DOCSIS 3.1 OFDM Channel Configuration
Hardware Compatibility Matrix for the Cisco cBR Series Routers
Information about OFDM Channel Configuration
How to Configure OFDM Channel
Configuration Examples
Additional References
Feature Information for DOCSIS 3.1 OFDM Channel Configuration

DOCSIS 3.1 OFDM Channel Configuration

This document describes how to configure the OFDM channel on the Cisco cBR Series Converged Broadband Router.

Hardware Compatibility Matrix for the Cisco cBR Series Routers

Note

The hardware components that are introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified.

Table 1. Hardware Compatibility Matrix for the Cisco cBR Series Routers
Cisco CMTS Platform	Processor Engine	Interface Cards
Cisco cBR-8 Converged Broadband Router	Cisco IOS-XE Release 16.5.1 and Later Releases Cisco cBR-8 Supervisor: PID—CBR-SUP-250G PID—CBR-CCAP-SUP-160G	Cisco IOS-XE Release 16.5.1 and Later Releases Cisco cBR-8 CCAP Line Cards: PID—CBR-LC-8D30-16U30 PID—CBR-LC-8D31-16U30 PID—CBR-RF-PIC PID—CBR-RF-PROT-PIC PID—CBR-CCAP-LC-40G PID—CBR-CCAP-LC-40G-R PID—CBR-CCAP-LC-G2-R PID—CBR-SUP-8X10G-PIC PID—CBR-2X100G-PIC Digital PICs: PID—CBR-DPIC-8X10G PID—CBR-DPIC-2X100G Cisco cBR-8 Downstream PHY Module: PID—CBR-D31-DS-MOD Cisco cBR-8 Upstream PHY Modules: PID—CBR-D31-US-MOD

Note

Do not use DPICs (8X10G and 2x100G) to forward IP traffic, as it may cause buffer exhaustion, leading to line card reload.

The only allowed traffic on a DPICs DEPI, UEPI, and GCP traffic from the Cisco cBR-8 router to Remote PHY devices. Other traffic such as DHCP, SSH, and UTSC should flow via another router, since DPICs cannot be used for normal routing.

Information about OFDM Channel Configuration

OFDM Channels

DOCSIS 3.1 introduces modes for higher throughput and higher spectral efficiency while still allowing backward compatibility to DOCSIS 3.0. The OFDM Channel support includes two OFDM channel per port with channel bandwidth from 24 MHz to 192 MHz wide.

From the Cisco IOS XE Gibraltar 16.10.1d release, the Cisco cBR router supports two OFDM channels per service group for an RPD downstream port. You can configure the channels using the cable downstream controller-profile configuration.

Cisco cBR-8 supports 158 SC-QAMs for a single OFDM channel and 128 SC-QAMs for multiple OFDM channels. The max-carrier attribute is automatically set to 158 by default. However, you should set the max-carrier to a value of 128 or below to configure multiple OFDM channels. The Cisco cBR router does not support any value above 128 if you are configuring multiple OFDM channels.

Each OFDM channel supports a control profile, an NCP profile, and up to five data profiles. Profiles support one or more modulations.

You can configure the guard band of an OFDM channel to potentially trade off some performance margin using command guardband-override . By default, Cisco cBR-8 router use the default guard band, which is based on the roll off and spacing in OFDM channel profile.

DOCSIS 3.1 OFDM support also allows the user to configure the RF-channels 158 to 162 under the mac-domain as primary channel.

Channel Profile

A globally configured OFDM channel profile contains channel parameters, and the modulation or modulation profile associated with the control, NCP, and data profiles.

Each OFDM channel must specify an OFDM channel profile in its configuration.

Modulation Profile

A globally configured OFDM modulation profile assigns different modulations to ranges of sub-carriers, or lists of individual sub-carriers.

A modulation profile may be assigned to a control, NCP, or data profile in a channel profile.

OFDM Channel Exclusion Band

Ranges of frequencies can be excluded from all OFDM channels on a port using the ofdm-freq-excl-band command.

