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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QAM Modulation Order and Port Requirements
The 16D CAM supports:
64QAM and 256QAM operation
A unique setting of 64QAM or 256QAM per F-connector on the 16D CAM PIC.
Each F-connector of the 16D CAM PIC is able to set to 64QAM or 256QAM mode independent of the other F-
connectors. Any change to the modulation changes the modulation of all channels on that F-connector.
Spectrum Windows and Downstream Frequency Spacing
All of the downstream channels assigned to a given F-connector on the 16D PIC must be arranged on an evenly spaced
frequency grid. For example, a 6 MHz grid would be used (in most cases) for an Annex B card. The size of the spectrum