Technical information

Cuda 12000 IP Access Switch CudaView Administration Guide
Configuring the Downstream Channel 495
Downstream Channel Statistics
Downstream Channel Statistics monitor the number of bytes transmitted on
an interface and the number of packets transmitted on the downstream
channel. To display downstream channel statistics, follow this procedure:
1. In the Downstream Channel window, click the Statistics tab.
2. Click Refresh to update the information. Refer to Table 18-6.
Downstream
Channel
Interleave Depth
Sets the FEC Interleaving for the downstream channel. The
drop-down menu lists the values that are supported for
DOCSIS and EuroDOCSIS.
DOCSIS — By default, Interleave Depth is set at
taps32Increment4. Following are the acceptable values for a
DOCSIS module. A higher value improves protection from
noise bursts; however, it may increase latency.
■ taps8Increment16
■ taps16Increment 8
■ taps32Increment4
■ taps64Increment2
■ taps128Increment1
EuroDOCSIS — The Interleave Depth for a EuroDOCSIS
module must be set at taps12Increment7. NOTE: The first
time you install a EuroDOCSIS module you must set the
interleave depth, in order for the cable modems to register
with the downstream channel.
Downstream
Channel Annex
Type
Provides support for MPEG framing format for 1x4 DOCSIS
and 1x4 EuroDOCSIS modules. The Cuda 12000
automatically detects MPEG framing format, as follows:
Annex A — Indicates an MPEG framing format for a 1x4
EuroDOCSIS module.
Annex B — Indicates an MPEG framing format for a 1x4
DOCSIS module.
Symbol Rate Specifies the MAC symbol rate in symbols per second:
■ qam64 - 5,056,941 symbols per second
■ qam256 - 5,360,537 symbols per second
Parameter Description