Line Interference
Number of channels: 4 per card, Max of 4 option cards per Gemini unit
DSP channel usage: 4 DSP IP channels per card
Signalling: Loop start or ground
DTMF: DTMF detection for DDOI routing
Bypass phone operation: Phone is switched out of circuit whenever FXO channel is in use
Line Impedance: CTR21, 600R, 900R or Japan – software selectable
Return loss: >18dB 300-400Hz Protection: FCC pt 68 type B longitudinal surge, 1500V: FCC pt 68 type B metallic surge, 800V
Ring equivalency number: REN <0.2
Longitudinal balance: >60dB (200-1000Hz); 40dB (1000-4000Hz)
Common mode rejection ratio (CMRR): On hook >70dB 50-500Hz Vcm=60Vrms; Off hook >40dB 50-500Hz Vcm=60Vrms
Common mode overload level (CMOL): On hook >300Vrms 50-60Hz; Off hook >250Vrms 50-60Hz
Max trip/ring voltage: 300V (Correct operation not implied) Recommended max 120V
Max loop current: 90mA
Ringing voltage – detect: Typically 22V, min 26V, 17-68Hz
Ringing voltage – no detect: Typically 14V, max 18V, 1768Hz
THD: <1% at 0dBm, 1kHz
Crosstalk: <-85dB (inter-channel and inter-card)
Insertion Loss: 0dB
Nominal line TX level: -9dBm ± 1dB
Input level adjustment: Via software –9dB to +12dB in steps of 1.5dB
Output level adjustment: Via software –34.5dB to +12dB in steps of 1.5dB. Mute option
Freq response: 300Hz – 3200Hz ± 2dB ref to 1kHz (8kHz sampling)
Connectors
Line: RJ11 2 pin modular jack socket
Bypass Phone: 1 per channel (4)
Phone connector pinout: Pin 3 – tip (B), Pin 4 – ring (A), other pins - unused
Ringing
Ring Cadence: US Ringtone
Echo Suppression
General: DSP Based adaptive filter providing acoustic & network suppression
Tail length (acoustic): 63.5ms
ERLE: 30dB typical
Environmental
Operating temperature range: 32° to 122°F (0 to 50°C)
Storage temperature range: -4° to 140°F (-20° to 60°C)
Operating humidity: 20 to 90% at 104°F/40°C non-condensing