Description of the problem

On Huawei Metro1000 equipment, a large number of RSBBE, MSBBE, and HPBBE errors are reported on the optical circuit boards, resulting in frequent TU_AIS alarms on the PD1 single board, and services are unavailable.

Processing

If Huawei SDH equipment reports B1 error codes, it is usually caused by the following reasons:

1. abnormal input optical power.

2. fiber link abnormality.

3, SFP optical module or optical board abnormality.

4、The fiber type does not match the SFP module type.

Root cause

1310nm working wavelength of the SFP module can not use G655 fiber for long-distance transmission

Solution

1. G.655 fiber cannot transmit 1310 nm signals because the cutoff wavelength of G.655 fiber is 1480 nm.

2、If the BER is generated but the input power is normal, it is usually because the SFP module type does not match the fiber type.

Recommendations and Summary

1, G.655 fiber cannot transmit 1310 nm signals because the cutoff wavelength of G.655 fiber is 1480 nm.

2、If the BER is generated but the input power is normal, it is usually because the SFP module type does not match the fiber type.

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