Fiber connections for the SFIU boards

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The fiber connections for SFIU boards vary depending on their positions on the NEs and networks.

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Fibers connected using SFIU boards
Each port on the SFIU board supports bidirectional transmission. It can receive or transmit a signal depending on the position of the SFIU board. The optical ports LINE1, LINE2, SYS1, and SYS2 can be used to transmit or receive signals on the main optical path.

Fiber connections of TN12OAU boards
One multiplexed optical signal received at 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 then transmitted to the DCM board through the TDC port for dispersion compensation. Then, the signal is sent back through the RDC port. The amplified multiplexed signals are output through the OUT port. The multiplexed signal can also be input through the VI port and output through the VO port after the optical power is adjusted. Then, the IN port receives the multiplexed signal sent from the VO port.

Optical fiber connections of the TN12OAU board
One multiplexed optical signal received at 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 then transmitted to the DCM board through the TDC port for dispersion compensation. Then, the signal is sent back through the RDC port. The amplified multiplexed signals are output through the OUT port. The multiplexed signal can also be input through the VI port and output through the VO port after the optical power is adjusted. Then, the IN port receives the multiplexed signal sent from the VO port.

Functions of the SFIU board
The SFIU board is an optical multiplexing and demultiplexing unit. It multiplexes and demultiplexes signals transmitted over the main optical channel and OSC, avoiding commissioning and compensation for IEEE 1588v2 signals.

Types of fibers used to connect the HBA board
LSH/APC connectors and fibers are used on the OUT port of the HBA board, and LC connectors and fibers are used on the IN port of the HBA board.

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