Glossary
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BGAN services
P
PBX Private Branch Exchange, telephone exchange that serves a particular business or office.
PIN Personal Identification Number. A code number used to provide access to a system that
has restricted access.
PPPoE Point-to-Point Protocol over Ethernet. A network protocol for encapsulating Point-to-
Point Protocol (PPP) frames inside Ethernet frames. By using PPPoE, users can virtually
"dial" from one machine to another over an Ethernet network, establish a point to point
connection between them and then securely transport data packets over the connection.
R
RF Radio Frequency. Electromagnetic wave frequencies between about 3 kHz and about
300 GHz including the frequencies used for communications signals (radio, television,
cell-phone and satellite transmissions) or radar signals.
S
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.
SIP Session Initiation Protocol. An application-layer control (signaling) protocol for creating,
modifying, and terminating sessions with one or more participants. Used e.g. for Internet
telephony.
T
TE Terminal Equipment - the equipment connected locally to the terminal.
U
USB Universal Serial Bus. A specification to establish communication between devices and a
host controller (usually personal computers). USB is intended to replace many varieties of
serial and parallel ports. USB can connect computer peripherals such as mice, keyboards,
digital cameras, printers, personal media players, flash drives, and external hard drives.
UTC Coordinated Universal Time. The International Atomic Time (TAI) with leap seconds
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