The difference threshold between the working and protection channels in 5 dB. The initial optical power on both channels is 2 dBm. When the fiber attenuation of the working channel increases, its optical power changes to -4 dBm and the optical power of the protection channel remains unchanged. This triggers optical line protection switching.
Wavelength division multiplexing (WDM) refers to a technology that transmits optical signals at____over one optical fiber. (Enter only lowercase letters.)
Generally, which of the following operations will interrupt services on live networks?
FILL BLANK
ODUk SNCP has three subtypes: _____, ______, and _____. (Enter the acronyms in uppercase letters.)
Drag the functional units of a WDM system to corresponding abbreviated module names.
On a WDM network, if OA and OSC board in two directions report optical loss alarms, which of the following is the most likely cause?
A multiframe alignment signal is used for multiframe alignment. When some OTUk and ODUk overhead signals need to be transmitted across multiple frames, the MFAS must be used to implement multi-frame alignment.
Which of the following terms has the meaning that "the wavelength carrying local services can be transmitted to a specific direction"?
In an OA-free system, the lower threshold of the receive optical power of a line board or the WDM side of an OTU board Is the optical module's receiver sensitivity plus 3 dB.
A VOA is configured on each wavelength path of a WSS board to adjust the____of optical signals to achieve flatness adjustment. (Enter only lowercase letters.)
