DOCSIS 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers

First Published: February 14, 2008

Last Updated: July 11, 2012


Note

Cisco IOS Release 12.2(33)SCA integrates support for this feature on the Cisco CMTS routers. This feature is also supported in Cisco IOS Release 12.3BC, and this document contains information that references many legacy documents related to Cisco IOS 12.3BC. In general, any references to Cisco IOS Release 12.3BC also apply to Cisco IOS Release 12.2SC.

This document describes the DOCSIS 2.0 A-TDMA services feature, which provides support for DOCSIS 2.0 Advanced Time Division Multiple Access (A-TDMA) upstream modulation profiles on the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U Broadband Processing Engine (BPE) cable interface line cards. This feature supplements the existing support for DOCSIS 1.0 and DOCSIS 1.1 Time Division Multiple Access (TDMA) modulation profiles.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

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.

Contents

Prerequisites for DOCSIS 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers

The table below shows the hardware compatibility prerequisites for this feature.

Table 1 DOCSIS 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers Hardware Compatibility Matrix

CMTS Platform

Processor Engine

Cable Interface Cards

Cisco uBR10012 Universal Broadband Router

Cisco IOS Release 12.2(15)BC 2and later releases

  • PRE-1
  • PRE-2

Cisco IOS Release 12.2(33)SCA

  • PRE-2

Cisco IOS Release 12.2(33)SCH and later releases

  • PRE5

Cisco IOS Release 12.3(15)BC2 and later releases

  • Cisco uBR10-MC5X20S/U/H

Cisco IOS Release 12.2(33)SCA

  • Cisco uBR10-MC5X20S/U/H

Cisco uBR7246VXR Universal Broadband Router

Cisco IOS Release 12.2(15)CX and 12.2(15)BC2 and later releases

  • NPE-G1

Cisco IOS Release 12.2(33)SCA

  • NPE-G1
  • NPE-G2

Cisco IOS Release 12.2(15)CX and 12.2(15)BC2 and later releases

  • Cisco uBR-MC28U/X
  • Cisco uBR-MC16U/X

Cisco IOS Release 12.2(33)SCA

  • Cisco uBR-MC28U/X
  • Cisco uBR-MC16U/X

Cisco uBR7225VXR Universal Broadband Router

Cisco IOS Release 12.2(33)SCA

  • NPE-G1

Cisco IOS Release 12.2(33)SCA

  • Cisco uBR-E-28U
  • Cisco uBR-E-16U
  • Cisco uBR-MC28U/X
  • Cisco uBR-MC16U/X
  • The cable physical plant must be capable of supporting the higher-bandwidth DOCSIS 2.0 A-TDMA modulation profiles.
  • Cable modems must be DOCSIS-compliant. If cable modems go offline, or appear to be online but do not pass traffic when in the mixed TDMA/A-TDMA mode, upgrade the modem software to a DOCSIS-compliant version.

  • The following are required to support the DOCSIS 2.0 A-TDMA features:

    • Cable modems must be DOCSIS 2.0 capable.
    • The DOCSIS configuration file for a DOCSIS 2.0 cable modem must either omit the DOCSIS 2.0 Enable field (TLV 39), or it must set TLV 39 to 1 (enable). If you set TLV 39 to 0 (disable), a DOCSIS 2.0 CM uses the TDMA mode.
    • The upstream must be configured for either A-TDMA-only or mixed TDMA/A-TDMA mode. To use the 6.4 MHz channel width, the upstream must be configured for A-TDMA-only mode.

  • Complete a basic configuration of the Cisco uBR7246VXR or Cisco uBR10012 router; this includes, at a minimum, the following tasks:

    • Configure a host name and password for the router.
    • Configure the router to support Internet Protocol (IP) operations.
    • Install and configure at least one WAN adapter to provide backbone connectivity.
  • Determine a channel plan for your Cisco uBR7246VXR or Cisco uBR10012 router and all of its cable interfaces.
  • Verify that your headend site includes all necessary servers to support DOCSIS and Internet connectivity, including DHCP, ToD, and TFTP servers.
  • The system clock on the Cisco uBR7246VXR or Cisco uBR10012 router should be set to a current date and time to ensure that system logs have the proper timestamp and to ensure that the BPI+ subsystem uses the correct timestamp for verifying cable modem digital certificates.

Restrictions for DOCSIS 2.0 A-TDMA Services

  • Does not support virtual channels, as described in DOCSIS 2.0 specification.
  • Does not support Synchronous Code Division Multiple Access (S-CDMA) channels.
  • Cisco IOS Release 12.2(15)CX, Release 12.2(15)BC2, and later releases support a maximum of 10 modulation profiles for each of the three DOCSIS modes (DOCSIS 1.x TDMA, mixed, and DOCSIS 2.0 A-TDMA), for a total maximum of 30 modulation profiles.
  • Advanced hardware-based spectrum management is not supported for DOCSIS 2.0 mixed-mode and A-TDMA upstreams. Advanced spectrum management features (such as guided frequency hopping, dynamic upstream modulation, and proactive CNR-based frequency hopping and channel width changes) can be configured only on DOCSIS and EuroDOCSIS 1.X upstreams. You cannot use these features on channels configured for mixed mode or DOCSIS 2.0 A-TDMA mode. Advanced hardware-based spectrum management for A-TDMA operations is scheduled to be supported in a future release of the Cisco IOS software.
  • Changing the DOCSIS mode of an upstream takes all cable modems on that upstream offline, which forces the cable modems to reregister, so that the CMTS can determine the capabilities of the cable modems on the new channels.

Information About DOCSIS 2.0 A-TDMA Services

DOCSIS 2.0 A-TDMA services improve the maximum upstream bandwidth on existing DOCSIS 1.0 and DOCSIS 1.1 cable networks by providing a number of advanced PHY capabilities that have been specified by the new DOCSIS 2.0 specifications.

In Cisco IOS Release 12.2(15)BC2, DOCSIS 2.0 A-TDMA services are supported on the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U Broadband Processing Engine (BPE) cable interface line cards.

