S-CDMA and Logical Channel Support on the Cisco CMTS Routers

First Published: November 9, 2009

Last Updated: November 29, 2010

Cisco IOS Release 12.2(33)SCC introduces the S-CDMA and Logical Channel Support feature, which provides support for Synchronous Code Division Multiple Access (S-CDMA) upstream modulation profiles and logical channels on the Cisco cable modem termination systems (CMTS) routers.

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Contents

Prerequisites for S-CDMA and Logical Channel Support

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

Table 1 S-CDMA and Logical Channel Support 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(33)SCA and later releases

  • PRE2

Cisco IOS Release 12.2(33)SCB and later releases

  • PRE4

Cisco IOS Release 12.2(33)SCH and later releases

  • PRE5

Cisco IOS Release 12.2(33)SCC and later releases

  • Cisco uBR10-MC5X20H1
  • Cisco UBR-MC20X20V2

Cisco IOS Release 12.2(33)SCE and later releases

  • Cisco uBR-MC3GX60V 3

Cisco uBR7246VXR Universal Broadband Router

Cisco IOS Release 12.2(33)SCD and later releases

  • NPE-G2

Cisco IOS Release 12.2(33)SCD and later releases

  • Cisco uBR-MC88V4

Cisco uBR7225VXR Universal Broadband Router

Cisco IOS Release 12.2(33)SCD and later releases

  • NPE-G2

Cisco IOS Release 12.2(33)SCD and later releases

  • Cisco uBR-MC88V5
1 The S-CDMA feature is not supported on the Cisco uBR10-MC5X20H cable interface line card.
2 The Cisco UBR-MC20X20V cable interface line card has three variants: Cisco UBR-MC20X20V-0D, Cisco UBR-MC20X20V-5D, and Cisco UBR-MC20X20V-20D. The Cisco UBR-MC20X20V-0D line card supports 20 upstreams and zero (no) downstreams. The Cisco UBR-MC20X20V-5D line card supports 20 upstreams and 5 downstreams, and the Cisco UBR-MC20X20V-20D line card supports 20 upstreams and 20 downstreams.
3 Cisco uBR3GX60V cable interface line card is not compatible with PRE2. You must use PRE4 with the Cisco uBR3GX60V cable interface line card.
4 The Cisco uBR-MC88V cable interface line card is not compatible with NPE-G1. You must use NPE-G2 with the Cisco uBR-MC88V cable interface line card.
5 The Cisco uBR-MC88V cable interface line card is not compatible with NPE-G1. You must use NPE-G2 with the Cisco uBR-MC88V cable interface line card.

Note
Any reference to the Cisco UBR-MC20X20V cable interface line card used in this document is also applicable to its three variants—Cisco UBR-MC20X20V-0D, Cisco UBR-MC20X20V-5D, and Cisco UBR-MC20X20V-20D.
  • The cable physical plant must be capable of supporting the higher bandwidth S-CDMA modulation profiles.
  • DOCSIS 2.0 compliant cable modems (CMs).
  • DOCSIS 1.0 or DOCSIS 1.1 provisioned DOCSIS configuration file.
  • Upstream configured for DOCSIS 2.0 S-CDMA or DOCSIS 3.0 S-CDMA mode.
  • Complete a basic configuration of the 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 Wide Area Network (WAN) adapter to provide backbone connectivity.
  • Determine a channel plan for your router and all of its cable interfaces.
  • Verify that your headend site includes all necessary servers to support DOCSIS and Internet connectivity, including Dynamic Host Configuration Protocol (DHCP), Time of Day (ToD), and Trivial File Transfer Protocol (TFTP) servers.
  • The system clock on the router should be set to the current date and time to ensure that the system logs have the proper timestamp and the Baseline Privacy Interface Plus (BPI+) subsystem uses the correct timestamp for verifying cable modem digital certificates.

Restrictions for S-CDMA and Logical Channel Support

The S-CDMA feature has the following restrictions and limitations:

  • The S-CDMA feature is not supported on the Cisco uBR10-MC5X20H cable interface line card.
  • DOCSIS 1.0 provisioned CM configuration file is not recommended or allowed for cable modems on the S-CDMA channel.
  • The Cisco IOS Release 12.2(33)SCC supports a maximum of 10 modulation profiles for each of the DOCSIS 2.0 A-TDMA and S-CDMA modes. However, if you enable the global modulation profile there is no restriction on the number of modulation profiles you can use, and can assign any modulation profile number to any DOCSIS mode.
  • Advanced hardware-based spectrum management features (such as guided frequency hopping, dynamic upstream modulation, and proactive carrier-to-noise ratio [CNR] based frequency hopping and channel width changes) are not supported for S-CDMA upstreams.
  • 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.
  • For the S-CDMA high availability, there should be timestamp, minislot, and frame counters synchronization between the working and the protect line cards.
  • The DOCSIS 3.0 option scdma-d3 (4SR) is available only when the CMTS is configured to operate in the global modulation profile format.
  • If you revert to the legacy modulation profile from the global modulation profile, all the modulation profiles that are outside of the legacy number space range are lost.

The Logical Channel Support feature has the following restrictions and limitations:

  • The CMTS must support the logical channel types 3S and 4SR individually on the Cisco uBR-MC88V cable interface line card.
  • The Cisco uBR10-MC5X20H, Cisco UBR-MC20X20V, and Cisco uBR-MC88Vcable interface line cards can only support up to two logical channels per physical port.
  • The upstream bonding at the logical channel level is supported with the following limitations:
    • The upstream bonding of the logical channels from the same physical port (on the same radio frequency spectrum) is not allowed.
    • The upstream bonding is available only to the first logical channel on each physical port.
  • Admission control policy cannot be configured at the logical channel level.
  • Load balancing is restricted only to the first logical channel. However, the secondary logical channel can be selected as the source channel and not the target channel. That is, load balancing can only move modems from the secondary logical channel, and not to the secondary logical channel.

Information About S-CDMA and Logical Channel Support

The following sections describe the S-CDMA and Logical Channel Support feature:

S-CDMA Services

S-CDMA provides a number of advanced physical layer (PHY) capabilities as per the new DOCSIS 3.0 specifications, which improves the maximum upstream bandwidth on cable networks.

The S-CDMA feature allows the same physical RF upstream channel to receive multiple bursts simultaneously. It uses a two-dimensional (time and code) data transmission technique where multiple modems can simultaneously send their data, each using their own codes, in the same time slot. The codes are orthogonal in nature and do not interfere with each other.

Data is sent over an array of up to 128 spreading codes and all modems are required to transmit their data at precisely the same time. This means that the CMTS and modems have to be synchronized at the symbol clock level (known as synchronous CDMA).

