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Spectrum Management Overview

12.0(7)XR2

In this example, ten combiner groups are served with frequency hop tables from three spectrum

groups:

Cable3/0

DS +-----+ Upconverter +----- laser group 1

U0 +----- combiner group A

U1 +----- combiner group B

U2 +------combiner group C

U3 +------combiner group C

U4 +----- combiner group D

U5 +------combiner group E

Cable4/0

DS +-----+ Upconverter +----- laser group 2

U0 +------combiner group E

U1 +----- combiner group F

U2 +----- combiner group G

U3 +----- combiner group H

U4 +----- combiner group I

U5 +----- combiner group J

The laser group term refers to the set of ﬁber nodes that share the same downstream signal. An

optical splitter is often used to create individual feeds-per-node.

In the downstream direction, two 6 MHz channel slots are assigned. All ﬁber nodes in combiner

groups A-E should have a channel slot containing the downstream signal from Cable3/0. Combiner

groups A-E are said to belong to “laser group 1.”

All ﬁber nodes in combiner groups E-J should have a channel slot containing the downstream signal

from Cable4/0. Combiner groups E-J are said to belong to “laser group 2.”

Because combiner group E belongs to two laser groups, there should be two different downstream

channel slots for Cable3/0 and Cable4/0.

Assuming that all combiner groups use the frequency band from 20 to 26 MHz, the following

conﬁguration enables spectrum management for all upstream ports:

cable spectrum-group 1 band 20000000 26000000

cable spectrum-group 2 shared

cable spectrum-group 2 band 20000000 26000000

cable spectrum-group 3 shared

cable spectrum-group 3 band 20000000 26000000

interface Cable3/0

cable spectrum-group 1

cable upstream 2 spectrum-group 2

cable upstream 3 spectrum-group 2

cable upstream 5 spectrum-group 3

interface Cable4/0

cable spectrum-group 1

cable upstream 0 spectrum-group 3

A description of the spectrum groups 1 through 3 follows:

1 2 3 4 5 6 7 8 9 10 11 ... 33 34

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