    Subc   Loading   Pattern
  6      60.0      65.0      1408    1608   128-QAM   9       

  Calculated Data burst profile:
  IUC  Group   Bit       Pilot   Start  Consec
               Loading   Pattern Mslot  Mslot
  6    0       1024-QAM  8       0       61      
  6    1       128-QAM   9       62      11      
  6    2       1024-QAM  8       74      10     
  10   0       512-QAM   8       0       84      
  11   0       256-QAM   8       0       84      
  12   0       128-QAM   9       0       84      
  13   0       64-QAM    9       0       84      
 ......

Bind OFDMA Channel Profile to Controller

To bind OFDMA channel profile to a controller, follow this example:

cable virtual-service-group sg-upstream-7-0-63 upstream-cable 7/0/63 profile 1

cable rpd node1
 identifier badb.ad15.1288
 core-interface Te7/1/4
   principal
   rpd-ds 0 downstream-cable 7/0/30 profile 10
   rpd-us 1 upstream-cable 7/0/63 profile 1

Note

We recommend using separate channel profiles to debug issues on specific RPD port.

Bind OFDMA Upstream to Cable Interface

To associate upstream channels with a MAC domain and configure upstream bonding, follow these steps:

enable 
configure terminal 
interface Cable slot/subslot/interface 
upstream id Upstream-Cable slot/subslot/interface us-channel id 
cable upstream bonding-group id 
upstream id 
attributes value 
cable bundle id

Here is a configuration example:

Router# enable
Router# configure terminal
Router(config)# interface Cable 1/0/4
Router(config-if)# downstream Integrated-Cable 1/0/4 rf-channel 0
Router(config-if)# downstream Integrated-Cable 1/0/4 rf-channel 16
Router(config-if)# upstream 0 Upstream-Cable 1/0/0 us-channel 0
Router(config-if)# upstream 1 Upstream-Cable 1/0/0 us-channel 1
Router(config-if)# upstream 2 Upstream-Cable 1/0/0 us-channel 2
Router(config-if)# upstream 3 Upstream-Cable 1/0/0 us-channel 3
Router(config-if)# upstream 6 Upstream-Cable 1/0/0 us-channel 12
Router(config-if)# cable upstream bonding-group 1
Router(config-upstream-bonding)# upstream 0
Router(config-upstream-bonding)# upstream 1
Router(config-upstream-bonding)# upstream 2
Router(config-upstream-bonding)# upstream 3
Router(config-upstream-bonding)# attributes 80000000
Router(config-upstream-bonding)# exit
Router(config-if)# cable upstream bonding-group 2
Router(config-upstream-bonding)# upstream 0
Router(config-upstream-bonding)# upstream 1
Router(config-upstream-bonding)# upstream 2
Router(config-upstream-bonding)# upstream 3
Router(config-upstream-bonding)# upstream 6
Router(config-upstream-bonding)# attributes 80000000
Router(config-upstream-bonding)# exit
Router(config-if)# cable bundle 1

Determine DOCSIS 3.1 Cable Modems and the Cable Modems Using OFDMA Upstreams

To display the DOCSIS 3.1 cable modem, use the show cable modem docsis version d31-capable command as shown in the following example: 

Router# show cable modem docsis version d31-capable
MAC Address    I/F            MAC               Reg Oper DSxUS DS   RCC   US
                              State             Ver Ver        OFDM ID    OFDMA
4800.33ea.7012 C1/0/0/UB      w-online(pt)      3.1 3.1  33x4  1    5     1        
203d.66ae.4169 C1/0/0/UB      w-online(pt)      3.1 3.1  33x4  1    5     1

To display DOCSIS PHY layer information for the cable modem, use the show cable modem phy command as shown in the following example: 

Router# show cable modem 5039.5584.5bbe phy
MAC Address    I/F        Sid   USPwr  USMER Timing DSPwr  DSMER  Mode   DOCSIS
                                (dBmV) (SNR) Offset (dBmV) (SNR)         Prov 
                                       (dB)                (dB)
5039.5584.5bbe C1/0/0/U0  15    38.75  ----- 2282   0.00   -----  ofdma  1.1

To display the cable modem using OFDMA upstream, use the show cable modem phy command as shown in the following example: 

Router# show cable modem phy | include ofdma
5039.5584.5bbe C1/0/0/U0     15    38.75  ----- 2282    0.00  -----  ofdma  1.1
0895.2a9b.26f1 C1/0/0/U0     16    28.00  ----- 2146    0.00  -----  ofdma  1.1

To display the OFDMA channel capacity and utilization, use the show interface cable mac-scheduler command as shown in the following example: 

