Chapter 9: Upstream Cable Access Modules (UCAMs)
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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How to Configure an Upstream (US) Channel
Perform the following procedures for US channel 0 and repeat as necessary for all channels on this CAM. The valid
range for US channels is 0–11 (12U CAM) or 0-23 (24U CAM). Some steps are optional. By not executing the optional
steps, default settings are applied.
Valid Center Frequencies
In the first step, set the center frequency of the upstream channel. The range of valid center frequencies varies according
to the channel width selected. The overall upstream bandwidth in North America is from 5–65 MHz. The first valid center
frequency in Hertz is 5,000,000 plus ½ of the channel width. The last valid frequency is 65,000,000 minus ½ of the channel
width. Thus, 5-65 MHz is the overall upstream range.
To calculate valid upstream center frequencies, refer to the table below.
Note: The CLI supplies meaningful error messages for some but not all invalid combinations of channel width and
frequency. If the CLI has no error message to give, a generic SNMP-level message is displayed.
Table 51.
Range of Valid Center Frequencies for Upstream Channels in North America
If channel width is…
Then first valid center frequency is…
And the last valid center frequency is…
1600000
5800000
64200000
3200000
6600000
63400000
6400000
8800000
61800000
1.
(Required) Set the center frequency of the US port in Hertz:
configure interface cable-upstream <slot>/<port> cable frequency <5100000-64900000>