1.1 Product Function
DS3 Fiber Modem’s function is to modulate DS3 data signal to single or multi mode fiber, the transmission rate is 44.736Mbps±20ppm. This device can be used to transmit DS3 signals via fiber.
1.2 Characteristic
n Based on self-copyright IC, and soft content is high;
n Provide 3 loop functions: local device DS3 self loop( outer loop) (ANA); local device self loop( inner loop) (DIG); remote DS3 loop back(REM)
n Supply pseudo-random code testing function(PATT) and this function can be used as a DS3 error code device;
n The power of AC220V/ DC-48V/ DC+24V is suitable for the device DC-48V/DC24V;
n For DC-48V, the positive and negative terminal can be optional.
n Redundancy function. When one fiber cut, another fiber link will connect automatically for back-up.
1.3 Parameters & Index
n DS3 Interface
Standard: DS3 interface support ITU-T G.703
Rate: 44.736Mbps±20ppm
Coding: B3ZD code
Impedance: 75Ω (unbalanced)
Connector: BNC（75Ω）
Jitter tolerance: Support G.742和G.823
CCLK: inner CCLK, line CCLK
n Fiber Interface
Wavelength: Single mode 1310nm/1550nm
Multi mode 850nm/1310nm
Fiber core NO.: Double core or single core for option
Sending consumption: -9dBm/-5dBm
Transmitting range: Single mode 20/40/80/100/120 km for option
Multi mode 0-2 km
Receiving sensitivity: ≤-36dBm (BER<10-11)
Optical code： scrambling NRZ code
1.4 Operating Conditions
Voltage: AC180V-260V, DC-48V, DC+24V
Power Consumption: <=5 Watts
Working temperature: 0°C~50°C
Storage temperature: -40°C~+70°C
Humidity: 95%
No causticity and solvent, dust free, and no strong magnetic interference.
1.5 Power supply
Provide module power supply. The working voltage range is wide with good anti-disturb and isolation, stable working ability.
n DC-48V type: Voltage range DC -36V～DC-72V；
n DC+24V type: Voltage range DC+18V～DC+36V；
n DC-24V type: Voltage range DC -18V～DC-36V；
n AC220V type: Voltage range AC175V～AC250V