Whether the TN53NQ2 board supports the WDM-side loopback

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The TN53NQ2 board supports the WDM-side loopback only when ODU2 or ODU2e signals are received on the backplane side.

Other related questions:
Constraints on loopbacks of the TN53NQ2 board
A loopback on the TN53NQ2 board can apply only to service granularities received from the backplane side. For example, ODU0 granularities received from the backplane side can be looped back, but ODU1 granularities multiplexed from ODU0 granularities cannot be looped back on the TN53NQ2 board.

Reason why the WDM-side signals of the TN12LOG board can be regenerated by the TN12ND2/TN52ND2/TN53ND2/TN53NQ2/TN54NQ2 board
WDM-side signals of the TN12LOG board can be regenerated by the TN12ND2/TN52ND2/TN53ND2/TN53NQ2/TN54NQ2 board because they have the same FEC type.

Access rate of a WDM-side port on the TMX board
The WDM-side signals of the TMX board are OTU2 signals, and the access rate is 10.71 Gbit/s.

Do TE30 endpoints support VGA loopback
TE30 endpoints do not support VGA loopback.

Method used to determine whether optical fiber connections are correct between a router and a WDM board on the client-side of WDM equipment
Disable the ALS function for the client-side laser of the WDM board and enable the laser to forcibly emit light. If the optical port on the router receives optical signals, the optical fiber in the transmit direction is correctly connected. Stop the router from emitting light. If the WDM board reports an R_LOS alarm, the optical fiber in the receive direction is correctly connected.

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