The MESA Series Expansion Systems make it possible to build large matrix or multiplexer configurations using a MESA Control Unit to control the required number of Expansion Chassis from one Control Module. These Chassis can be any combination of different types of Expansion Chassis, including the CXAR, CX, LX, HXV, VX, and PX Matrices; JX Multiplexers, GX and RS Group Switches, VDX Video Switches, FX and FO Fiber Optic Switches, HDX 4600 High Density Matrices and the DX Digital Matrices.