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Specifications

ManualsBrandsCisco ManualsComputer equipment15454-TCC - Network Processor Card
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Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 1 Alarm Troubleshooting
b. If no local practice exists, use a CLETOP Real-Type or equivalent fiber-optic cleaner and follow the
instructions accompanying the product.
Step 5 Verify that the power level of the optical signal is within the OC-N card’s receiver specifications. The
“Optical Card Transmit and Receive Levels” section on page 2-35 lists these specifications for each
card.
Step 6 If there is a valid signal, replace the connector on the backplane.
Step 7 Repeat Steps 1 - 5 for another port on the card.
Step 8 Replace the OC-N card.
1.3.77 LOS (EC-1)
• Critical, Service affecting
A port on the reporting EC-1 card has a loss of signal (LOS) condition. An LOS occurs when a SONET
receiver detects an all-zero pattern for 10 microseconds or longer. An LOS means the upstream
transmitter has failed. If an EC-1 LOS alarm is not accompanied by additional alarms, a fiber break or
cabling problem is usually the cause of the alarm. The condition clears when two consecutive valid
frames are received.
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 EC-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 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.