How to Configure OFDM Channel

Configuring OFDM Modulation Profile

To configure the OFDM modulation profile, follow the steps below:

enable 
configure terminal 
cable downstream ofdm-modulation-profile id 
description text 
subcarrier-spacing value 
width value 
start-frequency value 
assign {modulation-default mod_prof_id | modulation mod_prof_id {list-subcarriers {freq-abs | freq-offset} value | range-subcarriers {freq-abs | freq-offset} value width value}}

Note

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

Verifying OFDM Modulation Profile Configuration

To display the OFDM modulation profile details, use the show cable ofdm-modulation-profiles command as shown in the example below:

Router# show cable ofdm-modulation-profile 10

**** OFDM Modulation Profile Configuration ****

Prof  FFT  Width     Start-freq Modulations             
ID    KHz  Hz        Hz        
10    50   96000000  627000000  64   default 
                                512  freq-abs  709050000 width   12000000
                                2048 freq-abs  629000000 width    6000000

Profile Subcarrier Modulations
  Modulation: Start-freq-abs[start-sc] - End-freq-abs[end-sc] Width-freq[num-sc]
  64  : 572600000[   0] -  626950000[1087]    54400000[1088]
  64  : 627000000[1088] -  628950000[1127]     2000000[  40]
  2048: 629000000[1128] -  634950000[1247]     6000000[ 120]
  64  : 635000000[1248] -  709000000[2728]    74050000[1481]
  512 : 709050000[2729] -  721000000[2968]    12000000[ 240]
  64  : 721050000[2969] -  722950000[3007]     1950000[  39]
  64  : 723000000[3008] -  777350000[4095]    54400000[1088]

**** OFDM Modulation Profile Assigned Channel Profiles ****

Prof  Channel
ID    Profiles
10    30

To display the associations between OFDM modulation profiles and OFDM channel profiles, use the show cable ofdm-modulation-profile command with channel-profiles option as shown in the example below:

Router# show cable ofdm-modulation-profile channel-profiles

**** OFDM Modulation Profile Assigned Channel Profiles ****

Prof  Channel
ID    Profiles
8     None
9     28
10    30
192   192

To display the OFDM modulation profile configurations, use the show cable ofdm-modulation-profile command with configuration option as shown in the example below:

Router# show cable ofdm-modulation-profile configuration

**** OFDM Modulation Profile Configuration ****

Prof  FFT  Width     Start-freq Modulations              Description
ID    KHz  Hz        Hz                                  (Limited to 20)
8     50   192000000 NA         2048 default 
                                512  freq-off   48000000
                                     width      24000000
9     50   96000000  627000000  512  default             512-1k-4k           
                                1024 freq-abs  635000000
                                     width      74050000
                                4096 freq-abs  629000000
                                     width       6000000
10    50   96000000  627000000  64   default 
                                512  freq-abs  709050000
                                     width      12000000
                                2048 freq-abs  629000000
                                     width       6000000

Configuring OFDM Channel Profile

To configure the OFDM channel profile, follow the steps below:

enable 
configure terminal 
cable downstream ofdm-chan-profile id 
description text 
cyclic-prefix value 
interleaver-depth value 
pilot-scaling value 
roll-off value 
subcarrier-spacing value 
profile-ncp modulation-default mod_prof_id 
profile-control {modulation-default mod_prof_id | modulation-profile mod_prof_id} 
profile-data channel_data_prof_id {modulation-default mod_prof_id | modulation-profile mod_prof_id}

Verifying OFDM Channel Profile Configuration

To display the OFDM channel profile details, use the show cable ofdm-chan-profiles command as shown in the example below:

Router# show cable ofdm-chan-profile 20

**** OFDM Channel Profile Configuration ****

Prof  Cycl  Roll  FFT  Intr   Pilot  Modulation (D-Default, P-Profile)                    
ID    Prfx  Off   KHz  Depth  Scale  Cntrl   NCP     Data Profiles                         
                                                     1       2       3       4       5      
20    1024  128   50   16     48     D:1024  D:16    NA      NA      NA      NA      NA
**** OFDM Channel Profile Assigned Channels ****

Prof  Admin  Controller:channels
ID  
20    Up     3/0/1:158              3/0/2:158              3/0/3:158              3/0/5:158            
             3/0/6:158              3/0/7:158

To display the associations between OFDM channel profiles and OFDM channels, use the show cable ofdm-chan-profiles command with channels option as shown in the example below:

