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Command Reference

12.0(3)T

Command History

Usage Guidelines

You can use the no form of this command to remove all modulation proﬁles except modulation

proﬁle 1. In the case of modulation proﬁle 1, the no form of this command sets all of the parameters

in a burst to default values.

Caution Changes to modulation proﬁles causes changes to the physical layer. Because changing physical

layer characteristics affects router performance and function, this task should be reserved for expert users.

Example

The following example deﬁnes the burst parameters for proﬁle 2 as follows:

The request burst is deﬁned to have 0 fec-tbytes, 16 kbytes fec-len, a burst-len of 1, a guard time of

8, a mod value of qpsk, scrambler enabled with a seed value of 152, differential encoding disabled,

a preamble length of 64 bits, a ﬁxed code word length, and 8-bit unique words for upstream unique

word length. The remaining initial, station, short, and long bursts are deﬁned in similar fashion for

proﬁle 2.

Router(config)# cable modulation-profile 2 request 0 16 1 8 qpsk scrambler 152 no-diff

64 fixed uw8

Router(config)# cable modulation-profile 2 initial 5 34 0 48 qpsk scrambler 152 no-diff

128 fixed uw16

Router(config)# cable modulation-profile 2 station 5 34 0 48 qpsk scrambler 152 no-diff

128 fixed uw16

Router(config)# cable modulation-profile 2 short 6 75 6 8 16qam scrambler 152 no-diff

144 fixed uw8

Router(config)# cable modulation-profile 2 long 8 220 0 8 16qam scrambler 152 no-diff

160 fixed uw8

Note You have to create all of the bursts (request, initial, station, short and long) for this modulation

proﬁle to use the modulation proﬁle command.

See the show cable modulation-proﬁle command for a description of the output display ﬁelds.

Related Commands

Release Modiﬁcation

11.3 NA This command was ﬁrst introduced.

Command Description

cable upstream modulation-proﬁle Assigns a modulation proﬁle to an interface.

show cable modulation-proﬁle Displays a modulation proﬁle group’s information.

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