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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window is limited to a maximum of 80 MHz by the passband of the analog filters used in the RF upconverters; in the case
of the 16D cards, this is 80 MHz. This is illustrated in the following diagram:
Figure 59:
Example of Spectrum Window for Annex B Using a 6 MHz Frequency Grid
The frequency grid for the 16D CAM has a resolution or step size of 125 kHz. This means that the frequency of the first
channel selected per F-connector must be a multiple of 125 kHz within the frequency range for that annex. All other
channels on the same F-connector are offset by an integer multiple of 6 MHz or 8 MHz, all within a range of 80 MHz edge-
to-edge.
Note: An 8 MHz grid is permitted for Annex B, but is required for Annex A.
