The modem interception system is designed to intercept Modem communications between the Suspect and the Internet Service Provider.

The PSTN Data Monitoring System comprises of a serial tap and a decoding station. The serial tap is placed on the telephone line of the suspect. The serial tap is a high impedance circuit and the suspect will not notice any changes in the telephone line.

The PSTN Data Monitoring System is available in a single channel configuration.

It has a network option, using which multiple systems can be linked together and operated from a single location.