DOCSIS 2.0 A-TDMA services incorporate the following advantages and improvements of DOCSIS 2.0 networks:

  • Builds on existing DOCSIS cable networks by providing full compatibility with existing DOCSIS 1.0 and DOCSIS 1.1 cable modems. (The registration response (REG-RSP) message contains the DOCSIS version number to identify each cable modem’s capabilities.)
  • Upstreams can be configured for three different modes to support different mixes of cable modems:
    • An upstream can be configured for TDMA mode to support only DOCSIS 1.0 and DOCSIS 1.1 cable modems.
    • An upstream can be configured for A-TDMA mode to support only DOCSIS 2.0 cable modems.
    • An upstream can be configured for a mixed, TDMA/A-TDMA mode, to support both DOCSIS 1.0/DOCSIS 1.1 and DOCSIS 2.0 cable modems on the same upstream.

    Note

    DOCSIS 2.0 A-TDMA cable modems will not register on a TDMA upstream if an A-TDMA or mixed upstream exists in the same MAC domain, unless the CMTS explicitly switches the cable modem to another upstream using an Upstream Channel Change (UCC) message. DOCSIS 1.0 and DOCSIS 1.1 cable modems cannot register on an A-TDMA-only upstream.

  • A-TDMA mode defines new interval usage codes (IUC) of A-TDMA short data grants, long data grants, and Unsolicited Grant Service (UGS) grants (IUC 9, 10, and 11) to supplement the existing DOCSIS 1.1 IUC types.
  • Increases the maximum channel capacity for A-TDMA upstreams to 30 Mbps per 6 MHz channel.
  • A-TDMA and mixed modes of operation provide higher bandwidth on the upstream using new 32-QAM and 64-QAM modulation profiles, while retaining support for existing 16-QAM and QPSK modulation profiles. In addition, an 8-QAM modulation profile is supported for special applications.
  • Supports a minislot size of 1 tick for A-TDMA operations.
  • Increases channel widths to 6.4 MHz (5.12 Msymbol rate) for A-TDMA operations.
  • A-TDMA and mixed modes of operation provide a more robust operating environment with increased protection against ingress noise and other signal impairments, using a number of new features:
    • Uses to a symbol (T)-spaced adaptive equalizer structure to increase the equalizer tap size to 24 taps, compared to 8 taps in DOCSIS 1.x mode. This allows operation in the presence of more severe multipath and microreflections, and can accommodate operation near band edges where group delay could be a problem.
    • Supports new QPSK0 and QPSK1 preambles, which provide improved burst acquisition by performing simultaneous acquisition of carrier and timing lock, power estimates, equalizer training, and constellation phase lock. This allows shorter preambles, reducing implementation loss.
    • Increases the forward error correction (FEC) T-byte size to 16 bytes per Reed Solomon block (T=16) with programmable interleaving.

Note

Cisco IOS Release 12.2(15)BC2 does not support the Synchronous Code Division Multiple Access (S-CDMA) modulation technique that is also specified in the DOCSIS 2.0 specification.

Modes of Operation

Depending on the configuration, the DOCSIS 2.0 A-TDMA Service feature supports either DOCSIS or Euro-DOCSIS operation:

  • DOCSIS cable networks are based on the ITU J.83 Annex B physical layer standard and Data-over-Cable Service Interface Specifications (DOCSIS, Annex B) specification, which use 6 MHz National Television Systems Committee (NTSC) channel plans. In this mode, the downstream uses a 6 MHz channel width in the 85 to 860 MHz frequency range, and the upstream supports multiple channel widths in the 5 to 42 MHz frequency range.

    Cisco IOS Release 12.2(15)BC2 also supports an extended frequency range for DOCSIS cable networks, in which the upstream channel widths can range from 5 to 55 MHz.

  • EuroDOCSIS cable networks are based on the ITU J.112 Annex A physical layer standard and European DOCSIS (EuroDOCSIS, Annex A) specification, which use 8 MHz Phase Alternating Line (PAL) and Systeme Electronique Couleur Avec Memoire (SECAM) channel plans. In this mode, the downstream uses an 8 MHz channel width in the 85 to 860 MHz frequency range, and the upstream supports multiple channel widths in the 5 to 65 MHz frequency range.


Note

The difference between DOCSIS and EuroDOCSIS is at the physical layer. To support a DOCSIS or EuroDOCSIS network requires the correct configuration of the DOCSIS 2.0 A-TDMA Service card, as well as upconverters, diplex filters, and other equipment that supports the network type.

When using Cisco IOS Release 12.2(15)BC2, the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U cards support all DOCSIS 1.1-specified and all DOCSIS 2.0-specified A-TDMA radio frequency (RF) data rates, channel widths, and modulation schemes.

The table below shows the maximum supported DOCSIS 1.1 data rates.

Table 2 Maximum DOCSIS 1.1 Data Rates

Upstream Channel Width

Modulation Scheme

Baud Rate Sym/sec

Maximum Raw Bit Rate Mbit/sec

3.2 MHz

16-QAM QPSK

2.56 M

10.24 5.12

1.6 MHz

16-QAM QPSK

1.28 M

5.12 2.56

800 kHz

16-QAM QPSK

640 K

2.56 1.28

400 kHz

16-QAM QPSK

320 K

1.28 0.64

200 kHz

16-QAM QPSK

160 K

0.64 0.32

The table below shows the maximum supported DOCSIS 2.0 (A-TDMA-mode) data rates.

Table 3 Maximum DOCSIS 2.0 (A-TDMA-mode) Data Rates

Upstream Channel Width

Modulation Scheme

Baud Rate Sym/sec

Maximum Raw Bit Rate Mbit/sec

6.4 MHz

64-QAM

32-QAM

16-QAM

8-QAM

QPSK

5.12 M

30.72

25.60

20.48

15.36

10.24

3.2 MHz

64-QAM

32-QAM

16-QAM

8-QAM

QPSK

2.56 M

15.36

12.80

10.24

7.68

5.12

1.6 MHz

64-QAM

32-QAM

16-QAM

8-QAM

QPSK

1.28 M

7.68

6.40

5.12

3.84

2.56

800 kHz

64-QAM

32-QAM

16-QAM

8-QAM

QPSK

640 K

3.84

3.20

2.56

1.92

1.28

400 kHz

64-QAM

32-QAM

16-QAM

8-QAM

QPSK

320 K

1.92

1.60

1.28

0.96

0.64

200 kHz

64-QAM

32-QAM

16-QAM

8-QAM

QPSK

160 K

0.96

0.80

0.64

0.48

0.32

Modulation Profiles

To simplify the administration of A-TDMA and mixed TDMA/A-TDMA modulation profiles, the DOCSIS 2.0 A-TDMA Service feature provides a number of preconfigured modulation profiles that are optimized for different modulation schemes. We recommend using these preconfigured profiles.

