The received optical power of downstream stations is not flat and the wavelengths report the IN_PWR_LOW alarm because the designed pass-through wavelengths are not connected.
Symptom
The result of commissioning the OptiX BWS 1600G system at station A shows that the three LWC1 boards use the 21st wavelength, 23rd wavelength, and 40th wavelength. When the fibers are properly connected, the optical amplifier board is adjusted to the nominal value. The LWC1 boards that use the 21st wavelength and the 40th wavelength report the IN_PWR_LOW alarm.
Cause Analysis
- The tail fiber or optical attenuator is faulty.
- The transmit part of the opposite end or the receive part of the local end is faulty.
Procedure
- Remove the tail fiber of the D40 and then measure the launched optical power of each optical interface of the D40. The launched optical power of the LWC1 boards that use the 21st wavelength and the 40th wavelength is about 5 dB different from that of the LWC1 board that uses the 23rd wavelength. Check on the upstream station shows that the upstream 2*OTM station B has only one OTU (LWC1 board using the 23rd wavelength) and only the LWC1 board of No.1 OTM is connected to the LWC1 board of No.2 OTM on the client site. Further check on the upstream OTM station C shows that station C has three LWC1 boards, just like the local station.
- According to the design document, the 21st and 40th wavelengths are to pass through station B but they are not connected. To connect the two wavelengths, connect the interface on D40 at station OTM1 for the two interfaces to the mapping interface on M40 of station OTM2.
- When the alarm is cleared, check the input optical power of the three local LWC1 boards. The optical power flatness meets the requirement.
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