A.通道共享保護(hù) B.復(fù)用段共享保護(hù) C.通道1+1保護(hù) D.1N保護(hù)
A.3dBm B.2dBm C.1dBm D.0dBm
A.-9dBm B.2dBm C.-14dBm D.-18dBm