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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Internal Branch Protection
Each A and B power feed is further divided into two internal chassis distribution branches, A and B. Each of these external
power feeds is protected by both an electronic circuit breaker and a 20-amp fuse located in the PM. These fuses constitute
the second level of protection. They are not field replaceable, nor can they be reset.
These feeds supply power to the C4c CMTS midplane and to all circuit modules. Power is distributed to the eight slots and
the Fan Tray Module by the two branches as shown below.
Figure 40:
Second Level — Internal Branch Fusing
If, for example, a damaged module or bent pin causes an electrical short, the fuses protect the power distribution wiring
and midplane circuitry from damage.
The entire feed for a side is turned on and off by pressing the power control button on the power panel as shown in the
figure below. Each push of the button toggles the power from that feed (one push turns it off, the next push turns it on).