Each mode of operation also defines a default modulation profile that is automatically used when a profile is not specifically assigned to an upstream. These default modulation profiles (1, 21, 41, 101, 121, 141, 201, 221, and 241, depending on the cable interface line cards that are installed) cannot be deleted. The valid range for modulation profiles depends on the cable interface being used and the type of modulation profile being created. The table below lists the valid ranges according to cable interface and modulation type:

Table 4 Allowable Ranges for Modulation Profiles

Cable Interface

DOCSIS 1.X (TDMA)

Mixed DOCSIS 1.X/2.0

DOCSIS 2.0 (A-TDMA)

Cisco uBR7100 series

1 to 10 (default is 1)

N/A

N/A

Cisco uBR-MC16C

1 to 10 (default is 1)

N/A

N/A

Cisco uBR-MC16S

1 to 10 (default is 1)

N/A

N/A

Cisco uBR-MC28C

1 to 10 (default is 1)

N/A

N/A

Cisco uBR-MC5X20S/U

21 to 30 (default is 21)

121 to 130 (default is 121)

221 to 230 (default is 221)

Cisco uBR-MC16U/X, Cisco uBR-MC28U/X

41 to 50 (default is 41)

141 to 150 (default is 141)

241 to 250 (default is 241)

Benefits

The DOCSIS 2.0 A-TDMA Service feature provides the following benefits to cable service providers and their partners and customers:

  • Full compatibility with DOCSIS 1.0 and DOCSIS 1.1 cable modems (CMs) and cable modem termination systems (CMTS).
  • Additional channel capacity in the form of more digital bits of throughput capacity in the upstream path.
  • Increased protection against electronic impairments that occur in cable systems, allowing for a more robust operating environment.

How to Configure DOCSIS 2.0 A-TDMA Services

This section contains the following:

Creating Modulation Profiles

This section describes how to create modulation profiles for the different modes of DOCSIS operations, using the preconfigured modulation profile options.

Creating a TDMA Modulation Profile

This section describes how to create a modulation profile for the DOCSIS 1.0/DOCSIS 1.1 TDMA mode of operation, using one of the preconfigured modulation profiles.

     Command or ActionPurpose
    Step 1enable


    Example: 
    Router> enable
     

    Enables privileged EXEC mode. Enter your password if prompted.

     
    Step 2configure terminal


    Example: 
    Router# configure terminal
     

    Enters global configuration mode.

     
    Step 3cable modulation-profile profile {mix | qam-16 | qpsk | robust-mix}


    Example: 
    Router(config)# cable modulation-profile 3 mix 
Router(config)# cable modulation-profile 4 qpsk
     

    Creates a preconfigured modulation profile, where the burst parameters are set to their default values for each burst type:

    • profile— Specifies the modulation profile number. The valid range depends on the cable interface line card:

      • For the Cisco uBR-MC5X20S/U card, the valid range is 21 to 30. The system creates profile 21 as a default TDMA-only modulation profile.
      • For the Cisco uBR-MC16U/X and Cisco uBR-MC28U/X card, the valid range is 41 to 50. The system creates profile 41 as a default TDMA-only modulation profile.
      • For all other cable interface line cards, the valid range is 1 to 10. The system creates profile 1 as a default TDMA-only modulation profile.

    • The following preconfigured profiles are available:

      • mix— Default QPSK/16-QAM profile.
      • qam-16— Default 16-QAM profile.
      • qpsk— Default QPSK profile.
      • robust-mix— Default QPSK/16-QAM profile that is more robust and more able to deal with noise than the mix profile.
    Note   

    You can also create custom modulation profiles with the cable modulation-profile command by configuring the values for the individual burst parameters. These parameters, however, should not be modified unless you are thoroughly familiar with how changing each parameter affects the DOCSIS MAC layer. We recommend using the preconfigured default modulation profiles for most cable plants.

     
    Step 4exit


    Example: 
    Router(config)# exit
     

    Exits global configuration mode.

     

    Creating a Mixed Mode Modulation Profile

    This section describes how to create a modulation profile for the mixed TDMA/A-TDMA mode of operation, using one of the preconfigured modulation profiles.

       Command or ActionPurpose
      Step 1enable


      Example: 
      Router> enable
       

      Enables privileged EXEC mode.

      Enter your password if prompted.

       
      Step 2configure terminal


      Example: 
      Router# configure terminal
       

      Enters global configuration mode.

       
      Step 3cable modulation-profile profile {mix-high | mix-low | mix-mid | mix-qam | qam-16 | qpsk | robust-mix-high | robust-mix-mid | robust-mix-qam}


      Example: 
      Router(config)# cable modulation-profile 143 mix-medium 
Router(config)# cable modulation-profile 144 mix-high
       

      Creates a preconfigured modulation profile, where the burst parameters are set to their default values for each burst type:

      • profile— Specifies the modulation profile number. The valid range depends on the cable interface line card:

        • For the Cisco uBR-MC5X20S/U card, the valid range is 121 to 130. The system creates profile 121 as a default mixed mode modulation profile.
        • For the Cisco uBR-MC16U/X and Cisco uBR-MC28U/X cards, the valid range is 141 to 150. The system creates profile 141 as a default mixed mode modulation profile.
      • The following preconfigured profiles are available:
        • mix-high and robust-mix-high—Default QPSK/64-QAM profile.
        • mix-low—Default QPSK/16-QAM profile.
        • mix-mid and robust-mix-mid— Default QPSK/32-QAM profile.
        • mix-qam and robust-mix-qam— Default 16-QAM/64-QAM profile.
        • qam-16— Default 16-QAM modulation profile.
        • qpsk— Default QPSK modulation profile.
      Note   

      The robust-mix profiles are similar to but more robust than the mix profiles, so that they more able to detail with noise on the upstream.

      Note   

      You can also create custom modulation profiles with the cable modulation-profile command by configuring the values for the individual burst parameters. These parameters, however, should not be modified unless you are thoroughly familiar with how changing each parameter affects the DOCSIS MAC layer. We recommend using the preconfigured default modulation profiles for most cable plants.

