Device for realizing lossless switching and alarming of optical longitudinal channel based on FPGA (Field Programmable Gate Array)

The utility model discloses a device for realizing lossless switching and alarming of a longitudinal optical channel based on an FPGA (Field Programmable Gate Array). The device is arranged between the longitudinal optical channel and an optical fiber longitudinal differential protection device. The light longitudinal channel comprises a main light longitudinal channel and a standby light longitudinal channel; comprising a message receiving module, a message sending module, a main sending module, a standby sending module, a main receiving module, a standby receiving module and a control module, and the control module comprises a field programmable logic gate array. On the basis of FPGA parallel processing and delay controllable capability, data messages are received and forwarded, transmission delay is reduced to the maximum extent, and the technical problem that error codes and broken codes are prone to being generated in a main and standby optical longitudinal channel switching mode in the prior art is solv