Automatic laser shutdown on the SL64 board of the OSN 9500

When one end does not receive optical signals, it reports an R_LOS alarm to automatically shut down the laser, and the peer end shuts down its laser after receiving the R_LOS alarm. To ensure that light emitting can be immediately recovered after a fault is rectified, the lasers on the ports at both ends are turned on every other minute and the turn-on state of the lasers is kept for 2 seconds. If the fault persists, the lasers will be kept shutdown for 1 minute. The lasers at both ends are recovered if optical signals can be received immediately after the fault is rectified.

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