
4
1
Chapter 1
Inmarsat Network
1.2.3 Narrow Beams
Narrow beams:
Figure 1-9: EMEA
Figure 1-10: APAC
Figure 1-11: AMERICAS
The Narrow beams are used for the actual communication, data,
voice and fax. The communication is taking place on a shared
channel, which can be the reason for a lower throughput that
expected.
The actual Narrow beam is selected on basis of the GPS position
of the FleetBroadband.
There are >200 Narrow beams from each satellite, covering the
entire satellite footprint.
1.2.4 Beam Hierarchy
When a BGAN-X is terminating its traffic connection in a Narrow
Beam, it is immediately transferred back to the Regional Beam.
When the last BGAN-X has left a Narrow Beam, the Forward
Carrier in that beam is removed and the Forward and Return
Channels are returned to the pool of free satellite capacity.
To avoid congestion in Narrow Beam by idle IP connections, the
RNS will also time-out a variable bit rate connection if no packets
are exchanged for a period of time and then hand back the
BGAN-X to the Regional Beam. If packets subsequently arrives
at the BGAN-X or the RNS for this connection, then the satellite
channels are immediately allocated in the Narrow Beam (if they
are not already there), and the BGAN-X is returned to the Narrow
Beam and the connection is restored, ready to exchange traffic.
The BGAN-X does not need to use a keep-alive mechanism to
keep the connection open.
Содержание Sailor 250 FleetBroadband
Страница 1: ...FleetBroadband Installation Training manual Commissioning and On Board repair ...
Страница 2: ......
Страница 4: ......
Страница 9: ...Inmarsat Network ...
Страница 10: ......
Страница 34: ...24 1 Chapter 1 Inmarsat Network Figure 1 34 Return direction connection bearers ...
Страница 36: ......
Страница 37: ...Product Presentation ...
Страница 38: ......
Страница 70: ......
Страница 71: ...Installation ...
Страница 72: ......
Страница 107: ...97 SAILOR FleetBroadBand Training Manual 3 ...
Страница 108: ......
Страница 109: ...Interfaces ...
Страница 110: ......
Страница 132: ......
Страница 133: ...Repair ...
Страница 134: ......
Страница 165: ...155 SAILOR FleetBroadBand Training Manual 5 Figure 5 59 ...
Страница 174: ...164 Chapter 5 Troubleshooting 5 Example Terminal LED steady green Antenna LED steady green Figure 5 77 Figure 5 78 ...
Страница 178: ...168 Chapter 5 Troubleshooting 5 Example GPS module defective Figure 5 86 Figure 5 87 Figure 5 88 Figure 5 89 ...
Страница 186: ......
Страница 187: ...Removal Replacement ...
Страница 188: ......
Страница 217: ...207 SAILOR FleetBroadBand Training Manual 6 ...
Страница 218: ......
Страница 219: ...Software Upload ...
Страница 220: ......
Страница 221: ...211 SAILOR FleetBroadBand Training Manual 7 Figure 7 1 ...
Страница 230: ......
Страница 231: ...System Test ...
Страница 232: ......
Страница 236: ......
Страница 237: ...Abbreviation ...
Страница 238: ......
Страница 242: ......
Страница 243: ...R R of EXP 727Antenna ...
Страница 244: ......
Страница 255: ...245 SAILOR FleetBroadBand Training Manual 10 ...
Страница 256: ......
Страница 257: ...R R of EXP 325Antenna ...
Страница 269: ......
Страница 270: ...TT 100 MSO 030207 www cobham com satcom ...