A burst from a particular cable modem may be transmitted on two or more codes (out of the available 128 codes) in one or more frames. A frame can contain bursts transmitted simultaneously from multiple CMs (each on a separate subset of codes) defined as per MAP messages.

The S-CDMA feature allows cable system operators to utilize parts of the upstream below 20 MHz that was previously unusable due to noise conditions. This type of noise cannot be removed with the ingress noise cancellation technology available as part of the DOCSIS 2.0 standard.

The S-CDMA feature incorporates the following advantages and improvements on DOCSIS 3.0 networks:

  • Upstreams can be configured for two different modes to support different mixes of cable modems:
    • S-CDMA mode to support DOCSIS 2.0 cable modems.
    • S-CDMA-d3 mode to support DOCSIS 3.0 cable modems.
  • S-CDMA-d3 mode allows DOCSIS 3.0 modems to use all data interval usage codes (IUC) like IUC 5, 6, 9, 10, and 11 for data bursts.
  • S-CDMA mode of operation provides higher bandwidth on the upstream using 64-QAM, 32-QAM, 16-QAM, 8-QAM, and QPSK modulation profiles.

The table below shows the maximum data rates supported on S-CDMA.

Table 2 Maximum S-CDMA 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

Modulation Profiles

To simplify the administration of Advanced Time Division Multiple Access (A-TDMA) and S-CDMA modulation profiles, the S-CDMA 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 (321 and 381) cannot be deleted.

A new global modulation profile is introduced in Cisco IOS Release 12.2(33)SCC, which allows you to assign any modulation profile number to any DOCSIS mode.

The table below lists the valid modulation profile ranges according to the cable interface and modulation type:

Table 3 Allowable Ranges for Modulation Profiles

Cable Interface

DOCSIS 2.0 (S-CDMA)

DOCSIS 3.0 (S-CDMA)

Cisco UBR-MC20X20V

321 to 330 (default is 321)

1 to 400 (default is 381)

Cisco uBR-MC88V

321 to 330 (default is 321)

1 to 400 (default is 381)

Global Modulation Profile

Cisco IOS Release 12.2(33)SCC introduces the global modulation profile scheme, which allows you to assign any modulation profile number to any DOCSIS mode up to 400. It eliminates the number space restriction and increases the number of modulation profiles that can be created per DOCSIS mode. Currently, there is a restriction of 10 modulation profiles per DOCSIS mode.

In global modulation profile scheme, you can assign any number between 1 to 400 to any modulation profiles. The global modulation profile mode allows you to create and configure DOCSIS 3.0 channel type 4SR (scdma-d3). When the DOCSIS mode of an upstream is changed into scdma-d3, it is initially assigned to the system created default modulation profile as shown in Table 1.


Note
Though you can assign any number between 1 to 400 to any modulation profile, the default modulation profile number assigned to an upstream channel for a given channel type will remain the same. That is, modulation profile numbers 21, 121, 221, 321, and 381 will be applicable for TDMA, mixed, A-TDMA, S-CDMA, and DOCSIS 3.0 S-CDMA channel types.

All the existing and previously defined modulation profiles are converted to the new format. However, all the newly created modulation profiles, which are outside of the legacy number space range, will be lost when you revert to the legacy modulation profile.

The new global modulation profile scheme is enabled using the cable modulation-profile global-scheme command. For more details on this command, refer to the Cisco IOS CMTS Cable Command Reference .

Benefits

The S-CDMA feature provides the following benefits:

  • Provides full compatibility with DOCSIS 2.0 and DOCSIS 3.0 cable modems (CMs) and cable modem termination systems (CMTS).
  • Increases protection against electronic impairments that occur in cable systems, allowing for a more robust operating environment.
  • Supports S-CDMA ingress noise cancellation technology that provide more knobs for fine tuning.
  • Supports all existing upstream bonding capabilities for Time Division Multiple Access (TDMA) and A-TDMA channels under S-CDMA.
  • Supports up to two logical channel combinations for the Cisco UBR-MC20X20V and Cisco uBR-MC8X8V cable interface line cards.
  • Supports the In-Service Software Upgrade (ISSU) feature.

Logical Channels

The concept of a logical channel refers to time-division multiplexing (TDM) of the same radio frequency (RF) spectrum allocated to one physical upstream port. All logical upstream channels defined within the physical upstream port share the same upstream RF spectrum or the bandwidth. The MAC-scheduler is responsible for managing how that common bandwidth is shared or distributed.

Using the Logical Channel Support feature, cable system operators can segment and time-multiplex one spectrum for supporting the legacy modems, near and far modems, and newer DOCSIS 3.0 modems with various service levels.

The Logical Channel Support feature provides the following benefits to cable service providers and their partners and customers:

  • Switchovers between the same cable interface line cards at the logical channel level, as part of high availability (HA). For example, switchover from Cisco uBR10-MC5X20H line card to Cisco uBR10-MC5X20H line card is supported.
  • Support for the In-Service Software Upgrade (ISSU) feature.

Each logical channel has its own Upstream Channel ID, upstream channel descriptor (UCD) messages, and Mini-slot Allocation Packet (MAP) messages. The logical channels on their own must satisfy the ranging and UCD change requirements that are imposed on a legacy standalone upstream channel.

The Cisco uBR10-MC5X20H and Cisco UBR-MC20X20V cable interface line cards support two logical channel combinations per physical port.

When two logical channels are configured through the cable upstream max-logical-chans command, both logical channels are mapped to the same physical port specified and the physical upstream bandwidth is shared between the two logical channels. However, from the cable modem perspective, each logical channel appears as an independent upstream channel.

When multiple logical channels are configured, the upstream-related commands are categorized into physical port level and logical channel level groups. Logical channel level commands use the format of cable upstream n m, where n denotes the physical port number, and m denotes the logical channel index number.

For more details on the cable upstream max-logical-chans command, refer to the Cisco IOS CMTS Cable Command Reference .

Spectrum Management on Logical Channels

Spectrum management allows you to prevent long-term service interruptions caused by upstream noise events in the cable plant. Spectrum management is also used for fault management and troubleshooting the cable network.

The Logical Channel Support feature supports all the basic spectrum management features. Some spectrum management features operate on the physical port level while others operate at the logical channel level.

The spectrum group assignment feature operates at the physical port level, and the Dynamic Upstream Modulation feature using Signal-to-Noise Ratio (SNR) operates at the logical channel level.

For more information on spectrum management, refer to the Spectrum Management and Advanced Spectrum Management for the Cisco CMTS Routers document at the following location: http:/​/​www.cisco.com/​en/​US/​docs/​ios/​cable/​configuration/​guide/​cmts_​spctrm_​mgt.html

Load Balancing on Logical Channels

The Load Balancing (LB) feature allows cable system operators to distribute cable modems across RF downstream and upstream channels on the same cable interface line card, or across multiple cable interface line cards in some circumstances. Load balancing maximizes bandwidth and usage of the cable plant.

