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TCP/IP or Transmission Control Protocol
A connection oriented protocol designed for operation on the Internet. Considered to
be a common language between otherwise incompatible computers.
TFTP
Trivial File Transfer Protocol. The simplified version of FTP. It enables file transfers
between two computers over a network (see RFC 1350).
Transponder
Electronic device in a communication satellite receiving information from an earth
station and re-sending it after frequency conversion and amplification to earth
station(s) or consumers; there is generally one transponder per RF channel.
Tuner
An adjustment for variable selection or tuning of a center frequency or channel.
UDLR
UniDirectional Link Routing. Standardized mechanism for integrating unidirectional
links in the Internet (see RFC 3077).
UNICAST
Unicast is communication between a single sender and a single receiver over a
network. The term exists in contradistinction to multicast, communication between a
single sender and multiple receivers.
UPLINK
Communication link from an earth station to a satellite, supplying the information to be
rebroadcast by one or more transponder(s).
USB
Universal Serial Bus. Serial 4-wire bus architecture for peripheral I/O ports, that
autosenses up to 128 peripherals at a distance of 5 m (16.4ft.) and at a maximum data
rate of 12 Mbps.
VSAT
Very Small Aperture Terminal. This is normally a two-way satellite transmission
system.
WAN
Wide-Area Network. A data-communications network spread accross a wide
geographic area and incorporating a large number of users. A WAN often uses
transmission devices provided by common carriers. Examples of WANs include Frame
Relay, SMDS, and X.25.
Watchdog
Device or software being used to supervise a particular event and acting (for example
giving alarm) in the event of abnormal operation.
WEB/WWW
Short for World Wide Web.
Wireless
Transmission without a physical connection between stations.