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Chapter 2
Cisco CMTS Configuration Commands
robust-mix-low
robust-mix-mid
robust-mix-qam
iuc
preamble
rs-interleave-depth
rs-interleave-block
fec-tbytes
fec-len
burst-len
guard-t
mod
scrambler
OL-1581-08
(DOCSIS 2.0 A-TDMA mode only) Creates a default QPSK/16-QAM
modulation profile with a longer preamble that is more robust and better
able to deal with noise on the upstream than the mix-low profile.
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only) Creates a
default QPSK/32-QAM modulation profile with a longer preamble that is
more robust and better able to deal with noise on the upstream than the
mix-mid profile.
(DOCSIS 1.x/2.0 mixed mode only) Creates a default 16-QAM/64-QAM
mixed modulation profile with a longer preamble that is more robust and
better able to deal with noise on the upstream than the mix-qam profile.
Interval usage code. Valid entries depend on the mode of operation:
If the upstream is configured for DOCSIS 1.0 and DOCSIS 1.1
•
modulation profiles, the valid values are initial, long, request,
reqdata, short, or station.
If the upstream is configured for DOCSIS 1.x and DOCSIS 2.0 mixed
•
modulation profiles, the valid values are a-long, a-short, a-ugs, initial,
long, request, reqdata, short, or station.
If the upstream is configured for DOCSIS 2.0 A-TDMA modulation
•
profiles, the valid values are a-long, a-short, a-ugs, initial, long,
request, reqdata, short, or station.
The reqdata burst type is included as a placeholder for scripts that
Note
might reference it, but the DOCSIS MAC scheduler on the
Cisco CMTS does not use this type of burst.
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only, for a-long
and a-short options) Specifies the preamble format. Valid values are qpsk0
and qpsk1.
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only, for a-long
and a-short options) Specifies the RS interleave depth. The valid range is
from 0 to 114.
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only, for a-long
and a-short options) Specifies the RS interleave block size. The valid range
is from 18 to 2048.
The number of bytes that can be corrected per FEC code word. For
DOCSIS 1.0 and DOCSIS 1.1 mode, valid values are from 0 to 10
(decimal), where 0 means no FEC. For DOCSIS 2.0 A-TDMA mode, the
valid values are from 0 to 16 (decimal), where 0 means no FEC.
FEC code-word length. Valid values are from 16 to 253.
Maximum burst length in minislots. Valid values are from 0 to 255, where
0 means no limit.
Guard time in symbols. The time between successive bursts, with a range
from 22 to 255. (In Cisco IOS Release 12.2(15)BC2 and earlier releases, the
minimum guard time was 0 symbols, but we do not recommend using a
guard time smaller than 22 symbols.)
Modulation. Valid entries are 16qam and qpsk for DOCSIS 1.0 and
DOCSIS 1.1 upstreams. Valid entries are 8qam, 16qam, 32qam, 64qam,
and qpsk for DOCSIS 2.0 upstreams.
Enable or disable scrambler. Valid entries are scrambler and no-
scrambler.
Cisco Broadband Cable Command Reference Guide
cable modulation-profile
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