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PPP ........................................................................................................... Point-to-Point-Protocol
Protocol
*A defined set of communications standards which lay down the parameters to
which all users must abide. Protocols in general use are X.25 and X.400.
PS......................................................................................................................... Packet Switched
PSDN ............................................................................................Packet Switched Data Network
PSTN ................................................................................... Public Switched Telephone Network
PSU..................................................................................................................Power Supply Unit
PUK ..............................................................................................................PIN Unblocking Key
R
RAM...................................................................................................... Random Access Memory
REC .......................................................................................................................Receiving level
ROM...............................................................................................................Read Only Memory
RX...................................................................................................................... Receive/Receiver
S
SAS ........................................................................................................... Satellite Access Station
SCA .......................................................................................................... Service Centre Address
SDM..................................................................................................... System Definition Manual
SIM.....................................................................................................Subscriber Identity Module
SMS ........................................................................................................... Short Message Service
SOLAS ..........................................................................................................Safety of Life at Sea
Space segment........................... Consists of the communications satellites operated by Inmarsat
Special access code
*A destination address code used in a ship-to-shore or shore-to-ship message to
access a special service provided by a service provider. The two-digit codes are
examples of special access codes.
SYNC ................................................................................................................... Synchronization
T
TDM ...................................................................................................... Time Division Multiplex
*The process by which multiple signals can share the same communication channel,
each using a different time slot.
TDMA ......................................................................................... Time Division Multiple Access
*The process by which MESs communicate with an SAS or NCS.
TX.................................................................................................................Transmit/Transmitter
U
USB............................................................................................................... Universal Serial Bus
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Appendix I Glossary
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