Features *Based on self -copyright IC *Modular wide dynamic optical detector *Uses standard 2 wire telephone (non-telephone handles) set as engineering order-wire hotline(optional) *E1 interface comply with G.703, adopts digital clock recovery and smooth phase-lock technology *When optical signal lost, it can detect the remote device is power off or fiber is disconnected, and indicates alarm by LED *The local device can view the remote device working condition *Provide command the remote interface Loop Back, ease line maintenance *The transmission distance is up to 2-120Km without interruption *AC 220V, DC-48V, DC+24V can be optional *DC-48V/DC+24V power supply with automatic polarity detection function, when installed without distinction between positive and negative   Parameters * Fiber Multi-mode Fiber 50/125um, 62.5/125um, Maximum transmission distance: 5Km @ 62.5 / 125um single mode fiber,attenuation (3dbm/km) Wave Length: 820nm Transmitting power:    -12dBm (Min) ~-9dBm (Max) Receiver sensitivity:    -28dBm (Min) Link budget:    16dBm Single-mode Fiber 8/125um, 9/125um Maximum transmission distance:     40Km Transmission distance: 40Km @ 9 / 125um single mode fiber, attenuation (0.35dbm/km) Wave Length: 1310nm Transmitting power:    -9dBm (Min) ~-8dBm (Max) Receiver sensitivity:    -27dBm (Min) Link budget:    18dBm *E1 Interface Interface Standard: comply with protocol G.703; Interface Rate: 2048Kbps±50ppm; Interface Code: HDB3; E1 Impedance: 75Ω (unbalance), 120Ω (balance); Jitter tolerance: In accord with protocol G.742 and G.823 Allowed Attenuation: 0~6dBm *Working environment Working temperature: -10°C ~ 50°C Working Humidity: 5%~95 % (no condensation) Storage temperature:    -40°C ~ 80°C Storage Humidity: 5%~95 % (no condensation)