5. Technical parameters

Minimal off-hook line current

15 mA

Off-hook

Minimal on-hook line voltage

22 V

Off-hook

DC voltage drop (off-hook)

< 8 V< 16 V

I = 25 mA
I = 50 mA

Off-hook resistance

>1MΩ

U = 25..100 V

Off-hook AC impedance

220 Ω + 820 Ω paral. 115 nF

20 to 60 mA

Return loss

> 14 dB

20 to 60 mA

Bandwidth

300 to 3500 Hz

20 to 60 mA

Ringing impedance

> 2 kΩC = 0.47 μF

25 to 50 Hz

Ringing detector sensitivity

10 to 20 V

25 to 50 Hz

Pulse dialing

40 / 60 ms

DTMF dialing level

-9.0 +2.0/-2.5 dB a -11.0 dB +2.5/-2.0 dB

20 to 60 mA

Overvoltage protection – between A, B

1000 V

8 / 20 μs