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Cuda 12000 IP Access Switch CLI-based Administration Guide
Configuring Upstream Channels 393
Frequency
The Frequency (MHz) parameter sets the upstream signal frequency for the
RF carrier. You may choose an acceptable DOCSIS range from 5.0 - 42.0
MHz; or an acceptable EuroDOCSIS range from 5.0 - 65.0 MHz.
You set the upstream channel status by performing the following tasks.
Channel Width (kHz)
The Channel Width parameter sets the upstream channel width in kilohertz
(kHz). By default, the Channel Width is set at 3200 kHz (2560 kilosymbols -
ksyms). Acceptable values include:
■ 200K (160 ksyms per second)
■ 400K (320 ksyms per second)
■ 800K (640 ksyms per second)
■ 1600K (1280 ksyms per second)
■ 3200K (2560 ksyms per second)
When modifying the channel width, consider the following:
■ The symbol rate is recomputed as follows:
symbol rate = channel width/1.25
■ A higher symbol rate is more susceptible to RF noise and interference.
■ If you use a symbol rate or modulation format beyond the capabilities of
your HFC network, packet loss or loss of cable modem connectivity may
occur.
Task Command
1. Enter interface cable mode. interface cable <c/s/i>
2. Set the upstream channel
frequency.
upstream <port number> frequency
<value>