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Two-Way Cable

Cisco uBR7200 Series MC16S Cable Modem Card Spectrum Management 11

“Shared” indicates that upstream ports must share the same spectrum, and, therefore, must never be

set for overlapping carriers.

Note By default, upstream may overlap for all ports in the same spectrum group if this option is not

conﬁgured.

[no] cable spectrum-group

hop period

period-sec

[no] cable spectrum-group

hop threshold

thres-pcnt

hop

Indicates that a frequency hop parameter is to be conﬁgured for a period.

period-sec

Valid range is 1 to 3600 seconds. This parameter limits the frequency hop rate to a conﬁgured period

value in seconds. The conﬁgured value may be returned to its default of 300 seconds using the no

keyword.

thres-pcnt

Valid range is 0 to 100 percent.

Interface Conﬁguration

Specify upstream channel width in Hz. Valid values are 200000, 400000, 800000, 1600000, and

3200000 based on the cable modem card used. The corresponding symbol rate is 160000, 320000,

640000, 1280000, and 2560000 symbols/sec. A default value of 1600000 Hz (1280000 symbols/sec)

is conﬁgured by the no keyword.

cable upstream

channel-width

width

[no] cable upstream

channel-width

width

The channel width set by this command determines the amount of spectrum needed during

frequency assignment.

[no] cable upstream

port

shutdown

shutdown (Default)

Disables the upstream port. In this mode, downstream UCD and MAP messages for the upstream

channel are disabled which inhibits the upstream transmitters on the cable modems.

Note Shutting down the interface does not prevent frequency assignment.

no...shutdown

Enables the upstream port. The operator must conﬁgure this option to enable data trafﬁc.

[no] cable spectrum-group

groupnum

no...spectrum-group

(Default) Disable frequency agility.

groupnum

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 33 34

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