1. Compatibility issues, for the following reasons:
a. Errors occurred in the process of importing compatible codes;
b. The software update of the device results in the failure of the original compatible code which has not been upgraded;
c. Coding error;
2. The reasons for package loss are as follows:
a. The electronic function circuit of optical module and equipment does not match;
b. The main chip does not match with the device;
c. Physical circuit failure;
d. Equipment failure;
e. The route information is wrong;
3. Optical port pollution and damage: the optical link loss is increased due to the pollution and damage of the optical interface, which leads to the failure of the optical link. The reasons are as follows:
a. The optical port of the optical module is exposed to the environment, and the light port is polluted by dust;
b. The end face of the optical fiber connector used has been polluted, and the optical port of the optical module is secondary polluted;
c. The end face of optical joint with pigtail is not used properly and the end surface is scratched;
d. Use poor quality optical fiber connector;
4. ESD damage, static electricity will absorb dust, change the impedance between lines, affect the function and life of the product, the reasons are as follows:
a. The environment is dry and easy to produce ESD;
b. Abnormal operation, such as: live operation of non hot swap optical module; direct contact with electrostatic sensitive pin of optical module by hand without electrostatic protection; no anti-static packaging during transportation and storage;
c. The equipment is not grounded or poorly grounded。