Router# show cable ofdm-chan-profile channels

**** OFDM Channel Profile Assigned Channels ****

Prof  Admin  Controller:channels
ID  
20    Up     3/0/1:158              3/0/2:158              3/0/3:158              3/0/5:158            
             3/0/6:158              3/0/7:158            
30    Up     3/0/4:158            
101   Up     3/0/0:158

To display the OFDM channel profile configurations, use the show cable ofdm-chan-profiles command with configuration option as shown in the example below:

Router# show cable ofdm-chan-profile configuration

**** OFDM Channel Profile Configuration ****

Prof  Cycl  Roll  FFT  Intr   Pilot  Modulation (D-Default, P-Profile)                      Description
ID    Prfx  Off   KHz  Depth  Scale  Cntrl   NCP     Data Profiles                          (Limited to 20)
                                                     1       2       3       4       5      
0     192   128   50   16     48     D:256   D:16    D:1024  NA      NA      NA      NA     System Profile 0    
1     192   128   50   16     48     D:256   D:16    D:1024  D:2048  D:512   NA      NA     System Profile 1    
20    1024  128   50   16     48     D:1024  D:16    NA      NA      NA      NA     NA    
30    1024  128   50   16     48     P:10    D:16    NA      NA      NA      NA      NA

Configuring OFDM Channel as Primary Channel

To configure an RF-channel in the mac-domain as an OFDM primary channel, use the following commands.

enable
configure terminal
interface cable <slot/subslot/port> downstream Integrated-Cable <slot/subslot/port> 
rf-channel <ofdm-channel-number: 158-162>
end

Verifying OFDM Primary Channel Configuration

To display the OFDM channel configuration details, where the OFDM channel is the primary channel, use the command as shown in the following example:

Router#sh run int c3/0/3
Building configuration...

Current configuration : 539 bytes
!
interface Cable3/0/3
 load-interval 30
 downstream Integrated-Cable 3/0/3 rf-channel 0
 downstream Integrated-Cable 3/0/3 rf-channel 158
 upstream 0 Upstream-Cable 3/0/6 us-channel 0
 upstream 1 Upstream-Cable 3/0/6 us-channel 1
 upstream 2 Upstream-Cable 3/0/6 us-channel 2
 upstream 3 Upstream-Cable 3/0/6 us-channel 3
 cable upstream bonding-group 1
  upstream 0
  upstream 1
  upstream 2
  upstream 3
  attributes 80000000
 cable bundle 1
 cable cm-status enable 3 6-11 16-18 20-27
 cable privacy accept-self-signed-certificate
end

You can also use the following command to display the OFDM primary channel configuration details as shown in this example.

Router#sh cable mac-domain c3/0/3 cgd-associations 
CGD Host  Resource  DS Channels            Upstreams    (ALLUS)   Active DS
Ca3/0/3   3/0/3     0                      0-3          Yes        0
                    158                    0-3          Yes        158

The show cable mac-domain Cable <slot>/<subslot>/<port> mdd command also displays the OFDM primary channel configuration details as shown in the example.

...
Downstream Active Channel List
        Channel ID:             159 
        Frequency:              836000000Hz
        Primary Capable:        Primary-Capable
        CM-STATUS Event Bitmask:0x36
                                MDD Timeout
                                QAM FEC failure
                                MDD Recovery
                                QAM FEC recovery
        MAP/UCD Transport Indicator:  Can carry MAPs and UCDs
        OFDM PLC Params Bitmask:  
               Tukey raised cosine window: 0.625
               Cyclic Prefix: 5.0
               Sub carrier spacing: 50

RF channels use a zero-based numbering scheme, whereas the downstream channel IDs are numbered starting from one. Thus RF channel 158 is equivalent to channel ID 159. The Channel ID in this example is 159. The MAP/UCD Transport Indicator shows that MAPs and UCDs are sent only on Primary Channels.

Configuring Port or Controller and Channel

To configure the port/controller and channel, use the following commands:

enable 
configure terminal 
controller integrated-cable slot/subslot/port 
max-ofdm-spectrum value 
ofdm-freq-excl-band start-frequency value width value 
rf-chan start_id [end_id] 
ofdm channel-profile id start-frequency value width value [plc value]

Note

The range of start_id is 158 to 162 in the OFDM channel configuration.

The maximum OFDM spectrum is assigned to OFDM channels, which is used by the the CMTS to calculate default port base power.

