Glossary
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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
VPN Virtual Private Network. A network that is constructed by using public wires to connect
nodes. You can create networks using the Internet for transporting data, using security
mechanisms so that only authorized users can access the network.
W
WAN Wide Area Network. A telecommunications network or computer network that extends
over a large geographical distance. In this manual, WAN is the external network via BGAN
or cellular connection, whereas LAN is used for the local connection of equipment to the
terminal.
WLAN Wireless LAN. A wireless computer network that links two or more devices using a wireless
distribution method (often spread-spectrum or OFDM radio) within a limited area such as
a home, school, computer laboratory, or office building.
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