Ultra-Miniature Async Short Range Modem

RAD's SRM-3A is an ultra-miniature asynchronous short range modem connecting full duplex asynchronous terminals to computers. Using 24 AWG and operating at 9.6 kbps, it has an extended range of 4.5 km/2.8 miles. It typically operates at data rates up to 19.2 kbps.

• Ensures integrity of data transmission over unconditioned 4-wire dedicated lines

 

The SRM-3A is an ultra-miniature asynchronous short range modem connecting full duplex asynchronous terminals to computers. Using 24 AWG and operating at 9.6 kbps, it has an extended range of 4.5 km/2.8 miles. It typically operates at data rates up to 19.2 kbps.

 

The combination of the modem’s miniature size and the use of a 9-pin D-type connector makes it particularly suitable for PCs, for connecting laptop computers to a mainframe and for UNIX systems such as Unisys U6000/50.

The SRM-3A is coupled to the line through isolation transformers for protection against AC or DC overvoltages. SRM-3A operates without external power by drawing low power from the DTE data and control signals. The modem will operate fully even if only Transmit Data is connected, i.e., without any control signals.

 

The modem connects to the DTE via a 9-pin connector, male or female. Connection to the line is via a 4-screw terminal block, RJ-11 jack or RJ-45 jack.