The spectrum analyzer cannot scan a wavelength of the LWC board due to the drift of this wavelength.
Symptom
After one LWC board that operates at 192.9 THz is added to the OptiX Metro 6100 equipment on a network for capacity expansion, the MON port on the WBA board detects neither the 192.9 THz wavelength nor one more wavelength.
Cause Analysis
The possible causes of the problem are as follows:
- The LWC board is faulty.
- The WBA board is faulty.
Procedure
- Query the optical power at the IN optical port on the WBA board. The query result shows that the optical power at the IN optical interface after the expansion is the same as that before the expansion. This indicates that the added wavelength does not reach the WBA board.
- Use an optical power meter to test the LWC board. The test result shows that the output frequency of the board is 193.09 Hz. The WDM-side wavelength drift of the LWC board is large. Therefore, the wavelength of the LWC board does not match that of the M40 board interconnected with the LWC board.
- Replace the faulty LWC board and then test the output frequency at the MON interface on the new LWC board. The test result shows that the output frequency is within the normal range.
Reference Information
Wavelength drift on the OTU board will cause low output optical power on the M40 board. Therefore, ensure that center frequency of each output wavelength on the WDM side of the OTU board is within the range of ±10 GHz from its nominal center frequency.
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