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These alternatives include geo-synchronous satellites paired with earth-bound uplinking and downlinking technologies, low earth orbit satellites, terrestrial wireless microwave systems (e.g., MMDS, LMDS), T-Carriers, cable, and fiber optic.
T-Carriers are a family of technologies that require the use of a dedicated digital communications line and specialized computer equipment at both the user's site and at the site of the company that provides the service.
You must be acquainted with transmission media, including microwave radio, fiber optics, coax, twisted pair, T-carrier, infrared, and satellites; local area networks (LANs); time-division multiplexers (TDMs); network control centers (NCCs); wiring, networking, software, and numerous other areas that have risen in the past half-dozen years.
The move toward an all-ditital network began in 1962 in metropolitan areas with the introduction of T-carrier lines, which transmitted 24 digitized conversations on two twisted pairs of existing telephone cables at about 1.5 megabits per second for distances up to about 50 miles.