COBHAM Sailor 250 FleetBroadband, Training Manual, Page: 13 / 270

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SAILOR FleetBroadBand
Training Manual
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1.2 Beam types
Each Inmarsat-4 satellite provides the following beams /coverage.
1.2.1 Global Beam
Global beams:
Figure 1-3: EMEA Figure 1-4: APAC Figure 1-5: AMERICAS
The Global beams are used only for tracking signal and Bulletin
Board transmissions from Inmarsat.
There are only one Global beam from each satellite.
1.2.2 Regional Beams
Regional beams:
Figure 1-6: EMEA Figure 1-7: APAC Figure 1-8: AMERICAS
The Regional beams are used for registration after power up, Call
Announcements and Call set-up when signed in.
The actual Regional beam is selected on basis of the GPS position
of the FleetBroadband.
When the FleetBroadband is in idle mode, it is “resting in the
Regional beam. Also if the FleetBroadband has a data session
up running, but is not transferring any data up or down, the
FleetBroadband is returned to Regional beam to free resources
for other users, though the network is aware of the allocated
channel, which will be given back as soon as a data transfer is
started again.
There are 19 Regional beams from each satellite, covering the
entire satellite footprint.