TD-23 Modem

The TD-23 can be used for point to point or multidrop applications connecting equipment supporting either an RS-232/V.24 or RS-422/485 interface. The modem is designed for 2- or 4-wire leased lines and meets the ITU-T V.23 standard. Half-duplex transmission is possible over 2-wire circuits and full duplex on 4-wire, in both cases data rates up to 1 200 bit/s are possible. The transmission level and receiver sensitivity of the TD-23 can be adjusted by DIP-switches which makes it possible to communicate over long distances on private lines despite poor line quality.

Data rate 1200 bit/s (V.23)
2-wire (half duplex),4-wire (full duplex)
Number of multidrop points,16 (typical value)
Transmission distance up to 25 km (15.5 miles)
Adjustable output signal level
Adjustable reception sensitivity
Transient protection on the line side
AC-/DC-supply
Tri-Galvanic isolation (interface/line/supply)
Optional relay output reflecting the transmitter carrier