       
      Step 4exit


      Example: 
      Router(config)# exit
       

      Exits global configuration mode.

       

      Creating an A-TDMA Modulation Profile

      This section describes how to create a modulation profile for the DOCSIS 2.0 A-TDMA mode of operation, using one of the preconfigured modulation profiles.

         Command or ActionPurpose
        Step 1enable


        Example: 
        Router> enable
         

        Enables privileged EXEC mode. Enter your password if prompted.

         
        Step 2configure terminal


        Example: 
        Router# configure terminal
         

        Enters global configuration mode.

         
        Step 3cable modulation-profile profile {mix-high | mix-low | mix-mid | mix-qam | qam-8 | qam-16 | qam-32 | qam-64 | qpsk | robust-mix-high | robust-mix-low | robust-mix-mid}


        Example: 
        Router(config)# cable modulation-profile 242 qam-32 
Router(config)# cable modulation-profile 243 qam-64
         

        Creates a preconfigured modulation profile, where the burst parameters are set to their default values for each burst type:

        • profile— Specifies the modulation profile number. The valid range depends on the cable interface line card:

          • For the Cisco uBR-MC5X20S/U card, the valid range is 221 to 230. The system creates profile 221 as a default DOCSIS 2.0 A-TDMA mode modulation profile.
          • For the Cisco uBR-MC16U/X and Cisco uBR-MC28U/X cards, the valid range is 241 to 250. The system creates profile 241 as a default DOCSIS 2.0 A-TDMA mode modulation profile.

        • The following preconfigured profiles are available:

          • mix-high and robust-mix-high— Default QPSK/64-QAM profile.
          • mix-low and robust-mix-low— Default QPSK/16-QAM profile.
          • mix-mid and robust-mix-mid— Default QPSK/32-QAM profile.
          • mix-qam— Default 16-QAM/64-QAM profile.
          • qam-8— Default 8-QAM profile.
          • qam-16— Default 16-QAM profile.
          • qam-32— Default 32-QAM profile.
          • qam-64— Default 64-QAM profile.
          • qpsk— Default QPSK modulation profile.
        Note   

        The robust-mix profiles are similar to but more robust than the mix profiles, so that they more able to detail with noise on the upstream.

        Note   

        You can also create custom modulation profiles with the cable modulation-profile command by configuring the values for the individual burst parameters. These parameters, however, should not be modified unless you are thoroughly familiar with how changing each parameter affects the DOCSIS MAC layer. We recommend using the preconfigured default modulation profiles for most cable plants.

         
        Step 4exit


        Example: 
        Router(config)# exit
         

        Exits global configuration mode.

         

        Configuring the DOCSIS Mode and Profile on an Upstream

        This section describes how to configure an upstream for a DOCSIS mode of operation, and then to assign a particular modulation profile to that upstream.


        Note
        By default, all upstreams are configured for ATDMA-only mode, using the default modulation profile of 1, 21, or 41, depending on the cable interface line card.
           Command or ActionPurpose
          Step 1enable


          Example: 
          Router> enable
           

          Enables privileged EXEC mode. Enter your password if prompted.

           
          Step 2configure terminal


          Example: 
          Router# configure terminal
           

          Enters global configuration mode.

           
          Step 3interface cable x/y/z


          Example: 
          Router(config)# interface cable c5/1/1
           

          Enters interface configuration mode for the indicated cable downstream interface.

           
          Step 4cable upstream n docsis-mode {atdma | tdma | tdma-atdma}


          Example: 
          Router(config-if)# cable upstream 0 docsis-mode atdma 
Router(config-if)# cable upstream 1 docsis-mode tdma-atdma
           

          Configures the upstream for the desired DOCSIS mode of operation:

          • n— Specifies the upstream port. Valid values start with 0 for the first upstream port on the cable interface line card.
          • atdma— Configures the upstream for DOCSIS 2.0 A-TDMA modulation profiles only (default).
          • tdma— Configures the upstream for DOCSIS 1.X TDMA modulation profiles only.
          • tdma-atdma— Configures the upstream for both A-TDMA and TDMA operation (mixed mode).
           
          Step 5cable upstream n modulation-profile profile [profile2]


          Example: 
          Router(config-if)# cable upstream 0 modulation-profile 241 
Router(config-if)# cable upstream 1 modulation-profile 131
           

          Assigns the particular modulation profile to this upstream.

          • n— Specifies the upstream port. Valid values start with 0 for the first upstream port on the cable interface line card.

          • profile— Specifies the modulation profile to be used on this upstream. The valid range for the profile parameter depends on the current DOCSIS mode:

            • If the upstream is configured for DOCSIS 1.0 and DOCSIS 1.1 mode, the valid range is 21 to 30 for the Cisco uBR-MC5X20S, and 41 to 50 for the Cisco uBR-MC16U/X and Cisco uBR-MC28U/X. The valid range is 1 to 10 for all other cards.
            • If the upstream is configured for DOCSIS 1.X and DOCSIS 2.0 mixed mode, the valid range is 121 to 130 for the Cisco uBR-MC5X20S, and 141 to 150 for the Cisco uBR-MC16U/X and Cisco uBR-MC28U/X.
            • If the upstream is configured for DOCSIS 2.0 A-TDMA mode, the valid range is 221 to 230 for the Cisco uBR-MC5X20S, and 241 to 250 for the Cisco uBR-MC16U/X and Cisco uBR-MC28U/X.
          • profile2— (Optional) Specifies the number of a secondary modulation profile that the interface uses when noise on the upstream increases to the point that the primary modulation profile can no longer be used. (The secondary profile should specify a more robust profile, in terms of coping with noise, than the primary profile.)
          Note   

          The type of modulation profiles must match the DOCSIS mode configured for the upstream, using the cable upstream docsis-mode command.

           
          Step 6cable upstream n equalization-coefficient


          Example: 
          Router(config-if)# cable upstream 0 equalization-coefficient
           

          (Optional) Enables the use of a DOCSIS pre-equalization coefficient on an upstream.

          • n— Upstream port. Valid values start with 0 for the first upstream port on the cable interface line card.
           
          Step 7cable upstream n ingress-noise-cancellation interval


          Example: 
          Router(config-if)# cable upstream 0 ingress-noise-cancellation 400
           

          (Optional) Configures how often, in milliseconds, the line card should sample the signal on an upstream to correct any ingress noise that has appeared on that upstream.

