LPT/ALS functions and differences between them

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After ALS is enabled, when a fault occurs on the client or WDM side, the laser on the optical port in the corresponding transmit direction will be turned off. The laser will be recovered after signals in the receive direction are restored to normal. With the ALS function enabled, fault information can be sent to notify client equipment of the link status.
The LPT function applies to scenarios in which WDM equipment receives FE, GE, or 10GE LAN services. With the LPT function, lasers on WDM equipment are alternately turned on and off. The on/off status of the lasers enables devices to know the link status. The devices will trigger service protection when detecting an unexpected link state, and switch services to the working or protection link to avoid service interruption.
From the network layer perspective, the ALS function is similar to the LPT function. The main differences lie in applicable services, fault information transmission modes, and the laser restart mechanisms.

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