Load balancing is supported on logical channels using a two-tiered approach—the first level uses the traditional load balancing to move modems between the physical channels, and the second level moves modems amongst the logical channels.

The first level of load balancing (known as Cisco LB implementation) moves the modems amongst the physical upstream channels, identified in the load balancing group. It uses the aggregate upstream channel utilization statistics of a physical channel, including that of all logical channels, to perform load balancing.

The second level of load balancing moves modems among the logical channels defined within a physical channel (no outside moves). It is referred to as “per CM spectrum management” as it is strictly based on the physical channel parameters or conditions, or the physical layer capabilities of the CM.

For more information on the LB feature, refer to the Load Balancing and Dynamic Channel Change on the Cisco CMTS Routers document at the following location: http:/​/​www.cisco.com/​en/​US/​docs/​ios/​cable/​configuration/​guide/​ubr_​load-bal_​dcc.html

How to Configure S-CDMA and Logical Channel Support

This section describes the following tasks that are required to implement S-CDMA and Logical Channel Support:

Creating Modulation Profiles

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


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.

Creating a DOCSIS 2.0 S-CDMA Modulation Profile

This section describes how to create a modulation profile for the DOCSIS 2.0 S-CDMA 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 qam-16


    Example: 
    Router(config)# cable modulation-profile 322 qam-16
     

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

    • profile —Modulation profile number. The valid range is from 321 to 330. The system creates profile 321 as the default modulation profile.
    • qam-16—Default 16-QAM profile.
     
    Step 4exit


    Example: 
    Router(config)# exit
     

    Exits global configuration mode and returns to privileged EXEC mode.

     

    Configuring a Global Modulation Profile

    This section describes how to enable or configure a global modulation profile. The global modulation profile scheme eliminates the number space restriction associated with the legacy mode allowing you to assign any number between 1 to 400 to any modulation profiles.


    Note
    When you configure a global modulation profile, all the previous modulation profiles are automatically converted. However, when you revert back to the legacy mode, all the profiles that are outside of the legacy number space range are lost.
       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 global-scheme


      Example: 
      Router(config)# cable modulation-profile global-scheme
       

      Activates the global modulation profile scheme, where you can assign any number between 1 to 400 to any modulation profile.

       
      Step 4exit


      Example: 
      Router(config)# exit
       

      Exits global configuration mode and returns to privileged EXEC mode.

       

      Creating a DOCSIS 3.0 S-CDMA Modulation Profile

      This section describes how to create a modulation profile for the DOCSIS 3.0 S-CDMA mode of operation, using one of the preconfigured modulation profiles.


      Note
      The scdma-d3 option is available only after configuring the CMTS to operate in the global modulation profile mode. This option is not available in the default mode.
         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 scdma-d3 qam-16


        Example: 
        Router(config)# cable modulation-profile 382 scdma-d3 qam-16
         

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

        • profile—Modulation profile number. The valid range is from 1 to 400. The system creates profile 381 as the default modulation profile.
        • scdma-d3—Configures the upstream only for DOCSIS 3.0 S-CDMA modulation profiles.
        • qam-16—Default 16-QAM profile.
         
        Step 4exit


        Example: 
        Router(config)# exit
         

        Exits global configuration mode and returns to privileged EXEC 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.

           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 {slot/port | slot/subslot/port}


          Example: 
          Router(config)# interface cable 5/0/0
           

          Enters interface configuration mode for the indicated cable downstream interface.

          • On the Cisco uBR7246VXR router, the valid values are:
            • slot—3 to 6
            • port—0 or 1 (depending on the cable interface)
          • On the Cisco uBR7225VXR router, the valid values are:
            • slot—1 and 2
            • port—0 or 1 (depending on the cable interface)
          • On the Cisco uBR10012 router, the valid values are:
            • slot—5 to 8
            • subslot—0 or 1
            • port—0 to 4 (depending on the cable interface)
           
          Step 4cable upstream n docsis-mode {atdma | scdma | scdma-d3 | tdma | tdma-atdma}


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

          Configures the upstream for the desired DOCSIS mode of operation:

          • n —Upstream port number. Valid values are 0 to 3 by default, but can be increased to a maximum of 7 using the cable upstream max-ports command.
          • atdma—Configures the upstream only for DOCSIS 2.0 A-TDMA modulation profiles.
          • scdma—Configures the upstream only for DOCSIS 2.0 S-CDMA modulation profiles.
          • scdma-d3—Configures the upstream only for DOCSIS 3.0 S-CDMA modulation profiles.
          • tdma—Configures the upstream only for DOCSIS 1.X TDMA modulation profiles.
          • tdma-atdma—Configures the upstream for both, A-TDMA, and TDMA operations (mixed mode).
          Note    The scdma-d3 mode is available only when the global modulation profile is used.

           
          Step 5cable upstreamn n modulation-profile profile [profile2] [profile3]


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

          Assigns the particular modulation profile to this upstream.

          • profile—Modulation profile used on this upstream. The valid range for the profile parameter depends on the current DOCSIS mode:
            • If the upstream is configured for DOCSIS 2.0 S-CDMA, the valid range is from 321 to 330.
            • If the upstream is configured for DOCSIS 3.0 S-CDMA mode, the valid range is from 1 to 400.
          • profile2 —(Optional) 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 than the primary profile to cope with the noise.)
          • profile3 —(Optional) Tertiary modulation profile that the interface uses when noise on the upstream increases to the point that the secondary modulation profile can no longer be used.
          Note   

          The tertiary modulation profile is available only for the basic dynamic modulation. You cannot use the tertiary modulation profile when a spectrum group is defined for the upstream.

          Note   

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

           
          Step 6cable upstream n active-codes active-codes


          Example: 
          Router(config-if)# cable upstream 0 active-codes 64
           

          (Optional) Configures the number of active codes on an upstream channel.

          • active-codes —Number of active codes. The valid values range from 64 to 128. The active-codes have a default value of 112, when ingress noise cancellation is enabled; and a default value of 128, when ingress noise cancellation is disabled.
           
          Step 7cable upstream n channel-width first-choice-width


          Example: 
          Router(config-if)# cable upstream 0 channel-width 3200000
           

          (Optional) Specifies an upstream channel width for an upstream port.

          • first-choice-width— Upstream channel width in hertz (Hz) . For valid values refer to the cable upstream channel-width command.
           
          Step 8cable upstream n codes-per-minislot minislot-code


          Example: 
          Router(config-if)# cable upstream 0 codes-per-minislot 8
           

          (Optional) Specifies the number of codes-per-minislot allowed on an upstream channel.

          • minislot-code—Number of codes-per-minislot. The valid values range from 2 to 32.
           
