Chapter 46: Command Line Descriptions
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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burst-len <0-255>
Burst length The maximum number of minislots that can be used by the IE. For both short data and advanced PHY short data grant
IEs, this field must be present and must contain a non-zero value. In general, a zero value implies that the IE is not limited. Range =
0–255.
last-cw <true |
false>
Last Codeword This indicates whether the last FEC codeword is of a fixed length or shortened.
True = shortened; False = fixed length.
scrambler <true |
false>
This field indicates whether the scrambler or randomizer is enabled or not.
True = enabled; False = disabled.
guard-time-size <0
| 8-96 | no>
Guard Time This is the amount of time measured in symbols that must exist between successive frames. By definition SCDMA
channels have no additional time between frames; consequently, this parameter cannot be used for SCDMA. This field is required
for non-SCDMA channels and according to the RFI specification must contain a value of at least 5 symbols. This value may be
derivable from other network and architectural parameters. Range = 8–96 symbols.
int-depth <depth>
ATDMA Byte Interleaver Depth This parameter must be present for all IUCs with an ATDMA upstream channel or IUCs 9, 10 and 11
with a tdma-atdma upstream channel. For all other cases, this parameter must not be present. There are three different states for
the ATDMA Byte Interleaver signified by the values: 0 = dynamic mode, 1 = off, 2-floor(2048/(K + 2T)) = fixed mode. In fixed mode,
there is one FEC codeword per row and the depth is the number of rows in the interleaving matrix. In dynamic mode, the system
chooses the row and column sizes of the interleaving matrix to obtain optimum burst noise robustness.
int-blocksize <36-
2048>
ATDMA Byte Interleaver Block Size This parameter must be present for all IUCs with an ATDMA upstream channel or IUCs 9, 10
and 11 with a tdma-atdma upstream channel. For all other cases, this parameter must not be present. This parameter represents the
number of bytes that can be used by the ATDMA interleaver when in the dynamic mode of operation. Range = 2*(K+2T) – 2048. To
obtain optimum benefit of the ATDMA interleaver, use a value of 2048.
pre-type <type>
Preamble Type For DOCSIS 2.0 upstream channels, there are two possible constellation patterns that can be used for the QPSK
preamble: qpsk0 and qpsk1. With qpsk1 the preamble’s constellation is at a higher power level when compared to qpsk0. DOCSIS 1.x
channels must use the qpsk0 constellation pattern.
docsis-mode
<type>
Upstream DOCSIS-Mode This parameter contains the type of the upstream channel which must correspond to one of the following
values:
• tdma (default)
• atdma
• tdma-atdma
