Zyxel-communications Multi-service Access Platform MSAP2000 Manual do Utilizador descarregar pdf (Página 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) 900Ω 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

1200Ω (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

1 2 ... 233 234 235 236 237 238 239 240 241 242 243

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