          Step 9cable upstream n max-codes-per-subframe subframe-codes


          Example: 
          Router(config-if)# cable upstream 0 max-codes-per-subframe 128
           

          (Optional) Specifies the upper limit that overrides the maximum value of codes-per-subframe defined in the individual modulation profile setting for an upstream channel.

          • subframe-codes—Number of codes-per-subframe. The valid values range from 1 to 128, with a default value of 2.
           
          Step 10cable upstream n spreading-interval spreading-interval


          Example: 
          Router(config-if)# cable upstream 0 spreading-interval 32
           

          (Optional) Specifies the spreading interval for S-CDMA channels on an upstream channel.

          • spreading-interval—Spreading interval for S-CDMA channels. The valid values range from 1 to 32, with a default value of 16.
           
          Step 11cable upstream n equalization-coefficient


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

          (Optional) Enables the use of a DOCSIS preequalization coefficient on an upstream.

           
          Step 12cable upstream n ingress-noise-cancellation interval


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

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

          • interval—Sample interval. The valid range is from 10 to 3000 milliseconds, with a default value of 200 milliseconds.
          Note   

          The ingress noise cancellation has to be disabled to use a default value of 128 for active-codes. When ingress noise cancellation is enabled, the active-codes has a default value of 112.

          Note   

          Repeat Step 3 through Step 12 for each cable interface and upstream to be configured.

           
          Step 13end


          Example: 
          Router(config-if)# end
           

          Exits interface configuration mode and returns to privileged EXEC mode.

           

          Configuring the Logical Channel Support

          This section describes how to configure logical channels for the Cisco uBR10-MC5X20H and Cisco UBR-MC20X20V cable interface line cards.

             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 {slot/port | slot/subslot/port}


            Example: 
            Router(config)# interface cable 5/0/0
             

            Enters interface configuration mode for the indicated cable downstream interface.

            • On the Cisco uBR7246VXR router, the valid values are:
              • slot—3 to 6
              • port—0 or 1 (depending on the cable interface)
            • On the Cisco uBR7225VXR router, the valid values are:
              • slot—1 and 2
              • port—0 or 1 (depending on the cable interface)
            • On the Cisco uBR10012 router, the valid values are:
              • slot—5 to 8
              • subslot—0 or 1
              • port—0 to 4 (depending on the cable interface)
             
            Step 4cable upstream n max-logical-chans num-of-logical-channels


            Example: 
            Router(config-if)# cable upstream 0 max-logical-chans 2
             

            Creates the specified number of logical channels per port on an upstream channel.

            • n—Upstream port. Valid values start with 0 for the first upstream port on the cable interface line card, but can be increased to a maximum of 7.
            • num-of-logical-channels—Number of logical channels per port.
             
            Step 5end


            Example: 
            Router(config-if)# end
             

            Exits interface configuration mode and returns to privileged EXEC mode.

             

            Monitoring the S-CDMA and Logical Channel Support

            To monitor the S-CDMA and Logical Channel Support feature, use the following procedures:

            Displaying Modulation Profiles

            To display the modulation profiles that are currently defined on the CMTS, use the show running-config command as shown in the example: 

            Router# show running-config | begin cable modulation-profile
 
cable modulation-profile global-scheme
cable modulation-profile 222 atdma request 0 16 0 22 qpsk scrambler 152 no-diff8
cable modulation-profile 222 atdma initial 5 34 0 48 qpsk scrambler 152 no-diff8
cable modulation-profile 222 atdma station 5 34 0 48 qpsk scrambler 152 no-diff8
cable modulation-profile 222 atdma a-short 6 76 6 22 64qam scrambler 152 no-dif8
cable modulation-profile 222 atdma a-long 9 232 0 22 64qam scrambler 152 no-dif8
cable modulation-profile 222 atdma a-ugs 9 232 0 22 64qam scrambler 152 no-diff8
cable modulation-profile 223 atdma request 0 16 0 22 qpsk scrambler 152 no-diff8
cable modulation-profile 223 atdma initial 5 34 0 48 qpsk scrambler 152 no-diff8
cable modulation-profile 223 atdma station 5 34 0 48 qpsk scrambler 152 no-diff8
cable modulation-profile 223 atdma a-short 6 76 6 22 64qam scrambler 152 no-dif8
cable modulation-profile 223 atdma a-long 14 220 0 22 64qam scrambler 152 no-di8
cable modulation-profile 223 atdma a-ugs 14 220 0 22 64qam scrambler 152 no-dif8
cable modulation-profile 400 scdma-d3 request 0 16 0 64qam scrambler 152 no-difm
cable modulation-profile 400 scdma-d3 initial 5 34 0 64qam scrambler 152 no-difm
cable modulation-profile 400 scdma-d3 station 5 34 0 64qam scrambler 152 no-difm
cable modulation-profile 400 scdma-d3 short 3 76 12 64qam scrambler 152 no-diffm
cable modulation-profile 400 scdma-d3 long 9 232 0 64qam scrambler 152 no-diff m
cable modulation-profile 400 scdma-d3 a-short 6 76 6 64qam scrambler 152 no-difm
cable modulation-profile 400 scdma-d3 a-long 9 232 0 64qam scrambler 152 no-difm
cable modulation-profile 400 scdma-d3 a-ugs 9 232 0 64qam scrambler 152 no-diffm
--More--

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

            Router# show cable modulation-profile 381
 
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
381  request qpsk  64  no   0x0  0x10 0x152  0   0     no   yes   0     qpsk0 n 
381  initial qpsk  98  no   0x5  0x22 0x152  0   0     no   yes   0     qpsk0 n 
381  station qpsk  98  no   0x5  0x22 0x152  0   0     no   yes   0     qpsk0 n 
381  short   qpsk  64  no   0x3  0x4C 0x152  12  0     yes  yes   0     qpsk0 n 
381  long    qpsk  64  no   0x9  0xE8 0x152  0   0     yes  yes   0     qpsk0 n 
381  a-short 64qam 64  no   0x6  0x4C 0x152  6   0     yes  yes   0     qpsk1 n 
381  a-long  64qam 64  no   0x9  0xE8 0x152  0   0     yes  yes   0     qpsk1 n 
381  a-ugs   64qam 64  no   0x9  0xE8 0x152  0   0     yes  yes   0     qpsk1 n

