Chapter 8: Downstream Cable Access Modules (DCAMs)
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Restrictions
When operating in Annex A, all of the 1-4 16D CAM channels assigned to a given F-connector must be grouped in a
spectrum window of 80 MHz. The center frequencies of Annex A channels must be separated by integer multiples of 8
MHz. There is no requirement that the channels be in the same frequency order as their channel numbers.
Note: The spectrum window is a hardware limitation; the RF circuitry contains a bandpass filter which limits how far apart
the channels on an F-connector may be.
QAM Output Power
The 16D CAM with 16 downstreams will support up to 52 dBmV for four QAM channels per port. If the power is changed
on one channel, it will change the power on all channels on that F-connector.
The CLI will enforce the DRFI maximum power level for the number of included channels on an F-connector. The table
below shows the ranges which will be enforced.
Table 24.
16D CAM Maximum Power Level for Included Channels
Included
Channels
DRFI Required Power
Range (dBmV)
Default Power
(dBmV)
CLI Power Range
(dBmV)
1
52-60
52
44-60
2
48-56
52
44-56
3
46-54
52
44-54
4
44-52
52
44-52
Note: The maximum per-channel power level is determined by the number of channels assigned to a cable MAC on the
same F-connector. The following factors do not determine the per-channel power levels:
the administrative or operational state of the channels
the frequency of the channels (even 0 MHz)
muting the channel.