单项选择题
Whatisthedifferencebetween1+1and1:1protectionswitching?()
- A.1+1isbasedonAPS,while1:1isbasedonIPS.
B.1:1isusedinSNCPswitching,while1+1isusedinMS-SPRingswitching.
C.1+1sendssignalsonWorkingandProtectpaths,while1:1sendssignalsonlyonWorkingpath.
D.1+1sendssignalsonWorkingpathONLY,while1:1sendssignalsonbothWorkingandProtectpaths.
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