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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Annex
The CMTS supports multiple annexes in one system. See
Upstream (US) Channel to Physical Connector Mapping
Guidelines for mapping upstream channels to physical connectors:
There must be no frequency overlap among the upstream channels using the same connector.
The CMTS displays the following error message when the user attempts to change an upstream power level or channel
width to a value that is not valid for that power level group:
Upstream channel power level conflict with another channel using the same connector.
If you receive the above message, the power level and channel width will remain unchanged.
The following guidelines are specific to the 12U CAM:
There are 8 physical connectors and 12 upstream channels on the 12U CAM. If all channels are enabled then at least
one physical connector will receive more than one upstream channel.
Any upstream or all of the upstreams can be connected to any one of the physical upstream connectors.
The following guidelines are specific to the 24U CAM:
There are 8 physical connectors and 24 upstream channels on the 24U CAM. When all upstreams are active, at least
two connectors will be in use.
Upstream channels 0-11 are connected to connectors 0, 2, 4 and 6 while upstream channels 12-23 are connected to
connectors 1, 3, 5 and 7.
Upstream channels connected to a single physical connector may vary in channel width and power levels as long as the
variance falls within a user-configured power level group. The tables below describe the upstream receiver power level
groups. All of the power levels for all of the channels connected to a single physical connector must fall within the
same table.
24U CAM Upstream Power Level Groups
All upstream Rx (receive) values are measured in dBmV. Power after attenuation may vary slightly from one CAM to
another.