Optical ports of the OTU board

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The OTU board provides two groups of optical ports: IN/OUT and Rx/Tx. The IN and OUT ports correspond to WDM-side input and output, and the Rx and Tx ports correspond to SDH-side input and output. The WDM side is also called the line side; the SDH side is also called the client side. In the alarm parameters, 1 indicates the WDM-side transceiver optical port, and 2 indicates the SDH-side transceiver optical port. In some documents, the optical ports of the OTU board are classified into system-side and line-side ports. In the early period, the system side is also called the client side.

Other related questions:
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.

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.

Optical ports of an FIU board
An FIU board has a total of seven optical ports. The IN/OUT optical port is used to receive and transmit line optical signals. The RC/TC optical port is used to receive and transmit optical signals of the main optical channel. The RM/TM optical port is used to receive and transmit optical signals of the supervisory channel. The MON optical port is used to output optical signals to the spectrum analyzer board for online optical performance monitoring.

Whether an OTU board supports optical module replacement with an optical module of another wavelength
For OTU boards supporting pluggable SFP optical modules, the wavelength information depends on the optical modules, and therefore their optical modules can be replaced with optical modules of other wavelengths.

Difference between the IN/OUT ports and TX/RX ports on an OTU board
The IN/OUT port of an OTU board is the WDM-side port for connecting to a MUX/DEMUX board, while the TX/RX port is the client-side port for connecting to access equipment.

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