Cisco ONS 15454 SDH Specifications Page 71

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1-47
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 1 Alarm Troubleshooting
Alarm Procedures
Step 2 Check and reseat, if necessary, the connections between the source and the connector B.
Step 3 If the alarm cannot be cleared, check continuity of the power connection with a multimeter.
Step 4 If the alarm cannot be cleared, check power output from the source with a multimeter.
1.5.57 RCVR-MISS
Major, Service-affecting
A facility termination equipment receiver missing alarm occurs when facility termination equipment
detects an incorrect amount of impedance on its backplane connector. This usually occurs when a receive
fiber cable on the E1 port is missing or there is possible mismatch of backplane equipment. For example,
it occurs when an SMB connector or a BNC connector is connected to an E3-12 card.
Note E-3s are four-wire circuits and need a positive (tip) and negative (ring) connection for both transmit and
receive.
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 RCVR-MISS Alarm
Step 1 Ensure that the device attached to the E1 port is operational.
Step 2 Verify that the cabling is securely connected.
Step 3 Verify that the pinouts are correct.
Step 4 Replace the receive fiber cable if Steps 1 – 3 do not clear the alarm.
1.5.58 RING-MISMATCH
Major, Service-affecting
A procedural error mismatched ring alarm occurs when the ring ID of the ONS 15454 SDH that is
reporting the alarm does not match the ring ID of another ONS node in the MS-SPRing. ONS nodes
connected in an MS-SPRing must have identical ring IDs to function.
Procedure: Clear the RING-MISMATCH Alarm
Step 1 Click the Provisioning > Ring tabs.
Step 2 Note the number in the Ring ID field.
Step 3 Log into the next ONS node in the MS-SPRing.
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