Glossary
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IP
Internet Protocol. The method or protocol by which data is sent from one computer to another
on the Internet.
L
LAN
Local Area Network
P
PAST
Person Activated Self Test. A test similar to the POST test, but activated by the user. The PAST
causes the system to reset.
PC
Personal Computer
PIN
Personal Identification Number. A secret numeric password shared between a user and a
system, used to authenticate the user to the system.
PoE
Power over Ethernet. A standard for combining power supply with transmission of data over
the Ethernet. The source unit "injects" power into the Ethernet cable and the power is "picked
up" at the connected device.
POST
Power On Self Test. A test sequence that runs every time the system is powered up or reset.
PUK
Pin Unblocking Key
R
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.
RFI
Radio Frequency Interference. A non-desired radio signal which creates noise or dropouts in
the wireless system or noise in a sound system.
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.
SSB
Single Side Band. A means of communications at sea. The range of SSB is up to several
thousand miles and calls between yachts are free. Some stations allow telephone calls, email
and some basic Internet services over SSB radio.
