Black Box SM966A DB9 A/B Switch Card

Control DB9 routing with a card designed for operational stability. The Black Box SM966A latching A/B switch card lets you switch between two DB9 connections while retaining the selected state if power is lost. That behavior matters in environments where a transient outage should not change the active path. Built for the Black Box Pro Switching System Plus Chassis, this card occupies one slot and connects through the chassis architecture, keeping the installation organized and scalable. The product description notes three DB9 interfaces/ports and a design intended for switching network applications, including backup systems and managed access workflows. For teams that need deterministic serial switching rather than ad hoc cabling, this card provides a controlled way to route connections inside a chassis-based system. The 1-year warranty and U.S. origin further support procurement requirements where traceability and support terms are part of the decision.