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Nokia Optical Diagnostics and Troubleshooting Sample Questions:

1. Consider the exhibit. A single directional fiber cut is occurring between two amplifiers in bidirectional configuration. Which node(s) will report a "LD Input LOS" alarm?

A) Node C only
B) Node A and Node B
C) Node A only
D) Node B only

2. Which of the following Performance Measurement (PM) type is NOT typically retrieved at an Optical Transponder (OT) line interface?

A) Ethernet collision counters
B) Optical Power Received (OPR)
C) Digital Wrapper (DW)
D) Forward Error Correction - Errors Counted (FEC-EC)

3. Which of the following is NOT a characteristic of an Optical Supervisory Channel Loss of Signal (OSC LOS) issue, in case that no "LD Input LOS" alarms are raised against the involved amplifiers?

A) A "Power Adjustment Required" alarm is eventually raised on the local node.
B) A "Data Link Down" alarm is raised on the adjacent node.
C) Traffic does not pass between the local and adjacent nodes.
D) An "Incoming SUPVY LOS" alarm is raised on the local node.

4. Suppose a channel-related alarm is reported on an 1830 PSS node, and is related to a possible Wave Keys clock source issue. What is the recommended order for the following troubleshooting steps?

A) 1. Replace the suspect PF.
2. Retrieve the channel power trace.
3. Switch to alternate clock source (PF).
4. Determine the active clock reference source.
B) 1. Retrieve the channel power trace.
2. Replace the suspect PF.
3. Determine the active clock reference source.
4. Switch to alternate clock source (PF).
C) 1. Retrieve the channel power trace.
2. Determine the active clock reference source.
3. Switch to alternate clock source (PF).
4. Replace the suspect PF.
D) 1. Determine the active clock reference source.
2. Replace the suspect PF.
3. Retrieve the channel power trace.
4. Switch to alternate clock source (PF).

Solutions: