Cisco ONS 15454 SDH Specifications download pdf (Page 77)

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

May 2002

Chapter 1 Alarm Troubleshooting

Alarm Procedures

Procedure: Clear the SYNCSEC Alarm

Step 1 From the node view, click the Provisioning > Timing tabs.

Step 2 Check the current configuration of the REF-2 for the NE Reference.

Step 3 If the secondary reference is a BITS input, verify the wiring connection from the ONS 15454 SDH

backplane BITS clock pin fields to the timing source.

Step 4 Check that the BITS clock is operating properly.

Step 5 If the secondary timing source is an incoming port on the ONS 15454 SDH, complete the “LOS (E-N)”

procedure on page 1-40.

1.5.68 SYNCTHIRD

• Minor, Non-service affecting

A loss of timing on the third reference alarm occurs when the ONS 15454 SDH loses the third timing

source (reference 3). The ONS 15454 SDH uses three ranking timing references. The timing references

are typically two BITS-level or line-level sources and an internal reference. If SYNCTHIRD occurs and

the ONS 15454 SDH uses an internal reference for source three, then the TCC-I card may have failed.

The ONS 15454 SDH often reports either FRNGSYNC or HLDOVERSYNC alarms after a

SYNCTHIRD alarm.

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 SYNCTHIRD Alarm

Step 1 From node view, click the Provisioning > Timing tabs.

Step 2 Check the current configuration of the REF-3 for the NE Reference.

Step 3 If the third timing source is a BITS input, verify the wiring connection from the ONS 15454 SDH

backplane BITS clock pin fields to the timing source.

Step 4 Check that the BITS clock is operating properly.

Step 5 If the third timing source is an incoming port on the ONS 15454 SDH, complete the “LOS (E-N)”

procedure on page 1-40.

Step 6 If the third timing source uses the internal ONS 15454 SDH timing, perform a software reset on the

TCC-I card:

a. Display the CTC node view.

b. Position the cursor over the slot reporting the alarm.

c. Right-click and choose RESET CARD.

Step 7 If this fails to clear the alarm, physically reseat the TCC-I card.

Step 8 If the reset fails to clear the alarm, replace the TCC-I card.

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Cisco ONS 15454 SDH Specifications Page 77