问题:
A . 1+1 is based on APS, while 1:1 is based on IPS.
B . 1:1 is used in SNCP switching, while 1+1 is used in MS-SPRing switching.
C . 1+1 sends signals on Working and Protect paths, while 1:1 sends signals only on Working path.
D . 1+1 sends signals on Working path ONLY, while 1:1 sends signals on both Working and Protect paths.
● 参考解析
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