Furuno Felcom 50 Operator's Manual page 192

8. LIST OF TERMS
NCS Network Coordination Station, station that supervises all messages and
signals sent in the Inmarsat system; one in each Ocean Region.
OID Originating terminal IDentification.
Ocean Region the coverage area of an Inmarsat satellite within which
FELCOM 50 may communicate.
PABX Private Automatic Branch Exchange.
PIN Personal Identification Number.
POR Pacific Ocean Region.
PPP Point-to-Point Protocol, protocol used for serial data communication via the
FELCOM 50 RS-232 or USB port.
PUK Personal Unblocking Key, code that allows unblocking a SIM card.
RF Radio Frequency.
R LES Regional Land Earth Station sets terminal in MPDS list.
S/A operator StandAlone operator who maintains connectivity in the event of
Network Coordinating Station failure.
SBS Shared Base Station assigns channels to the MPDS user and handles the
MPDS communication.
SIM Subscriber Identity Module.
SMS Short Message System.
Spot Beam an Ocean Region is divided into sub-regions, each "spotlighted" by
a beam from the region satellite.
Terrestrial Network a fixed telecommunications network, such as a telephone
network or a data network, which connects to the Inmarsat system at an
LES/NCS.
UDI Unrestricted Digital Information.
USB Universal Serial Bus.
UTC Coordinated Universal Time, referenced to Greenwich Mean Time (GMT).
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