Cisco ONS 15454 SDH Specifications Page 64

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
d. Click the Provisioning > Line tabs.
e. Verify that the line type of the reporting port matches the line type of the signal source.
f. If the signal source line type does not match the reporting port, click Type and enter the correct type.
g. Click Apply.
Step 2 If the alarm does not clear when the coding and framing of the ONS 15454 SDH match the coding and
framing of the signal source, replace the STM-N card.
Note When replacing a card with an identical type of card, you do not need to change the CTC
database.
1.5.46 LOS (E-N)
Critical, Service-affecting
The loss of signal alarm means signal was lost at the card for either an E1 port or an E3 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 cable cut.
Caution Always use the supplied electrostatic discharge wristband when working with a powered
ONS 15454 SDH. Plug the wristband cable into the ESD jack located on the middle-right outside edge
of the shelf assembly.
Procedure: Clear the LOS Alarm on an E-N 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 E-1 or E-3 panel to your equipment are properly
connected.
Step 5 If there is a valid signal, replace the E-1 or E-3 fiber cable connector on the ONS 15454 SDH.
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 replacing a card with an identical type of card, you do not need to change the CTC
database.
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