COBHAM explorer 727, User Manual, Page: 173 / 179

Glossary
98-126882-F 166
U
UDI Unrestricted Digital Information
UDP User Datagram Protocol. One of the core protocols of the Internet protocol suite. UDP
delivers data fast, because it avoids checking data packets. Time-sensitive applications
often use UDP because dropped packets are preferable to delayed packets.
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
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.
X
X-Stream
BGAN X-Stream™
is Inmarsat’s premium IP streaming service. It guarantees streaming
data rates from a minimum of 384 kbps up to approximately 450 kbps, on demand.
X-Stream
is a usage mode of the EXPLORER 727 terminal in which you can take
advantage of Inmarsat’s BGAN X-Stream service and of full coverage for the services that
are normally limited by the elevation angle to the satellite.