ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 238)

11. System Parameter Specification
MSAP2000 Technical Manual V3.0 11-9
11.6. Pay Phones
Parameters FXO-P (COT) FXS-P (RT)
Subscriber Phone
Signaling format DP and DTMF
Signaling Transmission
Format Channel Associated Signaling (CAS) or
Common Channel Signaling (CCS)
Caller ID Display (See
“Note” below) DTMF and FSK
Impedance (balanced) 900
Ω 600Ω
Line Code ITU-T G.711 A-law
Polarity Reversal Polarity Guard Polarity Reversal
Detection
Minimum startup
voltage required for RT
≥20mA. The DC
loop resistance is
1200
Ω (including
internal phone
resistance)
Charging Signal (Figure
11-G) 16KHz 160Hz
(12KHz 120Hz) 16KHz 160Hz
(12KHz 120Hz)
Detection 3~5Vrms
Charging Pulse 1V~3V
Standard
specification
(Table 11-C)
DC Voltage -44V~-56V