GMX ?-1102L transmission equipment is designed and manufactured in Japan Hitachi Cable, Ltd. Gigabit Ethernet long-distance transmission equipment, multiplexing can be four Gigabit Ethernet signals through the TDM (time division multiplexing technology) used to re- two optical fiber and transmitted to the 80km distance, while supporting redundancy multiplexing ports, combined with Hitachi Cable WAN Ethernet solution, the formation of the high cost of metro and long-range campus.