Cisco ONS 15454 SDH Especificaciones descargar pdf (Pagina 65)

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Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3

May 2002

Chapter 1 Alarm Troubleshooting

Alarm Procedures

1.5.47 LOS (STM-N)

• Critical, Service-affecting

This alarm indicates a signal loss at the card for an STM-N 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 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 STM-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 STM-N to your equipment are properly connected.

Step 5 If there is a valid signal, replace the STM-N 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.

1.5.48 MEA (EQPT)

• Critical, Service-affecting

The mismatch between entity/equipment type and provisioned attributes alarm occurs when the physical

card inserted in a slot does not match the card type that is provisioned for that slot in CTC. The alarm

clears when the provisioned card type and the physical card type match.

Procedure: Clear the MEA Alarm

Step 1 Physically verify the type of card that sits in the slot reported in the object column of the MEA row on

the alarms screen.

Step 2 Click the Inventory tab to reveal the provisioned card type.

Step 3 If you prefer the card type depicted by CTC, physically insert that type of card (provisioned for that slot).

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Cisco ONS 15454 SDH Especificaciones Pagina 65