Cisco ONS 15454 SDH Specifications download pdf (Page 55)

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

May 2002

Chapter 1 Alarm Troubleshooting

Alarm Procedures

Step 8 If any span has an East-to-West or West-to-West connection, physically switch the fiber cable connectors

from the card that does not fit the pattern to the card that will continue the pattern. This should clear the

alarm.

Note The physical switch procedure is the recommend method of clearing this alarm. This method

reestablishes the logical pattern of connection in the ring. However, you can also use CTC to

recreate the span and identify the misconnected slot/ports as East and West. This is useful when

the misconnected node is not geographically near the troubleshooter.

Warning

On the OC192 LR/STM64 LH 1550 card, the laser is on when the card is booted and the safety key is in

the on position (labeled 1). The port does not have to be in service for the laser to be on. The laser is

off when the safety key is off (labeled 0).

Warning

Invisible laser radiation may be emitted from the end of the unterminated fiber cable or connector. Do

not stare into the beam directly with optical instruments. Viewing the laser output with certain optical

instruments (for example, eye loupes, magnifiers, and microscopes) within a distance of 100 mm may

pose an eye hazard. Use of controls and adjustments or performance of procedures other than those

specified may result in hazardous radiation exposure.

Procedure: Clear the E-W-MISMATCH Alarm with CTC

Step 1 Log into the misconnected node. This is the node with both ring fiber cables misconnected. It is in the

middle of the two nodes that have one of two ring fiber cables misconnected.

Step 2 Click the Provisioning > Ring tabs.

Step 3 From the row of information for the fiber span, write down the node ID, ring ID, and the slot and port in

the East line list and West line list.

Step 4 Click the row from Step 3 to select it and click Delete.

Step 5 Click Create.

Step 6 Fill in the ring ID and node ID from the information collected in Step 3.

Step 7 Change the West line pull-down menu to the slot/port you recorded for the East line in Step 3.

Step 8 Change the East line pull-down menu to the slot/port you recorded for the West line in Step 3.

Step 9 Click OK.

Step 10 Click Yes at the Ring Map Change dialog box.

Step 11 Click Accept at the new ring map.

1.5.30 EXCCOL

• Minor, Non-service affecting

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Cisco ONS 15454 SDH Specifications Page 55