APPLICATIONS

The 23WT23 board is a modem that converts serial data according to the CCITT V.23 standard.

Therefore, it can be used for transmission over leased PTT lines, private networks or radios.

The two-wire or four-wire mode of operation can be selected via jumpers. The Voice Frequency (VF) output has a high impedance and can connect up to 10 remote stations to multiple pull-down lines.

The modem 23WT23 is available in two versions (rubrics):

– R0001: 5 VDC power supply

– R0002: 24 VDC power supply

Features

The 23WT23 circuit board is a printed circuit in Eurocard (160 mm x 100 mm) format.

All necessary configurations, such as transmit-output level, receiver sensitivity, and two- or four-wire operation, can be configured via jumpers.

The interface to the Data Terminal Equipment (DTE) operates according to the RS 232-C standard and provides the following signals:

– TxD Transmit Data

– RxD Receive Data

– RTS request to send

– DCD Data carrier detect

– CTS Clear to transmit

– DSR Data setup ready

The receiver level is monitored and the alarm relay, together with the light-emitting diode (LED) “ST”, indicates a longer (approx. 4-6 seconds) interruption of the carrier.

The LED on the front panel shows the signal status of the RS 232-C interface. The serial interface signals as well as the VFT line can be measured or opened using the disconnect test socket on the front panel.