256-Channel Crosspoint Matrix/Multiplexer Switch Module for SCXI—The SCXI-1129 is ideal for high-channel-count switching applications. For greater densities, you can easily achieve matrix expansion with additional modules. Analog signals are passed between modules through a high-voltage backplane, a matrix expansion cable, and through analog plugs connecting terminal blocks that simplify wiring. The SCXI-1129 supports both low and high voltage levels.