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.
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How to Cable the PCM
1.
Refer to the figure above and follow the steps below to cable the PCM.
2.
Two cables, one red and one blue (each containing two 6 gauge wires, one red and one white) are included with the C4
CMTS. One end of each cable is connectorized and keyed for the power connector on the rear of the chassis.
a.
Make sure the breaker is in the OFF position before plugging in the power feed cables.
b.
Using the connectorized end of the red cable, plug it directly into the PCM Power Feed A.
c.
Using the connectorized end of the blue cable, plug it directly into the PCM Power Feed B.
CAUTION: You must ensure the power connections maintain the proper polarity. Your power source cables might be
labeled (+) and (-) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used
by the external DC power source at your site determines how the ARRIS CMTS power cables are connected.
3.
Each cable contains two 6-gauge wires (one red and one white) that must be hard-wired to the DC source by a
qualified service electrician.
a.
Connect the red wire to the negative (—) side of the -48V supply.
b.
Connect the white wire to the positive (+) or return side of the -48V supply.
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.
Replacing a PCM
Follow the steps below to replace a PCM:
1.
Be sure you are wearing an ESD strap when handling PCMs.
2.
Confirm that you have approximately 7 inches of clearance from the rear of the PCM and any RF cabling in order to
remove the module. If removal of RF cabling is required for clearance, be sure to label the cables appropriately first.
3.
Confirm that the other PCM and its power feed is currently functioning. Flip up the hinged front panel at the top of the
chassis and verify that the corresponding set of Bus Branch LEDs are green.