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PUK PIN Unblocking Key. An eight-digit code used to unblock a SIM
card after three incorrect PINs have been entered. The PUK code
is supplied with the SIM card.
Q
QoS Quality of Service
R
RDI Restricted Digital Information
RF Radio Frequency. Electromagnetic wave frequencies between
about 3 kilohertz and about 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.
BGAN-X_UM.book Page 190 Wednesday, April 30, 2008 12:48 PM