A.Tunnel layer

B.Section layer

C.Link Layer

D.PW layer

A.In-board 1+1 protection

B.Client side 1+1 protection

C.ODUk SNCP Protection

D.Tributary SNCP Protection

A.The Raman amplifier selects different pump sources to amplify signals in different bands, so the Raman amplifier has no gain bandwidth limit in theory, while the EDFA has a range of gain bandwidth

B.The gain medium of Raman amplifier is transmission fiber; the gain medium of EDFA is EDF (Erbium Doped Fiber)

C.The equivalent noise figure of a Raman amplifier is smaller than that of an EDFA

D.The gain calculation/testing method of Raman amplifier and EDFA is consistent, both are "gain = output power - input power

A.11

B.9

C.8

D.10

A.True

B.False