Glossary
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S
SBB SwiftBroadband. Simultaneous voice and broadband data up to
432kbps per channel.
SMS Short Messaging Service
STU Secure Telephone Unit
SW Software
T
TCP Transmission Control Protocol. One of the core protocols of the
Internet protocol suite. TCP provides reliable, in-order delivery
of a stream of bytes, making it suitable for applications like file
transfer and e-mail.
U
UDI Unrestricted Digital Information
UTC Coordinated Universal Time. The International Atomic Time
(TAI) with leap seconds added at irregular intervals to
compensate for the Earth’s slowing rotation. Leap seconds are
used to allow UTC to closely track UT1, which is mean solar
time at the Royal Observatory, Greenwich.
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