Services Are Unavailable Due to Inappropriate Types of Optical Modules

Appropriate types of optical modules need to be selected to match transmission distances.

Product

• OptiX OSN 1500A/1500B
• OptiX OSN 2500
• OptiX OSN 3500
• OptiX OSN 7500

Fault Type

Unavailable services

Symptom

The OptiX OSN NEs at both ends of the link are configured with the SL4 boards. The SL4 boards are connected through fibers, but services are unavailable.

Cause Analysis

Possible causes of the fault are as follows:

• The SL4 boards are faulty.
• The fibers are faulty.
• The optical distribution frame is faulty.
• The optical modules are faulty.
• The distance between the two NEs exceeds the maximum transmission distance supported by the optical modules.

Procedure

1. Check the parameters associated with the SL4 boards. No exceptions are found. The boards, however, reported the R_LOS alarm, indicating the loss of signal.
2. Use the optical time-domain reflectometer (OTDR) to test the fibers. The fibers are normal.
3. Check the connections between the NEs and the optical distribution frame. The connections are normal.
4. Check the optical modules on the SL4 boards. The optical modules are normal.
5. Measure the distance between the two NEs. The distance is 26 km whereas the S-4.1 optical modules used on the SL4 boards support a maximum transmission distance of 15 km. Therefore, the services are unavailable due to inappropriate types of optical modules.
6. Use the appropriate types of optical modules. Then, the fault is rectified.

Related Information

None.

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