The E&M signal defines the type of connection between a relay device and a signaling unit. Which of the following belongs to the relay device?
Which of the following options can reduce the effects of nonlinear effects in the WDM system? (Multiple Choice)
When 10-minute error-free test is performed on a certain wavelength division channel, the local end uses the SDH analyzer to interconnect with the client-side interface of the OTU board. The peer OTU client-side interface needs to perform fiber self-loop. When you are self-looping, you must add solid decay.
When the optical cable between the FIU and the FIU fails, the optical layer alarm reported by the downlink site is (). (Multiple Choice)
