COBHAM Sailor 250 FleetBroadband, Training Manual, Page: 16 / 270

6
1
Chapter 1
Inmarsat Network
Elevation bands:
Figure 1-13: EMEA Figure 1-14: APAC Figure 1-15: AMERICAS
End users will also experience that the number of users sharing
the bearer, at any particular time, will have an impact on the
achievable bit rate, along with at low elevation angles for a
specific terminal/link conditions. Each 512 kbps bearer needs to
accommodate some system overheads, meaning the maximum
theoretical bandwidth available for users will be 432 kbps. As has
been said previously, many actors will influence the achieved bit
rate experienced by end users.
Max. bit rate,
downlink
Max. bit rate,
uplink
SAILOR 500
FleetBroadband
432 kbps 432 kbps
SAILOR 250
FleetBroadband
284 kbps 284 kbps
SAILOR 150
FleetBroadband
150 kbps 150 kbps
Figure 1-16: Maximum bit rate
The BGAN-X network maximises the use of this satellite capacity
by dynamic re-allocation to meet the demand, to ensure bandwidth
is always available when and where the users need it.
1.3 BGAN-X units
1.3.1 BGAN-X Terminal classes and capabilities
The BGAN-X system supports a range of FleetBroadband types
with differing capabilities. The BGAN service is launched with
three FleetBroadband classes, all maritime devices, i.e. tracking
units automatically pointing towards the satellite during use.
The
Class 8 system (SAILOR 500 FleetBroadband) is a high
performance terminal with a large antenna (16 patches (the old
antenna has 19 patches)) supporting the maximum data rates.
The
Class 9 system (SAILOR 250 FleetBroadband) is the same
terminal as SAILOR FB500 but has a somewhat smaller antenna
(three helixes) and can support marginally lower data rates.
The
Class 14 system (SAILOR 150 FleetBroadband) has an even
smaller antenna (two helixes) supporting the lowest data rates.