Cisco ONS 15454 SDH Specifications download pdf (Page 32)

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

May 2002

Chapter 1 Alarm Troubleshooting

Alarm Procedures

c. Record the node ID number.

d. Repeat Steps a – c for all nodes in the ring.

e. If two nodes have the same node ID number, change one node ID number so that each has a unique

node ID.

f. Click Apply.

Step 2 Verify correct configuration of East port and West port optical fibers by following the procedure in the

“EXCCOL” section on page 1-31.

Step 3 If the ring is a four-fiber MS-SPRing, make sure that each protect fiber is connected to another protect

fiber and each working fiber is connected to another working fiber. The software does not report any

alarm if there is a working fiber incorrectly attached to a protect fiber.

Step 4 Click Yes to accept the ring map.

Step 5 If the alarm does not clear, check the ring map for each ONS 15454 SDH in the network and verify that

each node is visible to the other nodes:

a. At the node (default) view, click the Provisioning > Ring tabs.

b. Highlight an MS-SPRing.

c. Click Ring Map.

d. Verify that each node that is part of the ring appears on the ring map with a node ID and IP address.

e. Click Close.

Step 6 If nodes are not visible, ensure that Section Data Communications Channel (SDCC) terminations exist on

each node:

a. Click the Provisioning > SDH DCC tabs.

b. Click Create.

c. Click the STM-N card that links to the adjacent node.

d. Click OK.

Step 7 If the alarm still does not clear, login to http://www.cisco.com/tac for more information or login to

http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml to obtain a directory of Cisco

Technical Assistance Center toll-free numbers for your country.

1.5.3 APSC-IMP

• Minor, Non-service affecting

An improper APS code alarm indicates invalid K bytes. This alarm occurs on STM-N cards in an

MS-SPRing configuration. The receiving equipment monitors K bytes or K1 and K2 APS bytes for an

indication to switch from the working card to the protect card or vice versa. K1/K2 bytes also contain

bits that tell the receiving equipment whether the K byte is valid. APSC-IMP occurs when these bits

indicate a bad or invalid K byte. The alarm clears when the node receives valid K bytes.

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.

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Cisco ONS 15454 SDH Specifications Page 32