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. 294
6 long tdma qpsk 96 F 8 220 338 0 8 T T - - - - - - -
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
Then first valid center frequency is…
And the last valid center frequency is…
1. (Required) Set the center frequency of the US port in Hertz:
configure inter
face cable-ups
tream <slot>/<port> cable
frequency <5100000
-64900000>
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