            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    QoS    Frag Concat PHS Priv DS    US
                State        Sid          Prov                        Saids Sids
0014.bfbe.4fc3  offline      1     DOC1.0 DOC1.0 no   no     yes      15    16  
0014.bfbe.4f59  offline      2     DOC1.0 DOC1.0 no   no     yes      15    16  
0018.6830.2813  offline      3     DOC1.0 DOC1.0 no   no     yes      15    16  
001a.c3ff.d208  online       4     DOC2.0 DOC1.1 yes  no     yes      24    8   
0014.bfbe.4fbb  w-online     7     DOC3.0 DOC1.1 yes  yes    yes      15    16  
0014.bfbe.4f9b  w-online     8     DOC3.0 DOC1.1 yes  yes    yes      15    16  
0014.bfbe.4efd  init(t)      9     DOC1.0 DOC1.0 no   yes    yes      15    16  
0018.684a.3f46  online       10    DOC2.0 DOC1.1 yes  yes    yes      15    16  
0014.bfbe.4086  init(t)      11    DOC1.0 DOC1.0 no   yes    yes      15    16  
001a.c3ff.d53a  w-online     12    DOC3.0 DOC1.1 no   no     yes      24    8

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

            Router# show cable modem mac summary
 
                            Cable Modem Summary
                            -------------------
                          Mac Version                        QoS Provision Mode
Interface       Total   DOC3.0  DOC2.0  DOC1.1  DOC1.0   Reg/Online   DOC1.1  D0
Cable7/1/0/U0   4       0       1       0       3        1            1       0
Cable8/0/0/UB   1       1       0       0       0        1            1       0
Cable8/0/0/U0.0 2       0       1       0       1        1            1       0
Cable8/0/0/U2   1       0       1       0       0        1            1       0
Cable8/0/0/U3   1       0       1       0       0        1            1       0
Cable8/0/0/U0.1 1       0       0       0       1        0            0       0

            Displaying the Logical Channel Support

            To display the logical channels within the physical upstream port, use the show cable modem command without any options: 

            Router# show cable modem
 
                                                                             B D
MAC Address    IP Address      I/F        MAC         Prim  RxPwr  Timing Num P I
                                          State       Sid   (dBmv) Offset CPE I P
0014.bfbe.4f9b 1.60.0.6       C5/0/0/U0.0 online       1     1.00   1406   0   N N
0014.bfbe.4efd 1.60.0.2       C5/0/0/U0.1 online       637   1.00   1409   0   N N
0014.bfbe.4efa 1.60.0.3       C5/0/0/U1   online       635   1.00   1409   0   N N

            The following example shows a typical output of the show controllers cable command for a cable interface line card that is configured with multiple logical channels: 

            Router# show controllers cable 7/1/0 upstream 0
 Cable7/1/0 Upstream 0 is up
  Frequency 10.000 MHz, Channel Width 6.400 MHz, Symbol Rate 5.120 Msps
  Modulations - A-short 64-QAM, A-long 64-QAM, A-ugs 64-QAM
  This upstream is mapped to physical port 0
  Spectrum Group is overridden
  US phy MER(SNR)_estimate for good packets - 23.4731 dB
  Nominal Input Power Level 3 dBmV, Tx Timing Offset 1645
  Ranging Backoff Start 3, Ranging Backoff End 6
  US timing offset adjustment type 0, value 0 
  Ranging Insertion Interval automatic (60 ms)
  US throttling off
  Tx Backoff Start 3, Tx Backoff End 5
  Modulation Profile Group 322
  Concatenation is enabled
  Fragmentation is enabled
  part_id=0x3140, rev_id=0x03, rev2_id=0x00
  nb_agc_thr=0x0000, nb_agc_nom=0x0000
  Range Load Reg Size=0x58
  Request Load Reg Size=0x0E
  Minislot Size in number of Timebase Ticks is = 1
  Minislot Size in Symbols = 32
  Bandwidth Requests = 0x31
  Piggyback Requests = 0x0
  Invalid BW Requests= 0x0
  Minislots Requested= 0x22C
  Minislots Granted  = 0x31
  Minislot Size in Bytes = 24
  Map Advance (Dynamic) : 2465 usecs
  Map Count = 17393154
  Remote Map Counts: (none)
  UCD Count = 17875
  Remote UCD Counts: (none)
  SCDMA mode enabled
  PHY: us errors 0  us recoveries 0
  MAC PHY TSS: tss error start 0  tss error end 0
  MAC PHY Status: bcm3140 status 0  lookout status 0
  MAP/UCD Replication Instructions:

            To display the modulation profile of a single logical channel, for default and legacy cable interface line cards, use the show cable modulation command: 

            Router# show cable modulation cable 5/0/0 upstream 0
 
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
381  request qpsk  64  no   0x0  0x10 0x152  0   0     no   yes   400   qpsk0 n 
381  initial qpsk  384 no   0x5  0x22 0x152  0   0     no   yes   6     qpsk0 n 
381  station qpsk  384 no   0x5  0x22 0x152  0   0     no   yes   6     qpsk0 n 
381  short   qpsk  64  no   0x3  0x4C 0x152  12  0     yes  yes   400   qpsk0 n 
381  long    qpsk  64  no   0x9  0xE8 0x152  136 0     yes  yes   400   qpsk0 n 
381  a-short 64qam 64  no   0x6  0x4C 0x152  6   0     yes  yes   400   qpsk1 n 
381  a-long  64qam 64  no   0x9  0xE8 0x152  46  0     yes  yes   400   qpsk1 n 
381  a-ugs   64qam 64  no   0x9  0xE8 0x152  35  0     yes  yes   400   qpsk1 n

            The following example shows a typical output of the show interface cable command when multiple logical channels are configured on the indicated cable interface: 

            Router# show interface cable 7/1/0 mac-scheduler 0
 
     DOCSIS 1.1 MAC scheduler for Cable7/1/0/U0: rate 26880000
     wfq:None 
     Queue[Rng Polls] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 1
     Queue[CIR Grants] 0/256, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(7) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(6) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(5) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(4) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(3) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(2) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(1) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 0
     Queue[BE(0) Grants] 0/128, 0 drops, flows 0 fs_demand_ms 0, max 1
     Req Slots 17301958, Req/Data Slots 1440804
     Init Mtn Slots 498660, Stn Mtn Slots 28134
     Short Grant Slots 0, Long Grant Slots 0
     Adv Phy Short Grant Slots 26, Adv Phy Long Grant Slots 23
     Adv Phy UGS Grant Slots 0
     Awacs Slots 0
     Fragmentation count 0
     Fragmentation test disabled
     Avg upstream channel utilization : 0%
     Avg percent contention slots : 97%
     Avg percent initial ranging slots : 3%
     Avg percent minislots lost on late MAPs : 0%
     Sched Table Rsv-state: Grants 0, Reqpolls 0
     Sched Table Adm-State: Grants 0, Reqpolls 0, Util 0%
     UGS    : 0 SIDs, Reservation-level in bps 0
     UGS-AD : 0 SIDs, Reservation-level in bps 0
     RTPS   : 0 SIDs, Reservation-level in bps 0
     NRTPS  : 0 SIDs, Reservation-level in bps 0
     BE     : 3 SIDs, Reservation-level in bps 0
     MAP TSS: lch_state 11, init_retries 0
              late_initial_maps 0, late_ucd_maps 0
              mac-phy tss errors 0
Router#

