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. 237
Table 27. XD Cable Access Module LED Descriptions
Powered and in normal service state
Flashing = 1.6 second period. Module power is off: either slot is not provisioned or
module has been disabled.
Fast flashing = 6 times/second. Normal when card is first powered or restored. If fast
flashing persists for more than 2 seconds, there is a serious power problem.
Powered and out of service.
Downloading data from SCM, initializing or running diagnostics.
QAM Modulation Order and Port Requirements
The XD CAM supports:
64QAM and 256QAM operation
A unique setting of 64QAM or 256QAM per F-connector of the 16D CAM PIC.
Each F-connector of the 16D CAM PIC can be set to 64QAM or 256QAM mode independent of the other F-connectors.
Any change to the modulation will change the modulation of all channels on that F-connector.
Spectrum Window and Frequency Grid for Channels on the Same F-connector
Downstream channel frequencies assigned to the same F-connector are required to occupy a limited number of slots of a
frequency grid. For example, a 6 MHz grid would be used (in most cases) for an Annex B card. The size of the spectrum
window (i.e. the total number of slots) is limited by the passband of the analog filters used in the RF upconverters; in the
case of the 16D and XD CAM cards, this is 80 MHz. This is illustrated in the figure below.
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