Ranges of frequencies can be excluded from all OFDM channels using the ofdm-freq-excl-band command.

Verifying Port/Controller and Channel Configuration

To display the RF port details, use the show controller integrated-cable command with rf-port option as shown in the example below:

Router# show controller integrated-cable 3/0/0 rf-port

Admin:  UP  MaxCarrier: 128  BasePower: 33 dBmV  Mode: normal
  Rf Module 0: UP
  Free freq block list has 3 blocks:
    45000000  - 107999999
    624000000 - 644999999
    837000000 - 1217999999
  Rf Port Status: UP
  MaxOfdmSpectrum:  192000000   Equivalent 6MHz channels: 32        
  UsedOfdmSpectrum: 192000000   AvailOfdmSpectrum:        0         
  DefaultBasePower: 33 dBmV     Equivalent 6MHz channels: 160       
  OFDM frequency exclusion bands: None

To display the summary information on OFDM channel, use the show controller integrated-cable command with rf-channel option as shown in the example below:

Router# show controller integrated-cable 3/0/0 rf-channel 158

Chan State Admin Mod-Type  Start       Width     PLC        Profile-ID    dcid  power  output
                           Frequency                                      
 158   UP   UP   OFDM      627000000   96000000  663000000       20       159   34     NORMAL

To display detailed information on OFDM channel, use the show controller integrated-cable command with rf-channel and verbose options as shown in the example below:

Router# show controller integrated-cable 3/0/0 rf-channel 158 verbose

Chan State Admin Mod-Type  Start       Width     PLC        Profile-ID    dcid  power  output
                           Frequency                                      
 158   UP   UP   OFDM      627000000   96000000  663000000       30       159   32     NORMAL
 Resource status:   OK
 License: granted <17:02:35 EDT May 18 2016>
 OFDM channel license spectrum width: 92200000
 OFDM modulation license (spectrum width): 2K (6000000)
 OFDM config state: Configured

 OFDM channel details: [3/0/4:158]
------------------------------------------
 OFDM channel frequency/subcarrier range     : 627000000[1088] - 722999999[3007]
 OFDM spectrum frequency/subcarrier range    : 572600000[   0] - 777399999[4095]
 Active spectrum frequency/subcarrier range  : 628900000[1126] - 721049999[2969]
 OFDM channel center frequency/subcarrier    : 675000000[2048]
 PLC spectrum start frequency/subcarrier     : 663000000[1808]
 PLC frequency/subcarrier                    : 665800000[1864]
 Channel width                               : 96000000
 Active Channel width                        : 92200000
 OFDM Spectrum width                         : 204800000
 Chan prof id                                : 30
 Cyclic Prefix                               : 1024
 Roll off                                    : 128
 Interleave depth                            : 16
 Spacing                                     : 50KHZ
 Pilot Scaling                               : 48
 Control modulation profile                  : 10
 NCP modulation default                      : 16
 Data modulation default                     : None
 Data modulation profile                     : None
 Lower guardband width in freq/subcarriers   : 1900000[38]
 Upper guardband width in freq/subcarriers   : 1900000[38]
 Licensed 4K modulation spectrum width       : 0
 Licensed 2K modulation spectrum width       : 6000000
 
 PLC spectrum frequencies [subcarriers]              :
  663000000[1808] - 668999999[1927]   
          
 PLC channel frequencies [subcarriers]                 :
  665800000[1864] - 666199999[1871]   Size: 8 subcarriers
          
 Excluded frequencies [subcarriers]                :
  572600000[   0] - 628899999[1125]     721100000[2970] - 777399999[4095]   
  Count: 2252
          
 Pilot frequencies [subcarriers]                   :
  *:PLC pilots
  630700000[1162]   634300000[1234]   637900000[1306]   641500000[1378] 
  645100000[1450]   648700000[1522]   652300000[1594]   655900000[1666] 
  659500000[1738]   663450000[1817]*  664050000[1829]*  664600000[1840]*
  665050000[1849]*  666900000[1886]*  667350000[1895]*  667900000[1906]*
  668500000[1918]*  669100000[1930]   672700000[2002]   676300000[2074] 
  679900000[2146]   683500000[2218]   687100000[2290]   690700000[2362] 
  694300000[2434]   697900000[2506]   701500000[2578]   705100000[2650] 
  708700000[2722]   712300000[2794]   715900000[2866]   719500000[2938] 
  Count: 32