          • n— Upstream port. Valid values start with 0 for the first upstream port on the cable interface line card.
          • interval— Sample interval. Valid range is 10 to 3000 milliseconds, with a default value of 200 milliseconds.
           
          Step 8cable upstream n maintain-psd


          Example: 
          Router(config-if)# cable upstream 0 maintain-psd
           

          (Optional) Requires DOCSIS 2.0 cable modems that are operating on an ATDMA-only upstream to maintain a constant power spectral density (PSD) after a modulation rate change.

          • n— Upstream port. Valid values start with 0 for the first upstream port on the cable interface line card.
          Note   

          Repeat Step 3 through Step 8 for each cable interface and upstream to be configured.

           
          Step 9end


          Example: 
          Router(config-if)# end
           

          Exits interface configuration mode and returns to privileged EXEC mode.

           

          Monitoring the DOCSIS 2.0 A-TDMA Services

          This section contains the following:

          Displaying Modulation Profiles

          To display the modulation profiles that are currently defined on the CMTS, use the show cable modulation-profile command without any options: 

          Router# show cable modulation-profile
 
Mod IUC     Type  Preamb Diff FEC    FEC   Scrambl Max  Guard Last Scrambl Preamb
                  length enco T      k     seed    B    time  CW           offset
                              BYTES  BYTES         size size  short
21  request qpsk  64     no   0x0    0x10  0x152   0    8     no   yes     0 
21  initial qpsk  128    no   0x5    0x22  0x152   0    48    no   yes     0 
21  station qpsk  128    no   0x5    0x22  0x152   0    48    no   yes     0 
21  short   qpsk  72     no   0x5    0x4B  0x152   6    8     yes  yes     0 
21  long    qpsk  80     no   0x8    0xDC  0x152   0    8     yes  yes     0 
121 request qpsk  64     no   0x0    0x10  0x152   0    8     no   yes     0 
121 initial qpsk  128    no   0x5    0x22  0x152   0    48    no   yes     0 
121 station qpsk  128    no   0x5    0x22  0x152   0    48    no   yes     0 
121 short   qpsk  72     no   0x5    0x4B  0x152   6    8     yes  yes     0 
121 long    qpsk  80     no   0x8    0xDC  0x152   0    8     yes  yes     0 
121 a-short 64qam 128    no   0x5    0x63  0x152   10   8     yes  yes     0 
121 a-long  64qam 128    no   0xF    0xC8  0x152   0    8     yes  yes     0 
221 request qpsk  64     no   0x0    0x10  0x152   0    8     no   yes     0 
221 initial qpsk  128    no   0x5    0x22  0x152   0    48    no   yes     0 
221 station qpsk  128    no   0x5    0x22  0x152   0    48    no   yes     0 
221 short   qpsk  72     no   0x5    0x4B  0x152   6    8     yes  yes     0 
221 long    qpsk  80     no   0x8    0xDC  0x152   0    8     yes  yes     0 
221 a-short 64qam 128    no   0x5    0x63  0x152   10   8     yes  yes     0 
221 a-long  64qam 128    no   0xF    0xC8  0x152   0    8     yes  yes     0 
Router#

          To display a specific modulation profile in detail, specify the profile number with the show cable modulation-profile command: 

          Router# show cable modulation-profile 221
 
Mod IUC     Type  Pre Diff FEC  FEC  Scrmb Max Guard Last Scrmb Pre   Pre   RS
                  len enco T    k    seed  B   time  CW         offst Type
                           BYTE BYTE       siz size  short
221 request qpsk  68  no   0x0  0x10 0x152 0   8     no   yes   0     qpsk0 no 
221 initial qpsk  2   no   0x0  0x10 0x0   0   0     no   no    0     qpsk1 no 
221 station qpsk  128 no   0x5  0x22 0x152 0   48    no   yes   0     qpsk0 no 
221 a-short 32qam 160 no   0x9  0x4C 0x152 6   8     yes  yes   0     qpsk1 no 
221 a-long  64qam 132 no   0xC  0xE7 0x152 0   8     yes  yes   0     qpsk1 no 
221 a-ugs   16qam 80  no   0x3  0xE7 0x152 0   8     yes  yes   0     qpsk1 no 
Router#

          Displaying Cable Modem Capabilities and Provisioning

          To display the capabilities of the online cable modems and how the modems were provisioned, use the show cable modem mac command: 

          Router# show cable modem mac
 
MAC Address    MAC         Prim  Ver    Prov    Frag Concat PHS Priv  DS    US
               State       Sid                                        Saids Sids
0007.0e03.69a1 online      2     DOC1.1 DOC1.1  yes  yes    yes BPI+  0     4   
0007.0e03.6a05 online      3     DOC1.1 DOC1.1  yes  yes    yes BPI+  0     4   
0007.0e03.6981 online      4     DOC1.1 DOC1.1  yes  yes    yes BPI+  0     4   
0007.0e03.69e9 online      2     DOC1.1 DOC1.1  yes  yes    yes BPI+  0     4   
0090.963e.d312 online(pt)  4     DOC1.1 DOC1.0  no   yes    yes BPI   8     4   
0008.0e06.7a90 online(pt)  56    DOC1.0 DOC1.0  no   yes    no  BPI   0     0   
0002.8a0e.a392 online(pt)  57    DOC1.0 DOC1.0  no   no     no  BPI   0     0   
0000.39e8.9a4e online(pt)  58    DOC1.0 DOC1.0  no   yes    no  BPI   0     0   
0000.39ac.4e57 online      151   DOC2.0 DOC1.0  no   yes    no  BPI   0     0   
0090.963e.d314 online(pt)  152   DOC1.1 DOC1.0  no   yes    yes BPI   8     4   
0008.0e06.7ab8 online(pt)  153   DOC2.0 DOC1.0  no   yes    no  BPI   0     0   
0007.0e03.6cf5 online(pt)  154   DOC1.0 DOC1.0  no   yes    no  BPI   0     0   
0007.0e03.69f1 online      155   DOC1.1 DOC1.0  no   yes    yes BPI+  0     4   
0007.0e03.6855 online      156   DOC1.1 DOC1.0  no   yes    yes BPI+  0     4   
0007.0e03.6ca1 online      157   DOC1.1 DOC1.0  no   yes    yes BPI+  0     4   
0050.daf8.0296 online(pt)  158   DOC1.0 DOC1.0  no   no     no  BPI   0     0   
0002.8a0e.a38c online(pt)  159   DOC2.0 DOC2.0  no   no     no  BPI   0     0 
Router#