Router# show interfaces cable 1/0/2 mac-scheduler 6
     DOCSIS 1.1 MAC scheduler for Cable1/0/2/U6 : rate 279807192
     Max potential performance for each configured IUC type
     IUC: 6     rate: 279807192
     IUC: 10    rate: 263104848
     IUC: 11    rate: 233779840
     IUC: 12    rate: 203019328
     IUC: 13    rate: 173899376
     wfq:None 
     us_balance:OFF 
     dpon_mode:OFF 
     fairness:OFF 
     Queue[Rng Polls] flows 0
     Queue[CIR Grants] flows 0
     Queue[BE(07) Grants] flows 0
     Queue[BE(06) Grants] flows 0
     Queue[BE(05) Grants] flows 0
     Queue[BE(04) Grants] flows 0
     Queue[BE(03) Grants] flows 0
     Queue[BE(02) Grants] flows 0
     Queue[BE(01) Grants] flows 0
     Queue[BE(00) Grants] flows 0
     Req Slots 38510548 
     Req/Data Slots 1275
     Init Mtn Slots 47832
     Stn Mtn Slots 0
     IUC 5 Slots 0
     IUC 6 Slots 6378
     IUC 9 Slots 0
     IUC 10 Slots 254923830
     IUC 11 Slots 220
     IUC 12 Slots 4006
     IUC 13 Slots 251213508
     Avg upstream channel utilization : 0%
     Avg upstream channel utilization in 30 sec : 0%
     Avg percent contention slots : 96%
     Avg percent initial ranging slots : 0%
     Avg percent minislots lost on late MAPs : 0%

     MAP TSS: lch_state 10, init_retries 0
              late_initial_maps 0, late_ucd_maps 0
              mac-phy tss errors 0, missed ccc 0

Verify DOCSIS 3.1 Upstream OFDMA Channel Bonding Across DOCSIS 3.0 ATDMA Channels

DOCSIS 3.1 Upstream OFDMA channel can be bonded with DOCSIS 3.0 ATDMA channel. If the user wants to utilize non-best effort flows, it is recommended to bond the OFDMA channel with one or more ATDMA channels. A maximum of 1 OFDMA channel and 4 ATDMA channels can be bonded together.

Below is an output example showing the bonding group 8 has both OFDMA (channel 12) and ATDMA channels (channel 0, 1, 2, 3).

interface Cable6/0/0
downstream Integrated-Cable 6/0/0 rf-channel 1
downstream Integrated-Cable 6/0/0 rf-channel 158
upstream 0 Upstream-Cable 6/0/0 us-channel 0
upstream 1 Upstream-Cable 6/0/0 us-channel 1
upstream 2 Upstream-Cable 6/0/0 us-channel 2
upstream 3 Upstream-Cable 6/0/0 us-channel 3
upstream 6 Upstream-Cable 6/0/0 us-channel 12
cable upstream bonding-group 1
  upstream 0
  upstream 1
  upstream 2
  upstream 3
  attributes 80000000
cable upstream bonding-group 8
  upstream 0
  upstream 1
  upstream 2
  upstream 3
  upstream 6
  attributes 80000000
cable bundle 1
cable privacy accept-self-signed-certificate
end

Support for Line Card High Availability

N+1 line card high availability (LCHA) is supported for modems that are assigned OFDMA upstream channels. If LCHA is enabled, the modems remain active after switchover and revert.

Enhancements for LCHA Associated with DPIC Interfaces

Table 2. Feature History

Feature Name

Release Information

Feature Description

Enhancements for LCHA Associated with DPIC Interfaces

Cisco IOS XE Dublin 17.12.1w

In this release, the robustness of LCHA associated with DPIC interfaces is enhanced. This enhancement decouples the downstream queue in SUP and DPIC interface datapath change during LCHA. This ensures that RPDs on the line card stay online even if the active SUP is experiencing a stuck queue event. See show platform hardware qfp active cable dpic-lcha if-name.

Support for Line Card Process Restart

Linecard IOSd and linecard US-Scheduler (CDMAN) process restart (LCPR) is supported for modems that are assigned OFDMA upstream channels. If LCPR is enabled, remote phy devices remain active after process restarts.

Feature Information for DOCSIS 3.1 OFDMA Channel Configuration

Use Cisco Feature Navigator to find information about the platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to the https://cfnng.cisco.com/ link. An account on the Cisco.com page is not required.


Note

The following table lists the software release in which a given feature is introduced. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Table 3. Feature Information for DOCSIS 3.1 OFDMA Channel Configuration

Feature Name

Releases

Feature Information

Remote PHY DOCSIS 3.1 OFDMA Channel Configuration

Cisco 1x2 / Compact Shelf RPD Software 5.1

Cisco IOS XE Fuji 16.9.1

This feature was introduced on the Cisco Remote PHY Device and Cisco cBR Series Converged Broadband Routers.

Support for Line Card High Availability

Cisco 1x2 / Compact Shelf RPD Software 6.1

Cisco IOS XE Gibraltar 16.10.1

This feature was introduced on the Cisco Remote PHY Device and Cisco cBR Series Converged Broadband Routers.

Support for Line Card Process Restart

Cisco 1x2 / Compact Shelf RPD Software 6.1

Cisco IOS XE Gibraltar 16.10.1

This feature was introduced on the Cisco Remote PHY Device and Cisco cBR Series Converged Broadband Routers.