High Speed Interconnects (HSI) is an American company which extrudes and assembles high-performance coaxial cables. HSI’s low-loss, low-capacitance, phase-stable, coaxial interconnect solutions are available in a variety of cable constructions, which include circular and micro coaxial connector terminations down to 0.3 mm pitch; and fine wire, direct-to-board terminations down to 0.175 mm.