2N Helios - 5.1 Technical Parameters

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

U = 60 V
Off-hook AC impedance

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


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

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

Overvoltage protection  between A, B
conductors
1000 V
