Sailor 250 FleetBroadband, User Manual, Page: 280 / 288

Chapter Glossary:
264
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.
V
VoIP Voice over IP. The routing of voice conversations over the Internet
or through an IP-based network.
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.