The optical signal of () is multiplexed into the same optical fiber for transmission. We call it Wavelength Division Multiplexing in this way.

The signal flow analysis method first divides the whole network into several OMSs, judges the section of the fault, and then judges whether the direction of the fault is one-way or two-way, and finally locates the fault along the direction of the signal flow from front to back according to the fault information.

The number of ODU2e signals multiplexed into ODU3 signals is the same as the number of ODU2 signals multiplexed into ODU3 signals.

Which of the following are the common test indicators for Ethernet services? (Multiple choice)

In the non-converged OTU processing SDH standard signal scenario, both A and B are WDM sites. The client side of the OTU at station A detects an RLOS alarm. The client side of the station detects and reports the REM_SF alarm, and station B transmits the signal to its downstream client device, and reports the R_LOS alarm to the client device.