Pay phones – ZyXEL Communications Multi-service Access Platform MSAP2000 User Manual
Page 238
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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
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