The Black Box ACX1T-12A-SM is a compact fiber-optic KVM extender transmitter from Black Box’s DKM HD Video and Peripheral Matrix Switch series. It’s designed to extend high-quality DVI-D video, USB HID peripherals, and audio/serial signals from a computer or server to a remote console over long-distance single-mode fiber, either as part of a DKM matrix switching infrastructure or in standalone point-to-point applications.