Description of the optical ports on a transceiver OTU board

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?

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

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