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Installing the Chassis Ground Connection

Preventing Power Loss

Use the following guidelines to prevent power loss to the router:

•

Use the information in the

Cisco ASR 920 Series Router based on a given configuration of the router. Determining power

requirements is useful for planning the power distribution system needed to support the router.

Activating a DC Power Supply

Perform the following procedure to activate a DC power supply:

Remove the tape from the circuit-breaker router handle, and restore power by moving the circuit-breaker

Step 1

router handle to the On (|) position.

Verify power supply operation by checking if the respective power supply front panel LED (PS0 or PS1)

Step 2

is green.

Step 3

If the LEDs indicate a power problem, see

If you are connecting a redundant DC power supply, repeat these steps for the second power source.

Step 4

If you are connecting a redundant DC power supply, ensure that each power supply is connected to a

Note

separate power source in order to prevent power loss in the event of a power failure.

Activating an AC Power Supply

Perform the following procedure to activate an AC power supply:

Plug the power cord into the power supply.

Step 1

Connect the other end of the power cord to an AC-input power source.

Step 2

Verify power supply operation by checking if the respective power supply front panel LED (PS0 or PS1)

Step 3

is green.

If the LEDs indicate a power problem, see

Step 4

information.

If you are connecting a redundant AC power supply, repeat these steps for the second power source.

Step 5

If you are connecting a redundant AC power supply, ensure that each power supply is connected to a

Note

separate power source in order to prevent power loss in the event of a power failure.

Cisco ASR 920 Series Aggregation Services Router Hardware Installation Guide

3-24

To prevent loss of input power, ensure that the total maximum load on each circuit supplying the

power supplies is within the current ratings of the wiring and breakers.

In some systems, you can use an UPS to protect against power failures at your site. Avoid UPS types

that use ferroresonant technology. These UPS types can become unstable with systems such as the

Cisco ASR 920 Series Router, which can have substantial current-draw fluctuations due to bursty

data traffic patterns.

Table 1-1

Chapter 3

to estimate the power requirements and heat dissipation of a

Chapter 5, "Troubleshooting."

Chapter 5, "Troubleshooting"

Installing the Cisco ASR 920 Series Router

for troubleshooting

OL-32751-01