Specifications

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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
b. Double-click the protection group that contains the reporting card.
c. Highlight either selected group.
d. Click Clear and click YES at the confirmation dialog box.
Step 5 If the alarm persists, the problem is at the far-end node. Verify the cabling and physical connections that
connect to the far-end card.
Step 6 Do a soft reset on the far-end card.
Step 7 Switch from the far-end working card to the far-end protect card.
1.3.74 LOS (DS-N)
• Critical, Service affecting
This alarm indicates a loss of signal (LOS) at the card for either a DS-3 port or a DS-1 port. LOS occurs
when the port on the card is in-service but no signal is being received. The cabling is not correctly
connected to the card, or no signal exists on the line. Possible causes for no signal on the line include
upstream equipment failure or a fiber cut.
Caution Always use the supplied electrostatic discharge wristband when working with a powered ONS 15454.
Plug the wristband cable into the ESD jack located on the lower-right outside edge of the shelf
assembly.
Procedure: Clear the LOS Alarm on the DS-3, DS3XM-6, or DS-1 Card
Step 1 Verify cabling continuity to the port.
Step 2 Verify that the correct port is in-service.
Step 3 Use a test set to confirm that a valid signal exists on the line. Test the line as close to the receiving card
as possible.
Step 4 Ensure that the transmit and receive outputs from the DSx panel to your equipment are properly
connected.
Step 5 If there is a valid signal, replace the DS-1 or DS-3 cable connector on the ONS 15454.
Step 6 Repeat Steps 1 - 5 for another port on the card.
Step 7 Look for another alarm that may identify the source of the problem.
Step 8 Replace the reporting card.
Note When you replace a card with an identical type of card, you do not need to make any changes
to the database.