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ADC Telecommunications, Inc.
386 C
HAPTER 18: CONFIGURING CABLE MODEM TERMINATION SYSTEMS
Downstream interleave-depth
The Downstream interleave-depth parameter sets the FEC Interleaving for
the downstream channel. By default, the Downstream interleave-depth for
DOCSIS is set at taps32Increment4. A higher value improves protection from
noise bursts; however, it may slow down the downstream data transfer rate.
The Downstream interleave-depth for EuroDOCSIS must be set at
taps12Increment7.
NOTE: The first time you install a EuroDOCSIS module you must set the
interleave depth to taps12Increment7, in order for the cable modems to
register with the downstream channel.
You set the downstream interleave depth by performing the following tasks.
Task Command
1. Enter interface cable mode. interface cable <c/s/i>
2. Configure the DOCSIS
downstream interleave depth.
Valid interleave depth values:
■ taps8Increment16
■ taps16Increment 8
■ taps32Increment4
■ taps64Increment2
■ taps128Increment1
downstream interleave-depth
{8 | 16 | 32 | 64 | 128}
3. Configure the EuroDOCSIS
downstream interleave depth.
The valid interleave depth value
is: taps12Increment7
downstream interleave-depth 12