Table of Contents
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Chapter 2
Cisco CMTS Configuration Commands
8
request qpsk 64
8
initial qpsk 128
8
station qpsk 128
8
short
8
long
Router#
The above example shows the default values for the burst parameters. The main differences in the default
Note
values between 16-QAM and QPSK bursts are in the Type and Preamble Length fields.
The following example shows how to define the burst parameters for profile 2 with the following
parameters: 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.
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 reqdata 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 must create all of the bursts (request, initial, station, short and long) for this modulation profile,
using the modulation profile command. The reqdata burst is optional.
The following example shows an example of a DOCSIS 1.X/DOCSIS 2.0 mixed modulation profile:
Router# configure terminal
Router(config)# cable modulation-profile 142 request 0 16 0 8 qpsk scrambler 152 no-diff
64 fixed uw8
Router(config)# cable modulation-profile 142 initial 5 34 0 48 qpsk scrambler 152 no-diff
32 fixed uw16
Router(config)# cable modulation-profile 142 station 5 34 0 48 qpsk scrambler 152 no-diff
32 fixed uw16
Router(config)# cable modulation-profile 142 short 5 75 6 8 qpsk scrambler 152 no-diff 72
shortened uw8
Router(config)# cable modulation-profile 142 long 8 220 0 8 qpsk scrambler 152 no-diff 80
shortened uw8
Router(config)# cable modulation-profile 142 a-short qpsk0 0 18 5 99 10 8 64qam scrambler
152 no-diff 128 shortened uw8
Router(config)# cable modulation-profile 142 a-long qpsk0 0 18 15 200 0 8 64qam scrambler
152 no-diff 128 shortened uw8
Router(config)#
The following example shows an example of a DOCSIS 2.0 A-TDMA modulation profile:
Router# configure terminal
Router(config)# cable modulation-profile 242 request qpsk0 0 0 0 16 0 8 qpsk scrambler 152
no-diff 64 fixed uw8
Router(config)# cable modulation-profile 242 initial qpsk0 0 0 5 34 0 48 qpsk scrambler
152 no-diff 32 fixed uw16
Router(config)# cable modulation-profile 242 station qpsk0 0 0 5 34 0 48 qpsk scrambler
152 no-diff 32 fixed uw16
OL-1581-08
BYTES
no
0x0
no
0x5
no
0x5
qam
144
no
0x6
qam
160
no
0x8
size
size size
0x10
0x152
0
8
0x22
0x152
0
48
0x22
0x152
0
48
0x4B
0x152
6
8
0xDC
0x152
0
8
Cisco Broadband Cable Command Reference Guide
cable modulation-profile
short
no
yes
0
no
yes
0
no
yes
0
yes
yes
0
yes
yes
0
2-173
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