The LPT (Link Pass Through) function is applied to the scenario where WDM equipment accesses FE/GE/10GE LAN services. Which statement about LPT is correct? (Multiple choice)

The LPT (Link Pass Through) function is applied to the scenario where WDM equipment accesses FE/GE/10GE LAN services. Which statement about LPT is correct? (Multiple choice)
A . It makes the user equipment perceive the link status information by turning off and on the laser of the WDM device, thereby triggering the user equipment to enable the service protection function and select the active or standby link for communication
B. From the perspective of the network, ALS has similar functions to LPT (Link Pass Through), and the differences are mainly reflected in applicable services, fault transmission methods, and laser restart mechanisms.
C. The LPT function can be divided into port-based LPT and service-based LPT in terms of implementation methods.
D. By adding overhead bytes supporting the LPT protocol to the signal frame format on the WDM side, the running status of the network access point or service network can be monitored.

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Answer: ABCD