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Cisco Broadband Cable Command Reference Guide
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Chapter 2 Cisco CMTS Configuration Commands
cable upstream frequency
Note
In Cisco IOS Release 12.2(15)BC2 and later releases, the allowable range of frequencies that you can
select with the
cable upstream frequency
command is determined by the configuration of the
upstream
freq-range
command.
Tip
If both a Cisco uBR-MC16E cable interface line card and a Cisco uBR-MC16C and/or a
Cisco uBR-MC16S cable interface line card are present in the chassis, a spectrum group in the 42 MHz
to 65 MHz range should not be assigned.
To configure the default upstream frequency (which is no fixed frequency), enter the
cable upstream
n
frequency
command without specifying a center frequency.
Examples
The following example shows how to configure the upstream center frequency for port 0, located in slot
6, to 5,700,000 Hz:
Router(config-if)#
cable upstream 0 frequency 5700000
Router(config-if)#
exit
Router(config)#
exit
Router#
show running-config | include frequency
cable upstream 0 frequency 5696000
Router#
Note
Cisco cable interface line cards always program the upstream’s center frequency in 16 KHz increments,
and this is the frequency displayed by the lines added to the router’s configuration and by the
show
controllers cable upstream
command. For example, if you use the
cable upstream frequency
command to specify a center frequency of 27 MHz (
cable upstream x frequency 27000000
), the actual
center frequency will be 27.008 MHz, which is the next highest 16 KHz boundary. The configuration file
will therefore show the line
cable upstream 0 frequency 27008000
.
Table 2-11
Allowable Frequency Range for the cable upstream frequency Command
Frequency Range
Supported Cable Interfaces
Minimum Cisco IOS Releases
5 to 42 MHz
All supported cable interfaces
All releases supported for the
Cisco CMTS
5 to 55 MHz
Cisco uBR-MC16U/X,
Cisco uBR-MC28U/X,
Cisco uBR-MC5X20U
Cisco IOS Release 12.2(15)BC2
5 to 65 MHz
Cisco uBR-MC16E,
Cisco uBR-MC16U/X,
Cisco uBR-MC28U/X,
Cisco uBR-MC5X20U,
Cisco uBR7111E and
Cisco uBR7114E routers
Cisco IOS Release 12.0(13)SC,
12.1(4)EC, and 12.2(4)BC1
Содержание Broadband Cable
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