Signal flow on the ITL boards of OSN 8800 devices

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The ITL board is used to multiplex and demultiplex odd and even wavelengths. The wavelengths from the RO and RE ports are multiplexed into one wavelength and then sent out through the OUT port. The wavelength from the IN port is demultiplexed as two wavelengths and sent out through the TO and TE ports separately.

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Signal flows of the ITL boards on OSN 8800
An ITL board is used to multiplex and demultiplex the odd and even wavelengths. The wavelengths from the RO and RE ports are multiplexed into one wavelength and then sent out from the OUT port. The wavelength from the IN port is demultiplexed to two wavelengths and sent out from the TO and TE ports.

Signal flow of the OSN 8800
In general, the NG WDM signal flow is as follows: line board -> multiplexer board -> OA board -> FIU board -> peer FIU board -> peer OA board -> peer demultiplexer board -> peer line board.

Signal flow on an RDU9 board
After optical signals enter the IN port of the RDU9 board, they are split based on power by an optical splitter. Then, one multiplexed signal is output by the EXPO port of the board and the other one is output by the TOA port. The TOA port can be connected to an OA unit. If cascading is not required, the optical signal can be directly input to the ROA port of the RDU board. After the optical signal enters the ROA port, it is evenly split by an optical splitter. The split signals are then output by ports DM1 to DM8 of the RDU board.

Signal flow on the OAU1 board
One multiplexed optical signal received through the IN port is sent to the EDFA optical module. The EDFA optical module amplifies the optical power of the signal and locks the gain of the signal. The signal is added to the DCM board through the TDC port for color dispersion compensation. Then the signal is sent to the RDC port. At last, the amplified multiplexed signal is output through the OUT port. A multiplexed signal can be also input through the VI port, processed for optical power adjustment, and output through the VO port. Then the IN port receives the multiplexed signal sent through the VO port.

OSN 8800 boards that support physical-layer clock signals
All boards of the OSN 8800 support the following operations on physical-layer clock signals: external frequency source access and internal frequency source transmission.

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