GMX ?-1102L transmission equipment is designed and manufactured in Japan Hitachi Cable, Ltd. Gigabit Ethernet long-distance transmission equipment, multiplexing, can signal via two Gigabit Ethernet TDM (time division multiplexing technology) used to re- 2G bandwidth fiber all the way and transfer them to the 80km distance, for the user to save a precious fiber resources, combined with Hitachi Cable WAN Ethernet solution, the formation of the high cost of metro and long-range campus.