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[单选] 光通道保护(OPCS)的波长分配原则:逆时针方向利用()为工作波长,()为保护波长In terms of the classification principle of wavelength in the optical path protection (OPCS), the anti-clockwise direction uses()as the working wavelength and()as the protection wavelength.
A.偶数波长 奇数波长\ nEven wavelength Odd wavelength B.奇数波长 偶数波长 \ nOdd wavelength Even wavelength C.奇数波长 奇数波长\ nOdd wavelength Odd wavelength D.偶数波长 偶数波长\ nEven wavelength Even wavelength
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