 Active frequencies [subcarriers]                  :
  628900000[1126] - 721099999[2969]   
  Count: 1844
          
 Data frequencies [subcarriers]                   :
  628900000[1126] - 630699999[1161]     630750000[1163] - 634299999[1233]   
  634350000[1235] - 637899999[1305]     637950000[1307] - 641499999[1377]   
  641550000[1379] - 645099999[1449]     645150000[1451] - 648699999[1521]   
  648750000[1523] - 652299999[1593]     652350000[1595] - 655899999[1665]   
  655950000[1667] - 659499999[1737]     659550000[1739] - 663449999[1816]   
  663500000[1818] - 664049999[1828]     664100000[1830] - 664599999[1839]   
  664650000[1841] - 665049999[1848]     665100000[1850] - 665799999[1863]   
  666200000[1872] - 666899999[1885]     666950000[1887] - 667349999[1894]   
  667400000[1896] - 667899999[1905]     667950000[1907] - 668499999[1917]   
  668550000[1919] - 669099999[1929]     669150000[1931] - 672699999[2001]   
  672750000[2003] - 676299999[2073]     676350000[2075] - 679899999[2145]   
  679950000[2147] - 683499999[2217]     683550000[2219] - 687099999[2289]   
  687150000[2291] - 690699999[2361]     690750000[2363] - 694299999[2433]   
  694350000[2435] - 697899999[2505]     697950000[2507] - 701499999[2577]   
  701550000[2579] - 705099999[2649]     705150000[2651] - 708699999[2721]   
  708750000[2723] - 712299999[2793]     712350000[2795] - 715899999[2865]   
  715950000[2867] - 719499999[2937]     719550000[2939] - 721099999[2969]   
  Count: 1804

 Profiles:
  Number of profiles: 2
  CTRL profile (Profile A): rate: 461916 kbps, usable rate: 368000 kbps
  Active frequencies [subcarriers]:
  Modulation:Start-freq[start-subcarrier] - End-freq[end-subcarrier]
  ------------------------------------------------------------------
  64   :628900000[1126] - 628950000[1127]     2048 :629000000[1128] - 630650000[1161]   
  2048 :630750000[1163] - 634250000[1233]     2048 :634350000[1235] - 634950000[1247]   
  64   :635000000[1248] - 637850000[1305]     64   :637950000[1307] - 641450000[1377]   
  64   :641550000[1379] - 645050000[1449]     64   :645150000[1451] - 648650000[1521]   
  64   :648750000[1523] - 652250000[1593]     64   :652350000[1595] - 655850000[1665]   
  64   :655950000[1667] - 659450000[1737]     64   :659550000[1739] - 663400000[1816]   
  64   :663500000[1818] - 664000000[1828]     64   :664100000[1830] - 664550000[1839]   
  64   :664650000[1841] - 665000000[1848]     64   :665100000[1850] - 665750000[1863]   
  64   :666200000[1872] - 666850000[1885]     64   :666950000[1887] - 667300000[1894]   
  64   :667400000[1896] - 667850000[1905]     64   :667950000[1907] - 668450000[1917]   
  64   :668550000[1919] - 669050000[1929]     64   :669150000[1931] - 672650000[2001]   
  64   :672750000[2003] - 676250000[2073]     64   :676350000[2075] - 679850000[2145]   
  64   :679950000[2147] - 683450000[2217]     64   :683550000[2219] - 687050000[2289]   
  64   :687150000[2291] - 690650000[2361]     64   :690750000[2363] - 694250000[2433]   
  64   :694350000[2435] - 697850000[2505]     64   :697950000[2507] - 701450000[2577]   
  64   :701550000[2579] - 705050000[2649]     64   :705150000[2651] - 708650000[2721]   
  64   :708750000[2723] - 709000000[2728]     512  :709050000[2729] - 712250000[2793]   
  512  :712350000[2795] - 715850000[2865]     512  :715950000[2867] - 719450000[2937]   
  512  :719550000[2939] - 721000000[2968]     64   :721050000[2969] - 721050000[2969]   
  Active subcarrier count: 1804, ZBL count: 0
  Discontinuity time [days:hours:mins:secs]: 00:00:54:32 [16:15:02 EDT May 18 2016]
          
