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. 308
11 Advanced PHY UGS This IE is new with DOCSIS 2.0. It allows parameters to be optimized for UGS flows, which normally
carry VoIP.
12U/24U Ingress Noise Cancellation
The following CLI command is used to enable ingress cancellation:
configure interface cable-upstream <x>/<y> cable ingress-cancellation [interval <int>] [size
<int>]
The recommended values for the interval and size parameters are as follows:
Interval 100
Size 0
Notes on DOCSIS 3.0 Upstream Frequency Range
DOCSIS 3.0 (North America) provides for an extended upstream frequency range of 42 – 85 MHz.
The 12U CAM supports an upstream range of 5 – 65 MHz: it is limited by hardware constraints to a maximum of 65 MHz. The
24U CAM hardware has been designed to support a range of 5-85 MHz, but currently the software will only support a range of
5-65 MHz.
Use the following command to set the maximum upstream frequency for all channels (global) within the chassis:
configure cable freq-us-max {42 | 55 | 65 |85} [no]
The default maximum upstream frequency for global Annex A is 65 MHz; for Annex B it is 42. The maximum upstream
frequency of 55 MHz must be explicitly set.
The no parameter sets the upstream frequency range to the default value specified by the current Annex.
Use the following command to set the maximum upstream frequency for a specific cable-mac within the chassis:
configure interface cable-mac <x> cable freq-us-max {42 | 55 | 65 | 85}
To display the global upstream frequency range, use the following command:
show cable global-settings
To display the upstream frequency range on a specific cable-mac (which takes precedence over the global setting), use the
following command:
show interface cable-mac <x> | include upstream
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