Whether the local or peer laser is turned off when ALS is enabled on the 52TOG board but no optical signal is input to the client side of the board

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The peer client-side laser is turned off.

Other related questions:
Whether the client-side optical port of the peer OTU board does not send or receive optical signals if the client-side optical port of the local OTU board does not with ALS enabled
According to the ALS principle, if the local OTU board does not receive any optical signal on its client side, the peer OTU board will not emit light on its client side.

Whether the TOM board on the OSN 6800 supports 1.25G optical modules and whether the client-side laser on the local board emits light if no light is received on the client side of the peer board
The client side of a TOM board supports optical modules with rates ranging from 100 Mbit/s to 2.5 Gbit/s. When ALS is enabled for the client-side laser on the local TOM board, the client-side laser on the local board will not emit light if no light is received on the client side of the peer board. When ALS is disabled for the client-side laser on the local TOM board, the status of the client-side laser on the local board is not adversely affected by the client-side light receiving status of the peer board.

Whether the laser on an FIU board can be turned off
An FIU board is not equipped with any laser. Instead, it has only optical splitters, multiplexers, and demultiplexers. Therefore, no laser can be turned off.

Function of automatically shutting down the client-side laser of a board
If this function is enabled, the client-side laser of a board will be automatically shut down when the WDM side of the board receives no optical signal.

Method used to keep the laser on an OTU board off since it is automatically turned on 5 minutes after it is turned off
You can set Laser shutdown to Disable in Automatic Disabling of NE Function on the U2000.

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