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PSTN ............................................................................Public Switched Telephone Network
PSU............................................................................................................ Power Supply Unit
PVT ........................................................................................ Performance Verification Test
R
RAM................................................................................................ Random Access Memory
RCC...........................................................................................Rescue Coordination Center
RDB ................................................................................................... Remote Distress Button
REC .................................................................................................................. Receiving level
ROM........................................................................................................ Read Only Memory
RX................................................................................................................. Receive/Receiver
S
SafetyNET
The international service for the broadcasting and automatic reception of MSI through
Inmarsat EGC system. SafetyNET receiving capability is part of the mandatory
equipment which is required to be carried by certain ships under the provisions of
chapter IV of SOLAS Convention 1974, as amended.
SAR ........................................................................................................... Search and Rescue
Satellite coastal warning area
A unique and precisely defined sea area within a NAVAREA/METAREA or Sub-Area
established by a coastal state for the purpose of co-ordinating the broadcast of coastal
maritime safety information through the SafetyNET service.
SDM...............................................................................................System Definition Manual
SFU....................................................................................................Store and Forward Unit
Signaling channel (MES - LES):
A random access TDMA channel, used by an MES to transmit signaling information and
data to an LES.
Signaling channels (MES - NCS):
A random access TDMA channel, used by an MES to transmit signaling information and
data to an NCS.
SLCA.................................................................................Slot Logical Channel Assignment
SOLAS ..........................................International Convention for the 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
SYNTH...................................................................................................................Synthesizer
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 LES or NCS.
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