A.Short-distance week-to-week communication, the signal level is STM-16 and the working window is
1310nm

B.Short distance communication, the signal level is STM-1 and the working window is 1310nm

C.Short distance communication, the signal level is STM-16 and the working window is 1550nm

D.Long distance communication, the signal level is STM-1 and the working window is 1310nm

A.The tunnel protection group is switched, and the working channel is unavailable

B.Tunnel protection group is degraded and the availability of the protection group is reduced

C.The tunnel protection group is switched and the protection channel is unavailable

D.The tunnel protection group is interrupted, and the bearer services are interrupted

A.Low noise figure

B.High output power

C.High gain

D.The working wavelength is consistent with the minimum attenuation window of single-mode fiber

E.Gain Flattening

A.MZ modulation light source

B.Light source of EA modulation method

C.Direct modulation light source

D.Coherent reception modulation mode light source

A.L2 switch + router

B.STP

C.GVRP

D.L3 Switch