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3.2 Connection
160 Installation Manual
External Modem Connection
After connecting the Hybrid IP-PBX and the external modem, set the power switch of the external modem
to "ON", then the external modem will be initialized with the default values.
The following AT command settings may be required for the modem:
• The Data Terminal Ready (DTR) signal should be ignored.
• The Data Terminal Equipment (DTE)/Modem flow control should be turned off.
• Data compression should be disabled.
• Error Correction is not necessary.
Notes
• Use an RS-232C straight cable for connection between the Hybrid IP-PBX and external modem.
• An AT command (for initialization, enabling automatic answer, etc.) can only be programmed by
KX-TDA Maintenance Console. "AT&F0Q0E0V1S0=1X0&D0" is stored as the default value.
• For more information about the AT command, refer to the external modem's instructions.
To RS-232C port (25-pin)
RS-232C Port
(9-pin)
To CO line/Hybrid IP-PBX extension
port assigned as the CO line destination
Modem
3
2
20
6
RD (RXD)
SD (TXD)
ER (DTR)
DR (DSR)
2 RD (RXD)
3 SD (TXD)
4 ER (DTR)
6 DR (DSR)
External Modem (25-pin)
Signal Name Pin No. Pin No.
Hybrid IP-PBX (9-pin)
Signal Name