NoteFor pin assignments and maximum cabling distance, refer to "2.6.8 CTI-LINK Card (KX-TDA0410)".External Modem ConnectionTo RS-232C port (25-pin)RS-232C Port(9-pin)To trunk/PBX extensionport assigned as the trunk destinationModemExternal Modem (25-pin) PBX (9-pin)32206RD (RXD)SD (TXD)ER (DTR)DR (DSR)2 RD (RXD)3 SD (TXD)4 ER (DTR)6 DR (DSR)Signal Name Pin No. Pin No. Signal NameCAUTIONTo protect the system, keep the following in mind:1. Make sure that both connector cases (frame ground) of the RS-232C straight cable (shielded cable)are conductive. If they are not conductive, make sure that both connector cases of the cable are firmlyconnected.2. If this is not possible, connect the frame of the PBX to the frame of the PC using an earthing wire inorder to prevent difference in the electrical potentials.After connecting the PBX and the external modem, set the power switch of the external modem to "ON", thenthe external modem will be initialised 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.Note• An AT command (for initialisation, enabling automatic answer, etc.) can only be programmed by theMaintenance Console. "AT&F" is stored as the default value.• For more information about the AT command, refer to the external modem’s instructions.138 Installation Manual3.2.1 PC Connection