          To display how many cable modems of each DOCSIS type are online each upstream, use the show cable modem mac summary command: 

          Router# show cable modem mac summary
 
                             Cable Modem Summary
                             -------------------
                          Mac Version                   Provision Mode
Interface       Total   DOC2.0  DOC1.1  DOC1.0   Reg/Online   DOC 2.0  DOC1.1   DOC1.0
Cable3/0/U1     1       0        1       0        1           0        1        0
Cable3/0/U2     1       0        1       0        1           0        1        0
Cable3/0/U3     1       0        1       0        1           0        1        0
Cable3/1/U0     1       0        1       0        1           0        0        1
Cable3/1/U1     1       0        0       1        1           0        0        1
Cable3/1/U2     3       0        1       2        3           0        1        2
Cable6/0/U1     9       1        5       3        9           1        0        8
Cable6/0/U2     1       0        1       0        1           0        0        1
Cable6/0/U2     2       2        0       0        2           2        0        0
Router#

          Configuration Examples for DOCSIS 2.0 A-TDMA services

          This section contains the following:

          Creating Modulation Profiles Examples

          This section contains the following:

          Example: DOCSIS 1.0/DOCSIS 1.1 TDMA Modulation Profiles

          The following sample configurations show typical modulation profiles for the DOCSIS 1.0/DOCSIS 1.1 TDMA mode of operation when using the Cisco uBR-MC5X20S/U cable interface line card:

          • Profile 1 is the default profile for TDMA operations that is automatically created on the router for legacy cable interface line cards.
          • Profile 21 is the default profile for TDMA operations that is automatically created on the router for the Cisco uBR-MC5X20S/U card.
          • Profiles 24 and 25 use the preconfigured 16-QAM and QPSK modulation profiles.
          • Profile 26 is a typical QPSK modulation profile using some customized burst parameters. 
          cable modulation-profile 1 request 0 16 0 8 qpsk scrambler 152 no-diff 64 fixed uw8
cable modulation-profile 1 initial 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16
cable modulation-profile 1 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed uw16
cable modulation-profile 1 short 4 76 12 8 qpsk scrambler 152 no-diff 72 shortened uw8
cable modulation-profile 1 long 9 236 0 8 qpsk scrambler 152 no-diff 80 shortened uw8
cable modulation-profile 24 qam-16 
cable modulation-profile 25 qpsk 
cable modulation-profile 26 request 0 16 0 8 qpsk scrambler 152 no-diff 68 fixed 
cable modulation-profile 26 initial 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed 
cable modulation-profile 26 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed 
cable modulation-profile 26 short 4 76 12 8 qpsk scrambler 152 no-diff 80 shortened 
cable modulation-profile 26 long 8 236 0 8 qpsk scrambler 152 no-diff 80 shortened

          Example: Mixed TDMA/A-TDMA Modulation Profiles

          The following sample configurations show typical modulation profiles for the DOCSIS 1.X/DOCSIS 2.0 mixed TDMA/A-TDMA mode of operation:

          • Profile 121 is the default profile for mixed mode operations that is automatically created on the router for the Cisco uBR-MC5X20S/U card.
          • Profiles 122 through 126 use the preconfigured mixed mode modulation profiles.
          • Profile 127 is a typical mixed mode modulation profile some customized burst parameters. 
          cable modulation-profile 121 request 0 16 0 8 qpsk scrambler 152 no-diff 64 fixed uw8
cable modulation-profile 121 initial 5 34 0 48 qpsk scrambler 152 no-diff 32 fixed uw16
cable modulation-profile 121 station 5 34 0 48 qpsk scrambler 152 no-diff 32 fixed uw16
cable modulation-profile 121 short 5 75 6 8 qpsk scrambler 152 no-diff 72 shortened uw8
cable modulation-profile 121 long 8 220 0 8 qpsk scrambler 152 no-diff 80 shortened uw8
cable modulation-profile 121 a-short qpsk0 0 18 5 99 10 8 64qam scrambler 152 no-diff 128 shortened uw8
cable modulation-profile 121 a-long qpsk0 0 18 15 200 0 8 64qam scrambler 152 no-diff 128 shortened uw8
cable modulation-profile 122 mix-high 
cable modulation-profile 123 mix-low 
cable modulation-profile 124 mix-medium 
cable modulation-profile 125 qam-16 
cable modulation-profile 126 qpsk 
cable modulation-profile 127 request 0 16 0 8 qpsk scrambler 152 no-diff 68 fixed 
cable modulation-profile 127 initial 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed 
cable modulation-profile 127 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed 
cable modulation-profile 127 short 6 76 7 8 16qam scrambler 152 no-diff 160 shortened 
cable modulation-profile 127 long 8 231 0 8 16qam scrambler 152 no-diff 160 shortened 
cable modulation-profile 127 a-short 9 76 6 8 32qam scrambler 152 no-diff 160 shortened qpsk1 1 2048 
cable modulation-profile 127 a-long 12 231 0 8 64qam scrambler 152 no-diff 132 shortened qpsk1 1 2048

          Example: DOCSIS 2.0 A-TDMA Modulation Profiles

          The following sample configurations show typical modulation profiles for the DOCSIS 2.0 A-TDMA mode of operation:

          • Profile 221 is the default profile for A-TDMA mode operations.
          • Profiles 222 through 226 use the preconfigured A-TDMA mode modulation profiles.
          • Profile 227 is a typical A-TDMA mode modulation profile customized burst parameters. 
          cable modulation-profile 221 request qpsk0 0 0 0 16 0 8 qpsk scrambler 152 no-diff 64 fixed uw8
cable modulation-profile 221 initial qpsk0 0 0 5 34 0 48 qpsk scrambler 152 no-diff 32 fixed uw16
cable modulation-profile 221 station qpsk0 0 0 5 34 0 48 qpsk scrambler 152 no-diff 32 fixed uw16
cable modulation-profile 221 short qpsk0 0 0 5 75 6 8 qpsk scrambler 152 no-diff 72 shortened uw8
cable modulation-profile 221 long qpsk0 0 0 8 220 0 8 qpsk scrambler 152 no-diff 80 shortened uw8
cable modulation-profile 221 a-short qpsk0 0 18 5 99 10 8 64qam scrambler 152 no-diff 128 shortened uw8
cable modulation-profile 221 a-long qpsk0 0 18 15 200 0 8 64qam scrambler 152 no-diff 128 shortened uw8

cable modulation-profile 222 qam-8 
cable modulation-profile 223 qam-16 
cable modulation-profile 224 qam-32 
cable modulation-profile 225 qam-64 
cable modulation-profile 226 qpsk 

cable modulation-profile 227 request 0 16 0 8 qpsk scrambler 152 no-diff 68 fixed qpsk0 1 2048 
cable modulation-profile 227 initial 0 16 0 0 qpsk no-scrambler no-diff 2 fixed qpsk1 0 18 
cable modulation-profile 227 station 5 34 0 48 qpsk scrambler 152 no-diff 128 fixed qpsk0 1 2048 
cable modulation-profile 227 a-short 9 76 6 8 32qam scrambler 152 no-diff 160 shortened qpsk1 1 2048 
cable modulation-profile 227 a-long 12 231 0 8 64qam scrambler 152 no-diff 132 shortened qpsk1 1 2048 
cable modulation-profile 227 a-ugs 3 231 0 8 16qam scrambler 152 no-diff 80 shortened qpsk1 1 2048

          Assigning Modulation Profiles to Upstreams Examples

          This section contains the following:

          Example: Assigning DOCSIS 1.0/DOCSIS 1.1 TDMA Modulation Profiles

          The following sample configuration shows DOCSIS 1.0/DOCSIS 1.1 TDMA modulation profiles being assigned to the upstreams on two cable interfaces on the Cisco uBR-MC5X20S/U cable interface line card. The TDMA modulation profile (profile 21) is assigned to the upstreams on cable interface 5/1/0, and modulation profile 22 is assigned to the upstreams on cable interface 5/1/1.


          Note

          Starting with Cisco IOS Release 12.2(33)SCG, the cable upstream docsis-mode atdma command is the default configuration for upstreams, so this command is not shown in these sample configurations. 

          interface Cable5/1/0 
 ip address 22.0.0.1 255.0.0.0
 ip helper-address 10.10.0.4
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream channel-id 2
 cable upstream 0 frequency 30000000
 cable upstream 0 power-level 0
 cable upstream 0 channel-width 1600000
 cable upstream 0 minislot-size 4
 cable upstream 0 modulation-profile 21
 no cable upstream 0 shutdown
 cable upstream 1 channel-width 1600000
 cable upstream 1 minislot-size 4
 cable upstream 1 modulation-profile 21
 cable upstream 1 shutdown
 cable upstream 2 channel-width 1600000
 cable upstream 2 minislot-size 4
 cable upstream 2 modulation-profile 21
 cable upstream 2 shutdown
 cable upstream 3 channel-width 1600000
 cable upstream 3 minislot-size 4
 cable upstream 3 modulation-profile 21
 cable upstream 3 shutdown
 cable upstream 4 channel-width 1600000
 cable upstream 4 minislot-size 4
 cable upstream 4 modulation-profile 21
 cable upstream 4 shutdown
 cable upstream 5 channel-width 1600000
 cable upstream 5 minislot-size 4
 cable upstream 5 modulation-profile 21
 cable upstream 5 shutdown 
!
interface Cable5/1/1 
 ip address 21.0.0.1 255.0.0.0
 ip helper-address 10.10.0.4
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream channel-id 2
 cable upstream 0 frequency 30000000
 cable upstream 0 power-level 0
 cable upstream 0 channel-width 1600000 1600000
 cable upstream 0 minislot-size 4
 cable upstream 0 modulation-profile 22
 no cable upstream 0 shutdown
 cable upstream 1 channel-width 1600000 1600000
 cable upstream 1 minislot-size 4
 cable upstream 1 modulation-profile 22
 cable upstream 1 shutdown
 cable upstream 2 channel-width 1600000 1600000
 cable upstream 2 minislot-size 4
 cable upstream 2 modulation-profile 22
 cable upstream 2 shutdown
 cable upstream 3 channel-width 1600000 1600000
 cable upstream 3 minislot-size 4
 cable upstream 3 modulation-profile 22
 cable upstream 3 shutdown

          Example: Assigning Mixed TDMA/A-TDMA Modulation Profiles

          The following sample configuration shows mixed mode TDMA/A-TDMA modulation profiles being assigned to the upstreams on a cable interface on the Cisco uBR-MC5X20S/U cable interface line card. All upstreams are configured for mixed mode and profile 121 is assigned to them, but only the first upstream is enabled. 

          interface Cable5/1/2
 ip address 21.0.0.1 255.0.0.0
 ip helper-address 10.10.0.4
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream channel-id 2
 cable upstream 0 frequency 30000000
 cable upstream 0 docsis-mode tdma-atdma
 cable upstream 0 power-level 0
 cable upstream 0 channel-width 1600000 1600000
 cable upstream 0 minislot-size 4
 cable upstream 0 modulation-profile 121
 no cable upstream 0 shutdown
 cable upstream 1 docsis-mode tdma-atdma
 cable upstream 1 channel-width 1600000 1600000
 cable upstream 1 minislot-size 4
 cable upstream 1 modulation-profile 121
 cable upstream 1 shutdown
 cable upstream 2 docsis-mode tdma-atdma
 cable upstream 2 channel-width 1600000 1600000
 cable upstream 2 minislot-size 4
 cable upstream 2 modulation-profile 121
 cable upstream 2 shutdown
 cable upstream 3 docsis-mode tdma-atdma
 cable upstream 3 channel-width 1600000 1600000
 cable upstream 3 minislot-size 4
 cable upstream 3 modulation-profile 121
 cable upstream 3 shutdown

          Example: Assigning DOCSIS 2.0 A-TDMA Modulation Profiles

          The following sample configuration shows DOCSIS 2.0 A-TDMA modulation profiles being assigned to the upstreams on two cable interfaces on the Cisco uBR-MC5X20S/U cable interface line card. Only the first upstream on cable interface c7/1/1 is enabled for A-TDMA mode and assigned an A-TDMA profile. The first three upstreams on cable interface c7/1/2 are enabled for A-TDMA mode, and they are using the default A-TDMA modulation profile of 221. 

