Technical parameters, Telephone parameters (pstn) – 2N Lift8 v1.0 User Manual
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10. Technical Parameters
This section describes the technical parameters of the
product.
2N Lift8
®
Telephone Parameters (PSTN)
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 kΩC = 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 L8 microphone are relevant
factors.