System Description - Furuno Felcom 30 Operator's Manual

9.

SYSTEM DESCRIPTION

Inmarsat Fleet F33
The Inmarsat Fleet F33 system provides 4.8 kbps voice communications service
and 9.6 kbps data transmissions to and from mobile/fixed subscribers anywhere
within the worldwide coverage of the Inmarsat 3 spot Beam system, see
"Satellite Coverage Map" on page 3-4.
The benefit of the INMARSAT system is its high capacity, and the rapid and
reliable connection between the land based (fixed) users and the Mobile Earth
Stations (MESs).
Each satellite region is under the control of a Network Coordinating Station
(NCS), which controls and monitors the traffic between the MESs and the LESs.
NCS: Network Coordinating Station, one in each Ocean Region (supervises all
messages and signals sent in the Inmarsat system).
LES: Land Earth Station w/Net service providers interconnects fixed
telecommunication networks with the Inmarsat system.
MES: Mobile Earth Station (FELCOM 30, user terminal for the Inmarsat system).
TELEPHONE
NETWORKS
LES
DATA
NETWORKS
MES
Overview of the Inmarsat system.
NCS
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