Glossary
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T
TLS
Transport Layer Security. An updated, more secure, version of SSL.
U
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.
V
VoIP
Voice Over IP. The routing of voice conversations over the Internet or through an IP-
based network.
W
WLAN
Wireless Local Area Network