data communications equipment and related computer software; namely, intelligent local-area network (LAN) concentrators for centralizing LAN connections in one enclosure; fiber-optic backbone multiplexers for combining large numbers of slow-speed signals from digital voice channel banks, computers, or local-area networks onto a single, high-speed fiber-optic transmission line; network accessories; namely, patch cables, fiber-optic modems, and fiber-optic multiplexers; and computer software fo...