Cisco Broadband Cable Command Reference Guide

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cable upstream channel-width cable upstream channel-width Syntax Description Defaults 1,600,000 Hz 2-208 Cisco Broadband Cable Command Reference Guide Chapter 2 Cisco Cable Modem Termination System Commands To specify an upstream channel width for an upstream port, use the cable upstream channel-width command in cable interface configuration mode. To set the channel width back to the default setting of 1,600,000 Hz, use the no form of this command. cable upstream n channel-width first-choice-width [last-choice-width] no cable upstream n channel-width Command Modes Interface configuration (cable interface only) Command History n Specifies the upstream port number. Valid values start with 0 for the first upstream port on the cable interface line card. first-choice-width Specifies upstream channel width in hertz (Hz). Valid values are: 200,000 (160,000 symbols/sec), 400,000 (320,000 symbols/sec), 800,000 (640,000 symbols/sec), 1600,000 (1,280,000 symbols/sec), and 3,200,000 (2,560,000 symbols/sec). last-choice-width (Cisco uBR-MC16S only) The upstream channel width in hertz. The valid values are the same as those for the first-choice-width parameter. Use this parameter with the Cisco uBR-MC16S cable interface line card to enable symbol rate management algorithms. The symbol rate automatically steps up from the first-choice-width value to the highest value until a stable channel is established. Usage Guidelines The last-choice-width parameter is supported only by the Cisco uBR-MC16S cable interface line card. When the Cisco uBR-MC16S card is installed, the system attempts to increase the channel width from the smallest channel width value to the largest channel width value, one step at a time. Note To specify only one channel width for the Cisco uBR-MC16S card, specify the same value for both the first-choice-width and last-choice-width parameters. For example: cable upstream 0 channel-width 800000 800000 Note The last-choice-width argument is applicable only to the Cisco uBR-MC16S card. Release Modification 11.3(5)NA This command was introduced. 12.0(4)XI The last-choice-width argument was added. OL-1581-05
Chapter 2 Cisco Cable Modem Termination System Commands OL-1581-05 cable upstream channel-width When using this command to change channel-widths for an upstream interface on the Cisco uBR-MC5X20S cable interface line card, some DOCSIS 1.1 CMs can go offline if you do not also change the minislot size to the corresponding value. See the following examples for the correct channel-width and minislot pairings: router(config-if)# cable upstream 0 channel-width 3200000 router(config-if)# cable upstream 0 minislot 4 router(config-if)# cable upstream 0 channel-width 1600000 router(config-if)# cable upstream 0 minislot 8 router(config-if)# cable upstream 0 channel-width 800000 router(config-if)# cable upstream 0 minislot 16 router(config-if)# cable upstream 0 channel-width 400000 router(config-if)# cable upstream 0 minislot 32 router(config-if)# cable upstream 0 channel-width 200000 router(config-if)# cable upstream 0 minislot 64 This limitation does not affect DOCSIS 1.1-compliant CMs. Examples The following example configures upstream port 2 on a Cisco uBR-MCXXC card with a channel width of 200,000 Hz (which is equivalent to a symbol rate of 160 kilosymbols/second): router(config-if)# cable upstream 2 channel-width 200000 The following example configures upstream port 2 on a Cisco uBR-MC16S card with a channel width of 200,000 Hz (which is equivalent to a symbol rate of 160 kilosymbols/second): router(config-if)# cable upstream 2 channel-width 200000 200000 The following example configures upstream port 3 to step from a channel width of 1,600,000 Hz to a channel width of 3,200,000 Hz in increments of 200,000 Hz: router(config-if)# cable upstream 3 channel-width 1600000 3200000 Related Commands Command Description cable upstream fec-strength cable upstream hopping blind cable upstream modulation Overrides the FEC setting specified in the modulation profile for an upstream channel. Disables optimum frequency hopping on the Cisco uBR-MC16S cable interface line card. Overrides modulation types specified in the modulation profile for the specified upstream channel. Cisco Broadband Cable Command Reference Guide 2-209
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Preface OL-1581-05 Cisco Broadband
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Cisco Broadband Cable Command Reference Guide

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