A communications link up to about 300 feet for use between a computer and display unit receives analog R, G, and B signals from the computer and applies them to discrete current amplifiers that modulate signal current applied to discrete conductors of a 300 foot cable. Impedance matching networks match...http://www.google.com/patents/US5268676?utm_source=gb-gplus-sharePatent US5268676 - Computer-monitor extended range communications link
