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Configuring Spectrum Management on an Upstream Cable Interface

Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 25

cable upstream frequency

Enter a ﬁxed frequency of the upstream RF carrier for an upstream port. You can also select a default

that does not set a speciﬁc ﬁxed value. The valid range for a ﬁxed upstream frequency is

5,000,000 Hz to 42,000,000 Hz (5 to 40 MHz). The Cisco uBR7200 series will command the

cable modems to use this frequency as the center frequency.

Note Some cable systems cannot reliably transport frequencies near these band edges. The wider

the upstream channel (in MHz), the more difﬁculty you could have. Enter a center frequency

between 20 and 38 MHz if you have difﬁculty.

cable upstream interface number frequency frequency

no cable upstream interface number frequency frequency

Syntax Description

Default

Dynamic (no ﬁxed frequency)

Command Mode

Cable interface conﬁguration

Command History

Example

See the following example to allow the Cisco uBR7200 series to dynamically specify a center

frequency upstream interface 0:

Router(config-if)# cable upstream 0 frequency

interface number Speciﬁes the upstream interface on the cable modem card for

which you want to assign an upstream frequency.

frequency Speciﬁes the center frequency (in Hz) for the given upstream

interface. Acceptable values range from 5000000 to 42000000. If

you wish to have the Cisco uBR7200 series dynamically specify a

center frequency for the given upstream interface, you can elect

not to enter any frequency value.

Release Modiﬁcation

11.3 NA This command was introduced.

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Cisco MC16S Manual de usuario Pagina 25