Product information:

2 port analogue phone line simulator.

MD9940 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, the MD9940 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.