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Appendix I Glossary
ITU .................................................................................International Telecommunication Union
K
Kbytes .......................................................................................................................... 1024 bytes
L
LCD ........................................................................................................... Liquid Crystal Display
LED ............................................................................................................. Light Emitting Diode
LMSS..............................................................................................Land Mobile Satellite Service
LNA ............................................................................................................. Low Noise Amplifier
LT ................................................................................................................................ Local Time
M
MES.............................................................................................................. Mobile Earth Station
*The generic name used to describe an Inmarsat-approved terminal which is
allowed to access the network, and applicable to both maritime and land mobile
communications.
Message channel
*A channel assigned by the NCS for an MES to send a message through an SAS
to its required destination.
Modem .................................................................................................MODulator/DEModulator
*A device used to transmit digital data, by converting (modulating) a digital
signal into an analogue form and re-converting (demodulating) the analogue
signal into digital form at the receiving end.
MSISDN .................................................................................................Mobile Subscriber ISDN
N
NCS Common Signaling Channel
*Also known as the NCS Common Channel. A TDM channel used by the
NCS to transmit system information and message announcements to MESs.
NMEA ...........................................................................National Marine Electronics Association
O
Ocean Region
*The coverage area of an Inmarsat satellite within which an MES may send and
receive messages.
OSC ................................................................................................................................Oscillator
P
Packet
*An envelope or block of data sent over a network; each packet contains
addressing information as well as the data being sent.
PC ....................................................................................................................Personal Computer
PDP...............................................................................................................Packet Data Protocol
PIN............................................................................................... Personal Identification Number
POR .............................................................................................................Pacific Ocean Region
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