  NCP profile:
  Active frequencies [subcarriers]:
  Modulation:Start-freq[start-subcarrier] - End-freq[end-subcarrier]
  ------------------------------------------------------------------
  16   :628900000[1126] - 630650000[1161]     16   :630750000[1163] - 634250000[1233]   
  16   :634350000[1235] - 637850000[1305]     16   :637950000[1307] - 641450000[1377]   
  16   :641550000[1379] - 645050000[1449]     16   :645150000[1451] - 648650000[1521]   
  16   :648750000[1523] - 652250000[1593]     16   :652350000[1595] - 655850000[1665]   
  16   :655950000[1667] - 659450000[1737]     16   :659550000[1739] - 663400000[1816]   
  16   :663500000[1818] - 664000000[1828]     16   :664100000[1830] - 664550000[1839]   
  16   :664650000[1841] - 665000000[1848]     16   :665100000[1850] - 665750000[1863]   
  16   :666200000[1872] - 666850000[1885]     16   :666950000[1887] - 667300000[1894]   
  16   :667400000[1896] - 667850000[1905]     16   :667950000[1907] - 668450000[1917]   
  16   :668550000[1919] - 669050000[1929]     16   :669150000[1931] - 672650000[2001]   
  16   :672750000[2003] - 676250000[2073]     16   :676350000[2075] - 679850000[2145]   
  16   :679950000[2147] - 683450000[2217]     16   :683550000[2219] - 687050000[2289]   
  16   :687150000[2291] - 690650000[2361]     16   :690750000[2363] - 694250000[2433]   
  16   :694350000[2435] - 697850000[2505]     16   :697950000[2507] - 701450000[2577]   
  16   :701550000[2579] - 705050000[2649]     16   :705150000[2651] - 708650000[2721]   
  16   :708750000[2723] - 712250000[2793]     16   :712350000[2795] - 715850000[2865]   
  16   :715950000[2867] - 719450000[2937]     16   :719550000[2939] - 721050000[2969]   
  Active subcarrier count: 1804, ZBL count: 0
          
 CCCs:
   OCD CCC: 2
   DPD CCCs:
     Control profile  (Profile A) CCC: 2
         NCP profile  CCC: 2
 Resource config time taken: 2286 msecs
 
 
JIB channel number: 776
Chan Pr EnqQ  Pipe  RAF   SyncTmr DqQ ChEn   RAF Pipe Phy0 Phy1 Tun# SessId 0[TkbRt MaxP]     1[TkbRt MaxP]
 776  0   384     1   725       0 384 0100 13032    1    0    1    2      0 479610000 4485120 383688000 4485120
 776  1   384     1  4786       0 384 0100  2190    1    0    1    2      0 479610000 4485120 383688000 4485120
 776  2   384     1  4786       0 384 0100  2190    1    0    1    2      0 479610000 4485120 383688000 4485120
 776  3   384     1  4786       0 384 0100  2190    1    0    1    2      0 479610000 4485120 383688000 4485120
 776  4   384     1  4786       0 384 0100  2190    1    0    1    2      0 479610000 4485120 383688000 4485120
 776  5   384     1  4786       0 384 0100  2190    1    0    1    2      0 479610000 4485120 383688000 4485120
 776  6   384     1  4786       0 384 0100  2190    1    0    1    2      0 479610000 4485120 383688000 4485120
 776  7   384     1     0       0 384 0100     0    1    0    1    2      0 479610000 4485120 383688000 4485120

Chan   Qos-Hi   Qos-Lo    Med-Hi   Med-Lo    Low-Hi   Low-Lo
 776   368640   245760    368640   245760    614400   368640
Chan  Med Low TB-neg Qos_Exc  Med_Xof  Low_Xof  Qdrops(H-M-L)  Pos    Qlen(Hi-Med-lo) Fl Tgl_cnt Rdy_sts
  776   0   0      0       0        0        0    0    0    0  Y      0      0      0  0        0 ff
Chan       Rate   Neg   Pos    LastTS  CurrCr  Pos  [PLC Rate Neg Pos]
 776   10485750 65535 65535 116199669 268431360   Y [MM 86 128 1114][EM 87 128 6204][TR 2 9 3102]
DSPHY Info:
 Local rf port 0 , rf chan 158 pic loss 123
 non short CWs: = 235681130, shorts = 0, stuff bytes = 235639172 bch 235681130
 NCP msgs: = 453809753, PLC encodings = 16902476
 flow0 rcv 70203 flow1 rcv 3 flow0 drops 0 flow1 drops 0

Configuration Examples

This section provides examples for configuring the OFDM channel.

