Description of the optical ports on a transceiver OTU board

Question:
A transceiver OTU board provides two groups of optical ports: IN/OUT and Rx/Tx. The IN port inputs WDM-side signals and the OUT port outputs WDM-side signals. The Rx port inputs SDH-side signals and the Tx port outputs SDH-side signals. WDM side is also called line side, and SDH side is also called client side. In alarm parameters, the WDM-side IN/OUT port number is 1, and the SDH-side Rx/Tx port number is 2.
In some documents, the optical ports of a transceiver OTU board may be at the system side or line side. What is system side?

Answer:
System side is the former name of client side. Pay attention to distinguish the names.

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