Chapter 5: C4c CMTS Installation Requirements
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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a.
The PM on the right side of the chassis is named PM A. It corresponds to the Bus A power panel LEDs and control
switch located on the front of the chassis.
b.
The PM on the left side of the chassis is named PM B. It corresponds to the Bus B power panel LEDs and control
switch located on the front of the chassis.
4.
Hand tighten the two captive fasteners on each of the PMs. If the captive fasteners are tightened using a tool, care
should be exercised not to over-tighten. The recommended torque for these fasteners is 5.0 ±0.5 inch-pounds.
5.
Connect the appropriate power cable.
The C4c CMTS can operate on a single -48V DC or a 115V AC power source, but requires two -48V power feeds, A and B, for
redundancy. In the event that one feed fails or is removed from service for maintenance, the other feed continues to
supply power to the C4c CMTS with no interruption in service.
The source can be an external battery plant or independent AC or DC power supply. The C4c CMTS chassis can have a DC,
AC, AC/DC, DC/DC, or AC/AC Power Module configuration.
The PM contains the power input connector, main breaker, and all active circuitry for power distribution of a power bus.
The Power Module:
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
Note: Review the total current consumption of all equipment on the same line before supplying power to the C4c CMTS.
Avoid sharing a power source that requires large currents.