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.