The crowd had barely made the floor this morning when interested parties began surrounding the Communications Specialities booth for a glimpse of its new 3620TX and 3621RX units for carrying composite video and stereo sound on fiber. The audio is DIP-switch configurable and the power connects on a captive screw connector. The tiny units are indicative of the shrinking size on this type of hardware from all the manufacturers. The 3620TX and 3621RX can send the signals on single-mode or multimode fiber.