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 novel conversion coating composition and a method for treating corroded eel surfaces to convert them into a suitable substrate for accepting organic coatings are provided. Corroded steel surfaces treated with the novel composition of this invention by the improved method of application disclosed in this invention show wet adhesion and salt spray resistance properties markedly superior to those of surfaces which were treated with conventional, prior-art, commercially available compositions.

Abstract: A novel conversion coating composition and a method for treating corroded eel surfaces to convert them into a suitable substrate for accepting organic coatings are provided. Corroded steel surfaces treated with the novel composition of this invention by the improved method of application disclosed in this invention show wet adhesion and salt spray resistance properties markedly superior to those of surfaces which were treated with conventional, prior-art, commercially available compositions.