The version of an OLT used in an office is V800R005C33B118, and the P2P terminal is the FG102 of xavi. When the FG102 is connected to the optical port on the OPFA board through the optical fiber, the wan LED of the FG102 is off. Through the Web page, it is found that the state of the FG102 is displayed as unconnected. In this case, check the P2P port through the BMS. It is found that the port is offline. Then, check the information about the optical transceiver. It is found that the Rx optical power is �50 dBm, which indicates that the optical signals are not received.
1. Change the working mode of the P2P port, and enable the port to switch between the forced mode and the auto-negotiation mode. After that, the fault persists.
2. Use an optical power meter to measure transmit optical power of the two ends. It is found that the Tx optical power is normal.
3. Refer to the product manual. It is found that the upstream port of the FG192 works in the 100BASE-BX10-U mode and the working wavelengths are Tx 1310 nm/Rx 1550 nm, which are the same as those of the optical transceiver on the OPFA board.
4. Replace the optical transceiver with an optical transceiver that works in the 100BASE-BX10-D mode and at wavelengths Tx 1550 nm/Rx 1310 nm. It is found that the fault is rectified.
The P2P service is achieved through the IEEE802.3ah 100BASE-BX10 standard at the physical layer. This standard defines the one-fiber bidirectional transmission. That is, optical signals are transmitted over an optical fiber with wavelengths 1550 nm and 1310 nm. Devices at the ends of the optical fiber must work in the 100BASE-BX10-D mode and the 100BASE-BX10-U mode respectively. That is, the receive wavelength of one end is the transmit wavelength of the other end, and the transmit wavelength of one end is the receive wavelength of the other end. In this case, transmission is implemented.