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cable upstream channel-width
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. Also, in Cisco IOS Release 12.2(15)CX,
Note
Cisco IOS Release 12.2(15)BC2, and later releases, manually changing the minislot size is not needed
on the Cisco uBR-MC16U/X, Cisco uBR-MC28C, and Cisco uBR-MC28U/X cards, because these cards
automatically change the minislot size when the channel width is changed, so as to produce 32 symbols
per minislot.
PacketCable Limitations
The 200,000 Hz channel width cannot be used on upstreams that support PacketCable voice calls, or on
any upstreams that use Unsolicited Grant Service (UGS) or UGS with Activity Detection (UGS-AD)
service flows. Using this small a channel width with voice and other UGS/UGS-AD service flows results
in calls being rejected because of "DSA MULTIPLE ERRORS".
Examples
The following example shows upstream port 2 on a Cisco uBR-MCXXC card being configured 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
Router(config-if)#
The following example shows upstream port 2 on a Cisco uBR-MC16S, Cisco uBR-MC16U/X,
Cisco uBR-MC28U/X, or Cisco uBR-MC5X20S card being configured 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
Router(config-if)#
The following example shows upstream port 3 being configured 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
Router(config-if)#
The following example shows an upstream port on a Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, or
Cisco uBR-MC5X20S card being configured with a channel width of 6.4 MHz, which is supported only
in DOCSIS 2.0 A-TDMA-only mode:
Router(config-if)# cable upstream 0 channel-width 6400000
Router(config-if)#
Related Commands
Cisco Broadband Cable Command Reference Guide
2-292
Chapter 2
Cisco CMTS Configuration Commands
OL-1581-08
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