2N LiftNet, User Manual

Page: 90 / 99

Technical Parameters 6.1
90
6.1 Technical Parameters
Telephone Parameters
Parameter Value Conditions
Minimum line current 15 mA off-hook
Minimum line voltage 22 V on-hook
Off-hook DC voltage drop
< 8 V
< 16 V
I = 25 mA
I = 50 mA
Off-hook resistance
>1MΩ
U = 25..100
V
Off-hook 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 kΩ
C = 1 μF
25 to 50 Hz
Ringing detector sensitivity 10 to 20 V 25 to 50 Hz
Pulse dialling 40 / 60 ms
DTMF dialling level 6 a 8 dB ± 2
dB
20 to 60 mA
Dial-tone detector sensitivity approx. 43
dB
Overvoltage protection- between
A, B
1000 V 8 / 20 μs
Notes

All the product parameters comply with TBR-21 on condition that the
product is to be operated as a single line terminal, i.e. no parallel
connection with any other equipment is allowed.

Line interference and noise picked up by the LN microphone are relevant
factors.