Cisco Cisco IOS Software Release 12.1(3)EC

Enter the show running-config command at the Router# prompt to check the value of the settings you 
have entered.

Router# show running-config

To review changes you make to the configuration, use the show startup-config command to display the 
information stored in NVRAM.

Use the show cable modulation-profile privileged EXEC command to display modulation profile 
group information.

Router# show cable modulation-profile [profile] [iuc-code] 

profile—(Optional) Profile number. Valid values are from 1 to 8.

iuc-code—(Optional) Internal usage code. 

Valid options are:

initial—initial ranging burst

long— long grant burst

request—request burst

short—short grant burst

station— station ranging burst

The Cisco uBR7200 series Cisco IOS Release 12.1(3a)EC1 has one preconfigured modulation profile 
resident in memory, which defines a typical profile for QPSK modulation. In order to use the 
Dynamic Upstream Modulation feature, a second profile must be created that is unique from the first 
profile, and typically provides a higher modulation scheme.

The following example is a modulation profile for 16QAM, in which the initial, request, and station 
maintenance messages are sent as QPSK, and the short and long data packets are sent as 16QAM. 
16QAM modulation is more bandwidth-efficient than QPSK, but QPSK is more robust than 16QAM.