2N Lift8 v1.0 - Manual (Page 156)

156
2N TELEKOMUNIKACE a.s., www.2n.cz
®
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.