KVH Industries FB250, Руководство по установке, Страница: 195 / 202

Glossary
182
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.
SMA SubMiniature version A. A coaxial RF connector developed as a
minimal connector interface for coaxial cable with a screw type
coupling mechanism. The connector has a 50 Ohm impedance.
SMS Short Message Service
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.
T
TFTP Trivial File Transfer Protocol. A very simple file transfer protocol,
with the functionality of a very basic form of FTP. Since it is so
simple, it is easy to implement in a very small amount of memory.