2N Analogue UMTS gateway 2N SmartGate UMTS - Manual, 1699 v1.1.0 - Manual (Page 73)

Technical Parameters 5.1
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Telephone Interface FXO (for PBX extension line)
Interface type 2-wire analog, FXO
Telephone connector type RJ 12, 6/2
Line impedance Zr (TBR21) or 600 W (According to model of Gateway)
On-hook DC resistance 1 MW
Off-hook line current 10 - 65 mA
Off-hook line voltage (typ.) 4,5 V for 25 mA
Dial tone frequency adjustable, default 425 Hz
Dialing type tone (DTMF)
Ringing voltage Min. 20 Vrms 25-50 Hz
Ringing impedance 4 - 10 kW / 50 Hz
Dial thru parameters
Voltage drop (typ.) 1,7V / 25 mA
Closed loop resistance (typ.) 6 W
SMS Sending Input
Closed loop resistance max. 1 kW
Open loop resistance Min. 25 kW
Input overvoltage protection max. +/- 12 V
Data Interface
Interface type USB 2.0
Connector USB type B