Cisco Cisco IOS Software Release 12.1(3)EC

The following table describes the fields shown in the show cable modulation-profile display.

Mo

Modulation profile group number. A modulation profile group is the 
set of burst profiles that define upstream transmit characteristics for 
the various types of upstream transmission classes.

IUC

Internal usage code. Each upstream transmit burst belongs to a class 
which is given a number called the IUC. Bandwidth maps messages 
by IUC codes used to allocate upstream time slots. The following 
types are currently defined:

Request—bandwidth request slot

Initial maintenance—initial link registration contention slot

Station maintenance—link keep-alive slot

Short data grant—short data burst slot

Long data grant—long data burst slot

Type

Modulation type. 

Preamb length

Preamble length. 

Diff enco

Differential encoding enabled (yes) or not enabled (no).

FEC T bytes

Number of bytes that can be corrected for each FEC code word.

FEC CW size

Size, in bytes, of the FEC codeword.

Scrambl seed

Scrambler seed value in hex format.

Max B size

Maximum burst size.

Guard time size

Time between successive bursts measured in symbols.

Last CW short

Handling of FEC for shortened last code word.

Scrambl

Scrambler enabled (yes) or not enabled (no).

Preamb offset

The bits to be used for the preamble value.

Configures a spectrum group to use a specified 
frequency.