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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Support of independent adjustment of RF power on a per block upconverter basis
Support of the individual muting of channels within an RF block upconverter group to -50dBc
Automatic Gain Control (AGC) is always enabled on the 16D CAM.
Downstream Test Port on 16D CAM Faceplate
The 16D CAM faceplate test port is meant to verify the presence of a downstream signal. It provides a power level that is
approximately 30 dB less than the configured downstream signal strength. This test port is not meant to be used for signal
calibration, detecting signal spurs, or to be used for precise RF quality measurements. When the test port is not in use, a
75 Ohm terminator should be in place.
A single RF test port is located on the 16D CAM front panel. An LED is lit to reflect which of the 4 upconverters is selected.
These four LEDs are labeled D 0-3, D 4-7, D 8-11, and D 12-15.
A push button allows you to choose which of the four RF block upconverter sources you wish to test. As the push button is
pressed, the next RF output port LED is selected and the associated LED is lit. It then cycles back to the first port after the
last port was selected. See the following figure.
Figure 58:
16D CAM Downstream Test Port
