Black Box SM933C MKT-070-03643 A Switch Card

Black Box SM933C is a Pro Switching System II switch card with an RJ11 (4-WIRE) interface designed to install in a compatible Black Box chassis to route signal paths between lines. Identified in Black Box catalogs as SM933C and cataloged under MKT-070-03643 A, this card is part of the Pro Switching System II family, a modular switching platform that coordinates switching across multiple cards within a single chassis. The RJ11 (4-WIRE) connector configuration provides four conductors for the control signals that drive the switching matrix, allowing you to select among connected line paths as part of a configured system. The SM933C is used in conjunction with other Pro Switching System II cards to implement either individual card switching or multi-card gang switching, depending on the cabinet’s design and the accompanying controller functionality. In typical deployments, this card enables flexible, reconfigurable routing of signal paths within a multi-card setup, supporting rapid changes to the system’s connection topology without swapping hardware.