Example1: Configuring OFDM Channel

Note

The OFDM modulation profile must be configured before the OFDM channel profile which references it.

The following example shows how to configure the OFDM channel:

enable 
configure terminal 
cable downstream ofdm-modulation-profile 9 
description 512-1k-4k 
subcarrier-spacing 50KHz 
width 96000000 
start-frequency 627000000 
assign modulation-default 512-QAM 
assign modulation 1024-QAM range-subcarriers freq-abs 635000000 width 74050000 
assign modulation 4096-QAM range-subcarriers freq-abs 629000000 width 6000000 
exit 
configure terminal 
cable downstream ofdm-chan-profile 20 
description Data profiles: 2 single mod, 1 mixed mod 
cyclic-prefix 192 
interleaver-depth 16 
pilot-scaling 48 
roll-off 128 
subcarrier-spacing 50KHz 
profile-ncp modulation-default 16-QAM 
profile-control modulation-default 256-QAM 
profile-data 1 modulation-default 1024-QAM 
profile-data 2 modulation-default 2048-QAM 
profile-data 3 modulation-profile 9 
exit 
configure terminal 
controller integrated-cable 3/0/0 
max-ofdm-spectrum 96000000 
ofdm-freq-excl-band start-frequency 683000000 width 10000000 
rf-chan 158 
power-adjust 0 
docsis-channel-id 159 
ofdm channel-profile 20 start-frequency 627000000 width 96000000 plc 663000000

Example 2: Configuring OFDM Primary Channel in the MAC Domain

enable 
configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
interface cable 3/0/0 
downstream Integrated-Cable 3/0/3 rf-channel 158  
end

Additional References

Document Title	Link
Cisco cBR Converged Broadband Routers Layer 2 and DOCSIS 3.0 Configuration Guide	http://www.cisco.com/c/en/us/td/docs/cable/cbr/configuration/guide/b_cbr_layer2_docsis30.html

MIBs


MIBs	MIBs Link
DOCS-IF31-MIB	To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs

Technical Assistance


Description	Link
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.	http://www.cisco.com/support

Feature Information for DOCSIS 3.1 OFDM 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 2. Feature Information for DOCSIS 3.1 OFDM Channel Configuration
Feature Name	Releases	Feature Information
DOCSIS 3.1 OFDM Channel Support	Cisco IOS XE Fuji 16.7.1	This feature was integrated on the Cisco cBR Series Converged Broadband Routers.
Full Spectrum 108-1218 MHz Support	Cisco IOS XE Fuji 16.7.1	This feature was integrated on the Cisco cBR Series Converged Broadband Routers.
DOCSIS 3.1 OFDM Primary Channel Support	Cisco IOS XE Fuji 16.7.1	This feature was integrated on the Cisco cBR Series Converged Broadband Routers.
Enhanced support for subcarrier spacing, exclusion band, and LCPR	Cisco IOS XE Fuji 16.7.1	This feature was integrated on the Cisco cBR Series Converged Broadband Routers.
Hitless OFDM Profile Changes	Cisco IOS XE Everest 16.12.1x	This feature was integrated on the Cisco cBR Series Converged Broadband Routers.
Ephemeral Profile to Cable Modem Assignment	Cisco IOS XE Everest 16.12.1x	This feature was integrated on the Cisco cBR Series Converged Broadband Routers.
Profile Management Application Scaling	Cisco IOS XE Everest 16.12.1z	This feature was integrated on the Cisco cBR Series Converged Broadband Routers.

Cisco cBR Converged Broadband Routers DOCSIS Software Configuration Guide for Cisco IOS XE Bengaluru 17.6.x

Bias-Free Language

Book Title

Cisco cBR Converged Broadband Routers DOCSIS Software Configuration Guide for Cisco IOS XE Bengaluru 17.6.x

Chapter Title