Unframed E1 Fiber Modem

The unframed E1 fiber modem provides one E1 interface and one optical interface, enabling interface conversion between E1 and optical signals. In unframed mode, users can utilize a data channel speed of 2.048Mbps. The device is equipped with a built-in loopback testing feature, which facilitates engineering provisioning and routine maintenance.

● The device simultaneously supports adaptive 120Ω/balanced and 75Ω/unbalanced impedance, eliminating the need for manual configuration.

● The system has undergone rigorous testing and practical validation, fully complying with ITU-T recommendations such as G.703 and G.704.

● It provides 3 loopback functions: optical loopback, E1  local loopback, and remote E1 loopback.

● It offers a pseudo-random code testing function (PATT), equivalent to a built-in error detector, facilitating line provisioning testing.

● Optional power supply options include AC 220V, DC -48V, and DC +24V, with no polarity distinction for DC power supply.

● Fiber

Fiber: single/dual fiber

Fiber Interfaces: FC/SC/ST/LC (SFP)

Wavelength: 850nm/1310nm (Multi-mode); 1310nm/1550nm (Single-mode)

Non-relay Transmission Distance: 20-120km

Typical Transmit Power:

  Single-mode 1310/1550nm: ≥-9dBm

  Multi-mode 850nm: -18dBm

  Multi-mode 1310nm: -25dBm

Receive Sensitivity Range: -28dBm to -40dBm

● E1 Interface

Standard: Comply with protocol G.703

Rate: n*64Kbps±50ppm

Line Code: HDB3

Impedance: Unbalanced 75Ω/Balanced 120Ω

Jitter Characteristics: Comply with G.742 and G.823 recommendations

Input Attenuation Range: 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)