            Configuration Examples for S-CDMA and Logical Channel Support

            This section lists the following sample configurations for the S-CDMA and Logical Channel Support feature on a Cisco CMTS router:

            Creating Modulation Profiles Examples

            This section lists sample configurations for creating the following types of upstream modulation profiles:

            Example: DOCSIS 2.0 S-CDMA Modulation Profiles

            The following sample configuration shows typical modulation profiles for the DOCSIS 2.0 S-CDMA mode of operation:

            • Profile 321 is the default profile for S-CDMA operations that is automatically created on the router for the cable interface line card.
            • Profiles 321 through 330 can be used to create S-CDMA modulation profiles.
            • Profiles 1 through 400 can be used to create S-CDMA mode modulation profiles, while using the global configuration. 
             cable modulation-profile 321 scdma request 1 16 0 qpsk scrambler 152 no-diff 64m
 cable modulation-profile 321 scdma initial 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 321 scdma station 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 321 scdma a-short 5 131 6 32qam scrambler 152 no-diff m
 cable modulation-profile 321 scdma a-long 5 131 0 32qam scrambler 152 no-diff 6m
 cable modulation-profile 321 scdma a-ugs 9 232 0 64qam scrambler 152 no-diff 64m
 cable modulation-profile 322 scdma request 0 16 0 qpsk scrambler 152 no-diff 64m
 cable modulation-profile 322 scdma initial 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 322 scdma station 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 322 scdma a-short 6 76 6 64qam scrambler 152 no-diff 6m
 cable modulation-profile 322 scdma a-long 9 232 0 64qam scrambler 152 no-diff 6m
 cable modulation-profile 322 scdma a-ugs 9 232 0 64qam scrambler 152 no-diff 64m
 cable modulation-profile 333 scdma request 0 16 0 qpsk scrambler 152 no-diff 64m
 cable modulation-profile 333 scdma initial 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 333 scdma station 5 34 0 qpsk scrambler 152 no-diff 98m
 --More--

            Example: Global Modulation Profiles

            The following sample configuration shows typical modulation profiles for the global mode of operation. Profiles 1 through 400 can be used to create any modulation profile in global modulation profile mode. 

             cable modulation-profile global-scheme
 cable modulation-profile 222 atdma request 0 16 0 22 qpsk scrambler 152 no-diff8
 cable modulation-profile 222 atdma initial 5 34 0 48 qpsk scrambler 152 no-diff8
 cable modulation-profile 222 atdma station 5 34 0 48 qpsk scrambler 152 no-diff8
 cable modulation-profile 222 atdma a-short 6 76 6 22 64qam scrambler 152 no-dif8
 cable modulation-profile 222 atdma a-long 9 232 0 22 64qam scrambler 152 no-dif8
 cable modulation-profile 222 atdma a-ugs 9 232 0 22 64qam scrambler 152 no-diff8
 cable modulation-profile 223 atdma request 0 16 0 22 qpsk scrambler 152 no-diff8
 cable modulation-profile 223 atdma initial 5 34 0 48 qpsk scrambler 152 no-diff8
 cable modulation-profile 223 atdma station 5 34 0 48 qpsk scrambler 152 no-diff8
 cable modulation-profile 223 atdma a-short 6 76 6 22 64qam scrambler 152 no-dif8
 cable modulation-profile 223 atdma a-long 14 220 0 22 64qam scrambler 152 no-di8
 cable modulation-profile 223 atdma a-ugs 14 220 0 22 64qam scrambler 152 no-dif8
 cable modulation-profile 321 scdma request 1 16 0 qpsk scrambler 152 no-diff 64m
 cable modulation-profile 321 scdma initial 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 321 scdma station 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 321 scdma a-short 5 131 6 32qam scrambler 152 no-diff m
 cable modulation-profile 321 scdma a-long 5 131 0 32qam scrambler 152 no-diff 6m
 cable modulation-profile 321 scdma a-ugs 9 232 0 64qam scrambler 152 no-diff 64m
 cable modulation-profile 322 scdma request 0 16 0 qpsk scrambler 152 no-diff 64m
 cable modulation-profile 322 scdma initial 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 322 scdma station 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 322 scdma a-short 6 76 6 64qam scrambler 152 no-diff 6m
 cable modulation-profile 322 scdma a-long 9 232 0 64qam scrambler 152 no-diff 6m
 cable modulation-profile 322 scdma a-ugs 9 232 0 64qam scrambler 152 no-diff 64m
 cable modulation-profile 333 scdma request 0 16 0 qpsk scrambler 152 no-diff 64m
 cable modulation-profile 333 scdma initial 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 333 scdma station 5 34 0 qpsk scrambler 152 no-diff 98m
 cable modulation-profile 333 scdma a-short 6 76 6 64qam scrambler 152 no-diff 6m
 cable modulation-profile 333 scdma a-long 9 232 0 64qam scrambler 152 no-diff 6m
 cable modulation-profile 333 scdma a-ugs 9 232 0 64qam scrambler 152 no-diff 64m
 cable modulation-profile 400 scdma-d3 request 0 16 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 initial 5 34 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 station 5 34 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 short 3 76 12 64qam scrambler 152 no-diffm
 cable modulation-profile 400 scdma-d3 long 9 232 0 64qam scrambler 152 no-diff m
 cable modulation-profile 400 scdma-d3 a-short 6 76 6 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 a-long 9 232 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 a-ugs 9 232 0 64qam scrambler 152 no-diffm
 cable service class 1 name def_sclass
 --More--

            Example: DOCSIS 3.0 S-CDMA Modulation Profiles

            The following sample configuration shows typical modulation profiles for the DOCSIS 3.0 S-CDMA mode of operation:

            • Profile 381 is the default profile for DOCSIS 3.0 S-CDMA mode operations that is automatically created on the router.
            • Profiles 1 through 400 can be used to create DOCSIS 3.0 S-CDMA mode modulation profiles, while using the global configuration. 
             cable modulation-profile 381 scdma-d3 request 0 16 0 64qam scrambler 152 no-difm 
 cable modulation-profile 381 scdma-d3 initial 5 34 0 64qam scrambler 152 no-difm
 cable modulation-profile 381 scdma-d3 station 5 34 0 64qam scrambler 152 no-difm
 cable modulation-profile 381 scdma-d3 short 3 76 12 64qam scrambler 152 no-diffm
 cable modulation-profile 381 scdma-d3 long 9 232 0 64qam scrambler 152 no-diff m
 cable modulation-profile 381 scdma-d3 a-short 6 76 6 64qam scrambler 152 no-difm
 cable modulation-profile 381 scdma-d3 a-long 9 232 0 64qam scrambler 152 no-difm
 cable modulation-profile 381 scdma-d3 a-ugs 9 232 0 64qam scrambler 152 no-diffm
 cable modulation-profile 400 scdma-d3 request 0 16 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 initial 5 34 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 station 5 34 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 short 3 76 12 64qam scrambler 152 no-diffm
 cable modulation-profile 400 scdma-d3 long 9 232 0 64qam scrambler 152 no-diff m
 cable modulation-profile 400 scdma-d3 a-short 6 76 6 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 a-long 9 232 0 64qam scrambler 152 no-difm
 cable modulation-profile 400 scdma-d3 a-ugs 9 232 0 64qam scrambler 152 no-diffm
  --More--

