Features: 1) Imported erbium-doped fiber, and high steady imported 980nm pump laser or 980nm cooperating 1480nm pump (double pump structure), noise is lower 2) Microprocessor automatic control circuit makes both pumps work at best state. Dependability and stability are better 3) Front panel blue VFD display, shows various main work status parameters 4) Various output power for selection 5) RS485 control interface can realize network management status monitor 6) 19 1U high-standard framework type installation 7) With advanced circuit design, reasonable structure, material slap-up and high index, this machine is suitable for using at large or middle network