APPENDIX 2 LIST OF TERMS AND ABBREVIATIONS
AP-7
PS Packet Switching. A method of communication that separates data into small units
(packets) and sends them individually.
PUK PIN Unblocked Key. If the PIN is entered incorrectly 3 times the SIM card is
blocked. Use the PUK code to unblock the SIM.
RF Radio Frequency. Electromagnetic wave frequencies between about 3 kilohertz
and about 300 gigahertz including the frequencies used for communications sig-
nals (radio, television, cell-phone and satellite transmissions) or radar signals.
RX Receive
SIM Subscriber Identity Module. An IC card that stores the registered users subscriber
number, phone number and information. When inserted into a terminal, the termi-
nal operates on this information.
SMS Short Message Service. A method of sending short messages over mobile devic-
es.
Streaming A method transmitting audio, visual and multimedia where the data is transmitted
and played back simultaneously.
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 suit-
able for applications like file transfer and e-mail.
TCP/IP Transmission Control Protocol/Internet Protocol. TCP/IP is a suite of communica-
tion protocols used to interconnect network devices on the internet.
TX Transmit
UDI Unrestricted Digital Information. ISDN terminology for the transmission capacity of
data, video conferences, and G4 fax machines.
UDP User Datagram Protocol. UDP is an alternative communications protocol to Trans-
mission Control Protocol (TCP) used primarily for establishing low-latency and
loss-tolerating connections between applications on the internet.
URL Uniform Resource Locator. Specifies where an identified resource is available and
the mechanism for retrieving it. In popular language, a URL is also referred to as
a Web address.
UTC Coordinated Universal Time. The International Atomic Time (TAI) with leap sec-
onds 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.
VPN Virtual Private Network. A computer network in which some of the links between
nodes are carried by open connections or virtual circuits in some larger networks
(such as the Internet), as opposed to running across a single private network.
WAN Wide Area Network. Using a telephone line or dedicated line two connect two or
more computers in a geographically different location.
Term Meaning
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