Are both of the power indicators lit on the top of the Alcatel-Lucent 1665 DMXtend shelf?

Perform a thorough visual inspection of the shelf access panel and power connectors. Look for signs of damage or a loose power connection.

Important!

Each -48V power feeder supplies redundant power to the shelf circuit packs. It is highly unlikely that a circuit pack failure would cause a circuit breaker to trip. The more probable cause of a failure in a feeder/circuit breaker is a short in the backplane feeder path or a problem with a circuit pack connector.

Were any problems found involving the power connections?

Monitor the DC power supplied to the shelf.

Important!

A -48 VDC power alarm indicates the loss one of the two redundant -48 VDC power feeds.

Is the DC voltage normal (-48 VDC) at both connectors?

Unseat the SYSCTL circuit pack from the shelf and reset the tripped circuit breaker.

Does the circuit breaker remain reset?

NOTICE Service-disruption hazard

Removing a transmission circuit pack may disrupt service.

Before removing a transmission circuit pack, verify that the circuit pack is not carrying service.

Before taking action, determine the extent of service disruption caused by disconnecting cables or replacing a circuit pack. Then, perform the action(s) deemed appropriate in light of the traffic being carried and the nature of the failure.

Remove the protection circuit packs on the shelf, one at a time. After each removal, reset the tripped circuit breaker.

Does the circuit breaker remain reset?

NOTICE Service-disruption hazard

Removing a transmission circuit pack may disrupt service.

Before removing a transmission circuit pack, verify that the circuit pack is not carrying service.

Before taking action, determine the extent of service disruption caused by disconnecting cables or replacing a circuit pack. Then, perform the action(s) deemed appropriate in light of the traffic being carried and the nature of the failure.

For the electrical interface transmission circuit packs where protection circuit packs are available, switch the service to the protection circuit pack by selecting select Fault → Protection Switch from the System View.

Highlight the Pack x for the circuit pack that you are removing and click Select.

Result:

On the right side of the Switch Protection window, the Switch Type: pull-down menu appears.

From the Switch Type: pull-down menu, select Forced and click Apply.

Result:

A warning message appears asking you to confirm executing this command. Click Yes.

To verify that the switch has occurred:

1. From the System View, select View → Protection.

2. Highlight the circuit pack that you are replacing and click Select.

3. Verify that Protection Switch State: reads Standby and the Equipment State: reads Out of Service.

4. Verify that Protection Switch Priority: reads Forced.

Replace the service circuit packs (now Out of Service) one at a time. After each removal, reset the tripped circuit breaker.

Does the circuit breaker remain reset?

From the System View, select Fault → Protection Switch, highlight the appropriate Protection Group, and then click Select.

In the Protection Switch Mode section of the window, click on the drop down menu for Switch Type. Select Reset and click Apply.

Result:

A warning message appears asking you to confirm executing this command. Click Yes.

In the Switch Protection window, click Close.

From the System View, click the Alarm List button and click Refresh.

Result:

The -48V power/fuse failed alarm is no longer present.

End of steps