This SAE-2Eth2E1-IPOTDM converter that use the FPGA chips and easy to upgrade , which supplies 1-2Channel E1 channel configuration, can automatically detect the number of E1 and select the E1 available.the SAE-2Eth2E1-IPOTDM include 2Channel 100BASE-TX which using reverse direction multiplexing technology to bundle for multiple E1 circuits to transmit the Ethernet data of 2Channel 100BASE-TX. It can realize 1~2E1 channel to convert between Ethernet optical interface. This device can transmit the transceiver signal point to point to Ethernet optical interface to make E1 channels interconnected with Ethernet optical interface. It allows E1 lines transmission time delay difference. This converter SAE-2Eth2E1-IPOTDM is made with high quality of rigorous screened components, which have superior performance in stability, environmental adaptability. It can work normally in very cold environment to very hot from -35℃to +75℃. The product is planned in a way to have better resistance against corrosion and electromagnetic interference. Power input also made a suitable and reliable types of power, to get more powerful suitability to environment.