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[单选] 在M800通道保护环中,如果出现保护倒换故障,可能的原因有很多,以下的几个原因中,哪个不是导致保护倒换失败的原因In the M800 channel protection ring, a lot of factors may cause the protection switchover failure. Among the following factors, which one is not the factor that causes the protection switchover failure?()
A.OPA输入光功率过弱,导致OPA产生APR钳位操作The OPA input optical power is so weak that it causes OPA to invoke the APR clamp operation. B.保护使能没有打开The protection function is not enabled. C.OSC收无光,无法正确启动APS. The OSC receives no optical power and the APS cannot be enabled properly. D.OPCS光开关故障,无法执行保护倒换The OPCS optical switch is faulty and protection switchover cannot be performed.
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