Considerations for handling bit errors in SDH long-haul transmission

Considerations for handling bit errors in SDH long-haul transmission:
1. Whether dispersion compensation is proper.
2. Whether non-linear effects exist due to excessively high incident optical power.
3. Whether the signal-to-noise ratio is excessively low.
4. Whether the optical board is faulty.
5. Whether the quality of the optical line deteriorates.

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