2N Door intercom 2N Helios - Manual, 1322 v3.0 - Manual (Page 68)

Technical Parameters 5.1
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5.1 Technical Parameters
Telephone Parameters
Parameter Value Conditions
Minimum required off-hook line current 15 mA Off-hook
Minimum required on-hook line voltage 20 V Hang-up
DC voltage drop (off-hook) < 8 V
< 16 V I = 25 mA
I = 50 mA
Lead current while hang-up < 25 μA U = 60 V
Off-hook AC impedance 220 Ω + 820 Ω
115 nF parallel 20 to 60 mA
Return loss > 10 dB 20 to 60 mA
Bandwidth 300 to 3500 Hz 20 to 60 mA
Ringing impedance > 2 kΩ
C = 1 μF 25 to 50 Hz
Ringing detector sensitivity 10 to 20 V 25 to 50 Hz
Time of response to ringing Variable
Pulse dialling 40 / 60 ms 20 to 60 mA
DTMF level -6 and -8 dB
± 2 dB 20 to 60 mA
DTMF detector sensitivity Min. -40 dB 20 to 60 mA
Dial tone detector sensitivity Min. -40 dB 350 - 500 Hz
Busy tone detection speed Variable 350 - 500 Hz
Continuous tone detection speed Variable 350 - 500 Hz
Ringing tone detection speed Variable 350 - 500 Hz
Overvoltage protection – common mode 1000 V 8 / 20 μs
Overvoltage protection – between A, B
conductors 1000 V 8 / 20 μs