          interface Cable7/1/1
 ip address 20.0.0.1 255.0.0.0
 ip helper-address 10.10.0.4
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream channel-id 1
 cable upstream 0 frequency 30000000
 cable upstream 0 docsis-mode atdma
 cable upstream 0 power-level 0
 cable upstream 0 channel-width 6400000 6400000
 cable upstream 0 minislot-size 1
 cable upstream 0 modulation-profile 221
 no cable upstream 0 shutdown
 cable upstream 1 channel-width 1600000 1600000
 cable upstream 1 minislot-size 4
 cable upstream 1 modulation-profile 41
 cable upstream 1 shutdown
 cable upstream 2 channel-width 1600000 1600000
 cable upstream 2 minislot-size 4
 cable upstream 2 modulation-profile 41
 cable upstream 2 shutdown
 cable upstream 3 channel-width 1600000 1600000
 cable upstream 3 minislot-size 4
 cable upstream 3 modulation-profile 41
 cable upstream 3 shutdown
!
interface Cable7/1/2
 ip address 71.2.1.1 255.255.255.0 secondary
 ip address 71.72.71.1 255.255.255.0
 load-interval 30
 no keepalive
 cable map-advance static
 cable downstream annex B
 cable downstream modulation 256qam
 cable downstream interleave-depth 32
 cable downstream frequency 459000000
 cable downstream channel-id 2
 no cable downstream rf-shutdown
 cable upstream 0 frequency 30000000
 cable upstream 0 docsis-mode atdma
 cable upstream 0 power-level 0
 no cable upstream 0 concatenation
 no cable upstream 0 fragmentation
 cable upstream 0 modulation-profile 221
 no cable upstream 0 shutdown
 cable upstream 1 frequency 5104000
 cable upstream 1 docsis-mode atdma
 cable upstream 1 power-level 6
 cable upstream 1 channel-width 200000
 cable upstream 1 minislot-size 32
 cable upstream 1 modulation-profile 221
 cable upstream 1 shutdown
 cable upstream 2 frequency 38800000
 cable upstream 2 power-level 0
 cable upstream 2 channel-width 800000
 cable upstream 2 minislot-size 32
 cable upstream 2 modulation-profile 221
 cable upstream 2 shutdown
 cable upstream 3 docsis-mode atdma
 cable upstream 3 frequency 14000000
 cable upstream 3 power-level -6
 cable upstream 3 channel-width 400000
 cable upstream 3 minislot-size 32
 cable upstream 3 modulation-profile 221
 cable upstream 3 shutdown

          Additional References

          Related Documents

          Related Topic

          Document Title

          Cisco CMTS Commands

          Cisco IOS CMTS Cable Command Reference

          http:/​/​www.cisco.com/​en/​US/​docs/​ios/​cable/​command/​reference/​cbl_​book.html

          Configuring the Cisco uBR-MC16U/X Card

          Configuring the Cisco uBR-MC16U/MC16X Cable Interface Line Card , at the following URL:

          http:/​/​www.cisco.com/​en/​US/​docs/​interfaces_modules/​cable/​line_cards/​ubr16u_x/​configuration/​guide/​mc16uxfm.html

          Configuring the Cisco uBR-MC28U/X Card

          Configuring the Cisco uBR-MC28U/MC28X Cable Interface Line Card , at the following URL:

          http:/​/​www.cisco.com/​en/​US/​docs/​interfaces_modules/​cable/​line_cards/​ubr28u_x/​configuration/​guide/​mc28uxfm.html

          Standards

          Standards

          Title

          SP-RFIv1.1-I09-020830

          Data-over-Cable Service Interface Specifications Radio Frequency Interface Specification, version 1.1

          SP-RFIv2.0-I03-021218

          Data-over-Cable Service Interface Specifications Radio Frequency Interface Specification, version 2.0

          SP-OSSIv2.0-I03-021218

          Data-over-Cable Service Interface Specifications Operations Support System Interface Specification, version 2.0

          SP-BPI+-I09-020830

          Data-over-Cable Service Interface Specifications Baseline Privacy Plus Interface Specification, version 2.0

          RFC 2233

          DOCSIS OSSI Objects Support

          RFC 2665

          DOCSIS Ethernet MIB Objects Support

          RFC 2669

          Cable Device MIB

          MIBs

          MIBs

          MIBs Link

          • DOCS-BPI-PLUS-MIB
          • DOCS-CABLE-DEVICE-MIB (RFC 2669)
          • DOCS-CABLE-DEVICE-TRAP-MIB
          • DOCS-IF-EXT-MIB
          • DOCS-IF-MIB (RFC 2670)
          • DOCS-QOS-MIB
          • DOCS-SUBMGT-MIB
          • IGMP-STD-MIB (RFC 2933)

          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 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers

          Use Cisco Feature Navigator to find information about 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 http:/​/​www.cisco.com/​go/​cfn. An account on Cisco.com is not required.


          Note

          The table below lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

          Table 5 Feature Information for DOCSIS 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers

          Feature Name

          Releases

          Feature Information

          DOCSIS 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers

          12.2(15)CX

          This feature was introduced for the Cisco uBR-MC16U/X and Cisco uBR-MC28U/X cable interface line cards on the Cisco uBR7246VXR router.

          The following commands are new or modified:

          • cable modulation-profile
          • cable upstream channel-width
          • cable upstream docsis-mode
          • cable upstream equalization-coefficient
          • cable upstream maintain-psd
          • cable upstream minislot-size
          • cable upstream modulation-profile
          • show cable modulation-profile
          • show interface cable mac-schedule
          • show cable modem verbose
          • show cable modem phy
          • show controllers cable

          DOCSIS 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers

          12.2(15)BC2

          This feature was supported on the Cisco uBR-MC5X20S/U cable interface line cards on the Cisco uBR10012 router.

          DOCSIS 2.0 A-TDMA Modulation Profiles for the Cisco CMTS Routers

          12.2(33)SCA

          This feature was integrated into Cisco IOS Release 12.2(33)SCA. Support for the Cisco uBR7225VXR Universal Broadband Router was added.