            Assigning Modulation Profiles to Upstreams Examples

            This section lists sample configurations for assigning the following types of modulation profiles to upstreams:

            Example: Assigning DOCSIS 2.0 S-CDMA Modulation Profiles

            The following sample configuration shows DOCSIS 2.0 S-CDMA modulation profiles being assigned to the upstreams on two cable interfaces. The default S-CDMA modulation profile (profile 321) is assigned to the upstreams on cable interface 7/1/0, and custom modulation profile 322 is assigned to the upstreams on cable interface 7/1/1. 

            interface Cable7/1/0
 cable init-channel-timeout 160
 no cable mtc-mode
 cable cm-status enable 1-5
 no cable packet-cache
 cable bundle 1
 cable downstream channel-id 13
 cable downstream annex B
 cable downstream modulation 256qam
 cable downstream interleave-depth 32
 cable downstream frequency 459000000
 no cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream ranging-poll interval 25000
 cable upstream 0 connector 0
 cable upstream 0 frequency 10000000
 cable upstream 0 channel-width 3200000
 cable upstream 0 power-level 3
 cable upstream 0 docsis-mode scdma
 cable upstream 0 spreading-interval 16
 cable upstream 0 codes-per-minislot 4
 cable upstream 0 active-codes 112
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 321
 no cable upstream 0 shutdown
interface Cable7/1/1
 shutdown
 cable cm-status enable 1-5
 no cable packet-cache
 cable downstream channel-id 180
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream 0 connector 4
 cable upstream 0 frequency 10000000
 cable upstream 0 channel-width 1600000 
 cable upstream 0 docsis-mode scdma
 cable upstream 0 spreading-interval 16
 cable upstream 0 codes-per-minislot 4
 cable upstream 0 active-codes 112
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 322
 no cable upstream 3 shutdown
!

            Example: Assigning Global Modulation Profiles

            The following sample configuration shows user-defined DOCSIS 3.0 S-CDMA modulation profiles being assigned to the upstreams on two cable interfaces. Only the first upstream on cable interface 7/1/0 is enabled for A-TDMA mode and assigned an A-TDMA profile. The other two upstreams on cable interface (7/1/1 and 7/1/2) are enabled for custom-defined DOCSIS 3.0 S-CDMA modulation profiles. 

            interface Cable7/1/0
 cable init-channel-timeout 160
 no cable mtc-mode
 cable cm-status enable 1-5
 no cable packet-cache
 cable bundle 1
 cable downstream channel-id 13
 cable downstream annex B
 cable downstream modulation 256qam
 cable downstream interleave-depth 32
 cable downstream frequency 459000000
 no cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream ranging-poll interval 25000
 cable upstream 0 connector 0
 cable upstream 0 frequency 10000000
 cable upstream 0 channel-width 3200000
 cable upstream 0 ingress-noise-cancellation 112
 cable upstream 0 power-level 3
 cable upstream 0 docsis-mode atdma
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 221
 cable upstream 0 equalization-coefficient
 no cable upstream 0 shutdown
!
interface Cable7/1/1
 shutdown
 cable cm-status enable 1-5
 no cable packet-cache
 cable downstream channel-id 180
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream 0 connector 4
 cable upstream 0 frequency 10000000
 cable upstream 0 channel-width 1600000
 cable upstream 0 docsis-mode tdma
 cable upstream 0 minislot-size 4
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 21
 no cable upstream 0 shutdown
 cable upstream 1 connector 5
 cable upstream 1 frequency 18000000
 cable upstream 1 channel-width 3200000
 cable upstream 1 ingress-noise-cancellation 112
 cable upstream 1 docsis-mode scdma-d3
 cable upstream 1 spreading-interval 16
 cable upstream 1 codes-per-minislot 4
 cable upstream 1 active-codes 64
 cable upstream 1 max-codes-per-subframe 128
 cable upstream 1 range-backoff 3 6
 cable upstream 1 modulation-profile 382
 cable upstream 1 equalization-coefficient
 no cable upstream 1 shutdown
 cable upstream 2 connector 6
 cable upstream 2 frequency 25000000
 cable upstream 2 channel-width 1600000 1600000
 cable upstream 2 docsis-mode tdma
 cable upstream 2 minislot-size 4
 cable upstream 2 range-backoff 3 6
 cable upstream 2 modulation-profile 21
 no cable upstream 2 shutdown
 cable upstream 3 connector 7
 cable upstream 3 frequency 32000000
 cable upstream 3 channel-width 1600000 1600000
 cable upstream 3 docsis-mode tdma
 cable upstream 3 minislot-size 4
 cable upstream 3 range-backoff 3 6
 cable upstream 3 modulation-profile 21
 no cable upstream 3 shutdown
! 
interface Cable7/1/2
 shutdown
 cable cm-status enable 1-5
 no cable packet-cache
 cable downstream channel-id 181
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream 0 connector 8
 cable upstream 0 frequency 20000000
 cable upstream 0 channel-width 1600000
 cable upstream 0 docsis-mode tdma
 cable upstream 0 minislot-size 4
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 21
 no cable upstream 0 shutdown
 cable upstream 1 connector 9
 cable upstream 1 channel-width 1600000
 cable upstream 1 docsis-mode tdma
 cable upstream 1 minislot-size 4
 cable upstream 1 range-backoff 3 6
 cable upstream 1 modulation-profile 21
 no cable upstream 1 shutdown
 cable upstream 2 connector 10
 cable upstream 2 channel-width 3200000
 cable upstream 2 ingress-noise-cancellation 112
 cable upstream 2 docsis-mode scdma-d3
 cable upstream 2 spreading-interval 16
 cable upstream 2 codes-per-minislot 4
 cable upstream 2 active-codes 64
 cable upstream 2 max-codes-per-subframe 128
 cable upstream 2 range-backoff 3 6
 cable upstream 2 modulation-profile 382
 cable upstream 2 equalization-coefficient
!

