Abstract: An expandable matrix switching system for use in routing video and other signals transmitted over twisted pair cables from a variable number of inputs to a variable number of outputs, the matrix switching system including at least one switch frame having a plurality of input ports for receiving input signals and a plurality of output ports. Each switch frame including a processor for selectively coupling the input ports to one or more of the output ports in response to routing commands from a controller. Each switch frame also including a plurality of cascade output ports coupled to the input ports for cascading input signals to the corresponding input ports of another switch frame in the system. A plurality of the switch frames are connectable one to another providing a scalable matrix switch having a variable number of input ports and output ports controllable as a unitary matrix switch.

Abstract: A method for promoting oral hygiene and treating a patient for gingivitis, other periodontal problems, or oral mal odor by transmitting to the gums of a patient electrical current waveforms of electrical voltage within the range of from about ±0.1V to about ±3.9V as a combination of ultra-weak electrical currents.