1. Inmarsat Service systems
1-2
1.1.2 The Inmarsat FleetBroadband System
The Inmarsat network system consists of NCS, NOC, SCC, TT&C, and SAS.
Functions of each facility are as follows:
1) Network Coordination Station (NCS)
The NCS assigns communication channels between the Mobile Earth Stations (MES) and Satellite
Access Station (SAS).
2) Network Operation Center (NOC)
The NOC located at the INMARSAT headquarters in London U.K., coordinates communication
lines of the network 24 hours a day, 365 days a year. The NOC maintains contact via dedicated
satellite and terrestrial links with the NCSs and SASs in all Ocean regions.
The NOC performs the following:
・Coordination with the Satellite Control Center (SCC) for operation of satellites.
・Coordination with NCS and/or SAS for system operation.
・Collection of any status data in operation .
・Coordination of any test of satellite’s performance.
3) Satellite Control Center (SCC)
The SCC controls the positioning of the satellites above the equator.
4) Tracking Telemetry and Control Center (TT&C)
The TT&C supplies data on the status of the Inmarsat satellites to SCC.
5) Satellite Access Station (SAS)
The SASs located in Fucino (Italy), Burum (Holland) and Hawaii (America) which are the gateway
systems operating inter-working with public network (including telephone and Internet).
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