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US08908506B2 Method and system for switching APS service channel and automatic protection switching device 有权
APS业务通道和自动保护倒换设备切换方法及系统

Method and system for switching APS service channel and automatic protection switching device
摘要：
A method and a system for switching an APS service channel, and an automatic protection switching device are disclosed. The method includes: a first recovered side reaches a wait-to-restore (WTR) state when the first recovered side receives information about transition to the WTR state from a second recovered side if a current state of the first recovered side is a first No Request (NR) state and if a state prior to transition to the first NR state is a Signal Fail (SF) state; and the first recovered side reaches a second NR state upon expiry of a WTR time of the first recovered side after receiving WTR time expiry information sent by the second recovered side. Therefore, the user can know the WTR state of the first recovered side clearly.
摘要（中）：

公开了用于切换APS服务信道的方法和系统，以及自动保护切换装置。 该方法包括：当第一恢复侧从第二恢复侧接收关于从第二恢复侧转换到WTR状态的信息时，第一恢复侧达到等待恢复（WTR）状态，如果第一恢复侧的当前状态是第一恢复 请求（NR）状态，并且如果转换到第一NR状态之前的状态是信号失败（SF）状态; 并且在接收到由第二恢复侧发送的WTR时间到期信息之后，第一恢复侧在第一恢复侧的WTR时间期满时达到第二NR状态。 因此，用户可以清楚地知道第一恢复侧的WTR状态。

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