After a certain distance transmission in the wavelength division system, the optical signal-to-noise ratio of the signal at the receiving end will decrease to a certain extent. The main reason is which of the following?

OSN6800 equipment, ND2, TQX report the BUS_ERROR alarm after configuring the power cross-connect, what are the possible reasons?

When the PTN equipment configures the CBS parameters of QoS, the value affects which items are described correctly

For ODUK SNCP protection, which of the following types does not apply to the pass-through site being an electrical relay site?

OptiX OSN8800 provides 8 kinds of DCM optical modules, corresponding to compensation distances of
10km, 20km, 40km, 60km, 80km, 100km, 120km and 140km
respectively