            Example: Assigning DOCSIS 3.0 S-CDMA Modulation Profiles

            The following sample configuration shows DOCSIS 3.0 S-CDMA modulation profiles being assigned to the upstreams on two cable interfaces. The default DOCSIS 3.0 S-CDMA modulation profile (profile 381) is assigned to the upstreams on cable interface 7/1/0, and custom modulation profile 382 is assigned to the upstreams on cable interface 7/1/1. 

            interface Cable7/1/0
 cable init-channel-timeout 160
 no cable mtc-mode
 cable cm-status enable 1-5
 no cable packet-cache
 cable bundle 1
 cable downstream channel-id 13
 cable downstream annex B
 cable downstream modulation 256qam
 cable downstream interleave-depth 32
 cable downstream frequency 459000000
 no cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream ranging-poll interval 25000
 cable upstream 0 connector 0
 cable upstream 0 frequency 10000000
 cable upstream 0 channel-width 3200000
 cable upstream 0 power-level 3
 cable upstream 0 docsis-mode scdma-d3
 cable upstream 0 spreading-interval 16
 cable upstream 0 codes-per-minislot 4
 cable upstream 0 active-codes 64
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 381
 cable upstream 0 equalization-coefficient
 no cable upstream 0 shutdown
!
interface Cable7/1/1
 shutdown
 cable cm-status enable 1-5
 no cable packet-cache
 cable downstream channel-id 180
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream ranging-poll interval 25000
 cable upstream 0 connector 0
 cable upstream 0 frequency 10000000
 cable upstream 0 channel-width 3200000
 cable upstream 0 power-level 3
 cable upstream 0 docsis-mode scdma-d3
 cable upstream 0 spreading-interval 16
 cable upstream 0 codes-per-minislot 4
 cable upstream 0 active-codes 64
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 382
 cable upstream 0 equalization-coefficient
 no cable upstream 0 shutdown

            Example: Creating Logical Channels

            The following example shows the configuration of an interface that has two of four physical ports configured to have two logical channels per physical port: 

            interface Cable5/0/0
 no cable packet-cache
 cable downstream channel-id 167
 cable downstream annex B
 cable downstream modulation 64qam
 cable downstream interleave-depth 32
 cable downstream frequency 453000000
 no cable downstream rf-shutdown
 cable upstream max-ports 4
 cable upstream 0 connector 0
 cable upstream 0 frequency 10000000
 cable upstream 0 channel-width 1600000 1600000
 cable upstream 0 max-logical-chans 2
 cable upstream 0 load-balance group 1
 cable upstream 0 0 docsis-mode atdma
 cable upstream 0 0 minislot-size 4
 cable upstream 0 0 power-adjust continue 3
 cable upstream 0 0 range-backoff 3 6
 cable upstream 0 0 modulation-profile 21
 no cable upstream 0 0 shutdown
 cable upstream 0 1 docsis-mode tdma
 cable upstream 0 1 minislot-size 2
 cable upstream 0 1 power-adjust continue 6
 cable upstream 0 1 range-backoff 3 6
 cable upstream 0 1 modulation-profile 221
 no cable upstream 0 1 shutdown
 no cable upstream 0 shutdown
 cable upstream 1 connector 1
 cable upstream 1 spectrum-group 1
 cable upstream 1 channel-width 1600000 1600000
 cable upstream 1 max-logical-chans 2
 cable upstream 1 0 docsis-mode atdma
 cable upstream 1 0 minislot-size 4
 cable upstream 1 0 range-backoff 3 6
 cable upstream 1 0 modulation-profile 21
 no cable upstream 1 0 shutdown
 cable upstream 1 1 docsis-mode tdma
 cable upstream 1 1 minislot-size 2
 cable upstream 1 1 range-backoff 3 6
 cable upstream 1 1 modulation-profile 221
 cable upstream 1 1 equalization-coefficient
 no cable upstream 1 1 shutdown
 no cable upstream 1 shutdown
 cable upstream 2 connector 2
 cable upstream 2 docsis-mode scdma
 cable upstream 2 frequency 10000000
 cable upstream 2 channel-width 1600000 1600000
 cable upstream 2 range-backoff 3 6
 cable upstream 2 modulation-profile 322
 no cable upstream 2 shutdown
 cable upstream 3 connector 3 
 cable upstream 3 docsis-mode scdma
 cable upstream 3 spectrum-group 2
 cable upstream 3 channel-width 1600000 1600000
 cable upstream 3 range-backoff 3 6
 cable upstream 3 modulation-profile 321
 no cable upstream 3 shutdown
end

            Additional References

            The following sections provide references related to the S-CDMA and Logical Channel Support feature.

            Related Documents

            Related Topic

            Document Title

            CMTS commands

            Cisco IOS CMTS Cable Command Reference

            Spectrum Management and Advanced Spectrum Management

            Spectrum Management and Advanced Spectrum Management for the Cisco CMTS Routers

            Load Balancing and Dynamic Channel Change

            Load Balancing and Dynamic Channel Change on the Cisco CMTS Routers

            Standards and RFCs

            Standards

            Title

            CM-SP-SECv3.0-I09-090121

            Data-over-Cable Service Interface Specifications Security Specification, version 3.0

            CM-SP-CMCIv3.0-I01-080320

            Data-over-Cable Service Interface Specifications Cable Modem to Customer Premise Equipment Interface Specification, version 3.0

            CM-SP-PHYv3.0-I08-090121

            Data-over-Cable Service Interface Specifications Physical Layer Specification, version 3.0

            CM-SP-MULPIv3.0-I09-090121

            Data-over-Cable Service Interface Specifications MAC and Upper Layer Protocols Interface Specification, version 3.0

            CM-SP-OSSIv3.0-I08-090121

            Data-over-Cable Service Interface Specifications Operations Support System Interface Specification, version 3.0

            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
            • IF-MIB
            • DOCS-IF-MIB (RFC 2670)

            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 S-CDMA and Logical Channel Support on 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 4 Feature Information for S-CDMA and Logical Channel Support on the Cisco CMTS Routers

            Feature Name

            Releases

            Feature Information

            S-CDMA and Logical Channel Support on the Cisco CMTS Routers

            12.2(33)SCC

            This feature was introduced for the Cisco uBR10012 router.

            The following commands are new or modified:

            • cable upstream active-codes
            • cable upstream channel-width
            • cable upstream codes-per-minislot
            • cable upstream docsis-mode
            • cable upstream max-codes-per-subframe
            • cable upstream max-interleave-step
            • cable upstream max-logical-chans
            • cable upstream spreading-interval
            • cable upstream modulation-profile
            • cable upstream modulation-profile global-scheme
            • show controllers cable
            • show interface cable mac-scheduler

            S-CDMA and Logical Channel Support on the Cisco CMTS Routers

            12.2(33)SCD

            Support was added for the Cisco uBR7246VXR and Cisco uBR7225VXR routers.