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Chapter 9: Upstream Cable Access Modules (UCAMs)

STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

1. The default modulation profile ID is 2. Use one of the following commands to create a new one modulation profile:

a. The command below creates a modulation profile that contains all of the needed IUCs with the default values,

which are recommended.

qam-32 | qam-64>

b. The following command creates a new modulation profile if the ID number specified has not been used. This new

modulation profile contains only the IUC value specified. Before this modulation profile can be used, all of the

necessary IUCs must be added to it.

configure cable modulation-profile <id> <iuc <type>>

Where: id= The number of the modulation-profile

type = IUC Type (see following note)

Note: Default values for the various modulation profile parameters may change according to the IUC selected. See

Modulation Profile Values (page 300) for a complete listing.

Each of the two commands above can be used to modify an existing modulation profile. The first command changes all

of the values of the modulation profile to the default values. The second command changes only the values that are

specified in the command line.

2. Use the following command to apply an existing modulation profile to an upstream port. Do not enter a range of ports;

the command must be repeated for each upstream port.

configure interface cable-upstream <slot>/<port> cable modulation-profile <id>

3. Verify the parameters of the new (modified) modulation profile:

show cable modulation-profile <id>

The system response is similar to the following output:

Modulation profile 2

Interval Chan Mod Pre Dif FEC FEC Scr Max Guar L Scr ---Atdma--- Prea -----Scdma-----

Usage Type Type Len Enc CW amb Bur Time C amb Int Int mble TCM Int Sp Sub

Code En Len Seed Siz Size S En Depth Block Type En Size En Cod

------------------------------------------------------------------------------------------------

1 request tdma qpsk 56 F 0 16 338 0 8 F T - - - - - - -

3 initial tdma qk 640 F 5 34 338 0 48 F T - - - - - - -

4 station tdma qppssk 384 F 5 34 338 0 48 F T - - - - - - -

5 short tdma qpsk 84 F 6 78 338 45 8 T T - - - - - - -

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