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Nokia Optical Diagnostics and Troubleshooting Sample Questions:

1. Suppose a "Channel Absent" alarm is reported on an 1830 PSS node. What is the recommended order for the following troubleshooting steps?

A) 1. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
2. Retrieve the cross-connection (XC) details and see what Wave Keys should be present.
3. Check observed Wave Keys against expected Wave Keys.
4. Retrieve the channel power trace.
B) 1. Retrieve the cross-connection (XC) details and see what virave Keys should be present.
2. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
3. Retrieve the channel power trace.
4. Check observed Wave Keys against expected Wave Keys.
C) 1. Check observed Wave Keys against expected Wave Keys.
2. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
3. Retrieve the channel power trace.
4. Retrieve the cross-connection (XC) details and see what Wave Keys should be present.
D) 1. Retrieve the channel power trace.
2. Retrieve the cross-connection (XC) details and see what Wave Keys should be present.
3. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
4. Check observed Wave Keys against expected Wave Keys.

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

3. Consider the exhibit. Given the following power readings, what is the calculated span loss from Node A to Node B?

A) 2.0 dB
B) 10.0 dB
C) 5.0 dB
D) 8.0 dB

4. Suppose a node is experiencing a little unexpected attenuation over the Optical Supervisory Channel (OSC) transmit direction. Which of the following statements is FALSE?

A) A "Data Link Down" alarm will raise on the adjacent node.
B) Traffic will pass between the local and adjacent node.
C) A Power adjustments action will fail on the local node.
D) No OSC-related alarms will raise on the local node.

Solutions: