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. 113
Power Conditioning Module and Cabling
The C4 CMTS requires two -48V power feeds, A and B, for redundancy. The source can be an external battery plant or
independent AC/DC power supply. In the event that one feed fails or is removed from service for maintenance, the other
feed continues to supply power to the C4 CMTS with no interruption in service.
Note: Review the total current consumption of all equipment on the same line before supplying power to the C4 CMTS.
Avoid sharing a power source that requires large currents.
Power is filtered and conditioned by a Power Conditioning Module (PCM) for each feed. The PCM contains the power input
connector, main breaker, and all active circuitry for power distribution of a power bus.
The PCM:
Soft starts the chassis on power up
Filters noise and power disturbances from the power feeds
Monitors the power draw of the chassis and shuts down a branch circuit in the event of a power fault
Each PCM is removable and can be replaced without interrupting power to the C4 CMTS in a duplex power configuration.
Figure 14: Installing a PCM
CAUTION: Do not connect the cables to a PCM that is not in a chassis.
Be sure to shut the breaker off for the unit and disconnect the -48V power cable before removing the PCM from the
chassis.
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