Cisco Systems Cisco uBR10012 manual Turning a DC PEM Off

Chapter 5 Maintaining the Cisco uBR10012 Router

Removing and Replacing DC Power Entry Modules

Step 4 (Optional) Turn off the DC power source that is providing power for this DC PEM. All LEDs on the DC PEM should turn off. (This step is required only if you need to rewire the terminal block for this PEM, as described in step 6.)

Tip Separate DC power sources should be used for each DC PEM. This allows you to turn off the power source for the DC PEM being replaced without affecting the power source for the online DC PEM.

Figure 5-6 Turning a DC PEM Off

ALARMS

ACO

CRITICAL MAJOR

MINOR

STATUS

FAIL

PERFORMANCE ROUTING ENGINE

ALARMS

ACO

C RITICAL MAJOR

MINOR

STATUS

FAIL

PERFORMANCE ROUTING ENGINE

OFF OFF OFF

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Step 5 Loosen the captive screws on the DC PEM you are removing and pull the PEM from the chassis using the handles on the faceplate (see Figure 5-7). Set the DC PEM aside.

Step 6 If the MISWIRE LED indicated that the DC power source is miswired,

a.Verify that the DC power source has been turned off.

b.Then verify that the wires leading to the DC power source are connected as follows:

–The cable providing the –48/–60 VDC should be connected to the bottom terminal on the DC terminal block. This cable is typically red.

–The cable providing the return path should be connected to the top terminal on the DC terminal block. This cable is typically black.

Step 7 If the wires were reversed when connected, switch them so that they provide the power signals as listed above (see Figure 5-8).

Warning Use copper conductors only. Statement 1025

Cisco uBR10012 Universal Broadband Router Hardware Installation Guide

OL-18259-01 5-9