Chapter 4: C4 CMTS General Installation Requirements
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
118
The figure below shows the LEDs and power switches for Buses A and B. The system alarm and power indicator LEDs are in
the middle of this panel.
Figure 17:
LED and Power Bus Switches
Power Protection Description
The C4 CMTS chassis power configuration consists of three levels of protection:
A and B power feeds controlled by circuit breaker in the PCM
Internal chassis branch fuses and electronic circuit breakers located in the PCM
Fuses located on the front modules (These fuses are not field replaceable)
The C4 CMTS must be installed only by trained service personnel who are familiar with the precautions required when
working in a –48V DC power delivery environment. Power requirements are listed in see "
(page 79).
A and B Power Feeds
Power is supplied to the C4 CMTS via A and B feeds located at the rear of the unit. The C4 CMTS chassis is protected by two
70-amp breakers located on the rear of the chassis, shown in the figure below. This is the first level of protection.