Cisco SR2016T-NA Reference Manual page 634

show cable modulation-profile
Scrambler:
Preamble offset:
Preamble type:
RS interleaver on:
RS interleaver depth:
RS interleaver block size:
Router#
Table 3-37
.
Table 3-37 show cable modulation-profile Field Descriptions
Field
Mo
IUC
Type
Preamb length
Diff enco
FEC T bytes
FEC CW size
Scrambl seed
Max B size
Guard time size
Last CW short
Scrambl
Preamb offset
Pre offst
Pre Type
RS
Cisco Broadband Cable Command Reference Guide
3-138
enabled
168
qpsk0
na
0
0
describes the significant fields displayed by the show cable modulation-profile command.
Description
Modulation profile group number. A modulation profile group is the set
of burst profiles that defines upstream transmit characteristics for the
various types of upstream transmission classes.
Interval usage code. Each upstream transmit burst belongs to a class that
is given a number called the interval usage code (IUC). Bandwidth maps
messages (MAP) by IUC codes used to allocate upstream time slots. The
following types are currently defined:
• Request—Bandwidth request slot
• Request Data—Bandwidth request and short data burst slot
Initial Maintenance—Initial link registration contention slot
•
Station Maintenance—Link keepalive slot
•
Short Data Grant—Short data burst slot
•
Long Data Grant—Long data burst slot
•
Modulation type.
Preamble length.
Differential encoding enabled (yes) or not enabled (no).
Number of bytes that can be corrected for each forward error correction
(FEC) code word.
Size, in bytes, of the FEC code word.
Scrambler seed value in hex format.
Maximum burst size.
Time between successive bursts measured in symbols.
Handling of FEC for shortened last code word.
Scrambler enabled (yes) or not enabled (no).
(DOCSIS 1.0 and DOCSIS 1.1 modulation profiles) The bits to be used
for the preamble value.
(DOCSIS 2.0 modulation profiles) The bits to be used for the preamble
value.
(DOCSIS 2.0 modulation profiles) The A-TDMA preamble type (qpsk0
or qpsk1).
(DOCSIS 2.0 modulation profiles) The A-TDMA RS encoding type.
Chapter 3 Cisco CMTS Show Commands
OL-1581-08