Glossary
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300 gigahertz including the frequencies used for communications signals (radio, television,
cell-phone and satellite transmissions) or radar signals.
S
SAS
Satellite Access Station. The gateway between the satellites and the worldwide networks such
as Internet, telephone network, cellular network etc.
SDU
Service Data Unit. Also known as a data packet.
SIM
Subscriber Identity Module.The SIM provides secure storing of the key identifying a mobile
phone service subscriber but also subscription information, preferences and storage of text
messages.
SMS
Short Messaging Service
Streaming
A technique for transferring data - such as audio or video clips - so that it is processed as a
continuous stream. With a Streaming connection you are charged by the minute, like for a
telephone connection.
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
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.
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.
Summary of Contents for Explorer 727
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