1. INMARSAT C SYSTEM OVERVIEW
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Inmarsat-C system configuration
The Inmarsat C system consists of the Operation Control Center (OCC), Satellite Con-
trol Centers (SCC), Network Coordination Stations (NCS), Land Earth Stations (LES)
and Mobile Earth Stations (MES). The OCC, located at Inmarsat’s London headquar-
ters, coordinates a wide range of activities in the Inmarsat system, including commis-
sioning of mobile earth stations.
The Inmarsat C system divides the world into four regions and each region is covered
by its own satellite.
Inmarsat system satellites
In each region there is one NCS and several LESs. The NCS keeps track of all Inmar-
sat C transceivers in its region and broadcasts information such as navigational warn-
ings, weather reports and news. The LESs provide the link between the MES and the
terrestrial telecommunications networks via satellite.
Region Satellite Satellite position
AOR-West I-4 F3 AMER 98.4°W
AOR-East I-3 F5 AORE 54.0°W
IOR I-4 Alphasat EMEA 25.0°E
POR I-4 F1 APAC 143.5°E
Satellite
AOR-West AOR-East IOR POR
Same as left Same as left Same as left
0.0 m
-/+: To set option
0.0 m
-/+: To set option
0.0 m
-/+: To set option
MES
OCC: Operation Control Center
SCC: Satellite Control Center
NCS: Network Coordination Station
MES: Mobile Earth Station
LES: Land Earth Station
LES
LES
LES
NCS
SCC
OCC
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