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1.1 System Overview
The Inmarsat system divides the world into four regions and each region is covered by its
own satellite. The regions are Atlantic Ocean Region-East (AOR-E), Atlantic Ocean
Region West (AOR-W), Pacific Ocean Region (POR), and Indian Ocean Region (IOR).
The system consists of the bodies shown in the figure below. Each region has its own
SCC (Satellite Coordination Center), NCS (Network Coordination Station), and several
LES (Land Earth Stations).
The OCC is the nerve center of the system and is located at Inmarsat's London
headquarters.
The OCC provides round-the-clock coordination of all functions in the Inmarsat system.
OCC
NCS
SCC
LES LES LES
Same as left
Satellite
MES
Same as left
Same as left
AOR-W
Atlantic Ocean Region-West
AOR-E
Atlantic Ocean
Region-East
IOR
Indian Ocean
Region
POR
Pacific Ocean
Region
OCC: (Operation Control Center)
SCC : (Satellite Control Center)
NCS : (Network Coordination Station)
LES : (Land Earth Station), same as CES
MES: (Mobile Earth Station), same as SES
Figure 1-1 Inmarsat Bodies
Chapter 1 Inmarsat System
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