The C.A. Designs OPTO-KM electrically-isolated PC keyboard and serial or PS/2 mouse extender system enables a personal computer to be operated with both an IBM keyboard and mouse remote (up to 300m) from the system unit.

The OPTO-KM is comprised of two modules connected by up to 300m of category 5 (4-pair) UTP or FTP cable. This typically allows the transport of PC keyboard and mouse signals within electrically noisy environments using twisted-pair cables to remote keyboards and mice.

Each link has a line-driving module and line-receiving module.

The Line-Driving Module:
... transforms the keyboard and mouse signals into a format suitably matched to level 5 UTP or FTP cable via an optically-isolated interface.

The Line-Receiving Module:
... reconstructs the keyboard and mouse signals from the transmission line into a compatible output signals for an appropriate keyboard and serial or PS/2-style mouse.

These units may take their power from an external power supply which may be situated at either end of the twisted-pair line.

Interconnecting Cable
The twisted-pair cable used must be Category 5 grade UTP / FTP cable, terminated with RJ45 connectors to the EIA568 standard.  Foil screening is recommended for optimum EMC.

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