Guantai 2 Channels PCM Voice Telephone Fiber Optic Media Converters with Ethernet 1Pair Transmission distance by single mode up to 20Km, FC fiber port The PCM telephone Optical ASIC devices are developed by our company independently develop and produce PCM telephone service products. The device to LSI and programmable logic chip as the core, then the intersection constitute (FXS), switch port (FXO), Ethernet, and other interface PCM integrated access products. This series of PCM telephone equipment is in a maximum-core optical fiber transmission line telephone transmission 1-2, 1 (10 / 100M Ethernet data) transmission equipment. Equipment using standard desktop chassis. Shape simple and beautiful. External power supply for AC 100~240V- DC 12V power supply. Anti-interference ability, built-in lightning protection Provide 2 channel telephone transmission with 1 Ethernet