1. The input optical power is excessively low.
2. The insertion loss between the TDC board and the RDC board is excessively large.
3. The required OA type cannot satisfy the optical power requirements for system design.
1. Query/Set the current nominal gain of the board by running the :cfg-get/set-stdgain:bid,4,1 command.
2. Query the current actual gain of the board by running the :cfg-get-gain:bid,4,1 command.
3. The actual gain is the optical power of the OUT port minus the optical power of the IN port.