Profile: Packet Data Systems Ltd specializes in communications test solutions. We manufacture a range of ISDN network simulators. Freelink demo is a 2 port analog exchange simulator. It can be used to connect any dial up devices such as modems, telephones or fax machines just as if they were connected to the real PSTN network. Operation is fully automatic, it detects the first device coming off-hook and supplies it with dial tone for about 5 seconds during which it may dial any number, either pulse or tone. The other port then rings automatically until it is answered. The devices are then connected for speech or data until they ring off and it resets itself. The optional audio socket provides an off-hook switch & a standard audio socket for connection to hi-fi or other recording and playback systems.