FINAL REPORT - Stakeholders - Ofcom

Figure 5-2: Boeing Connexion system segments
The ground earth station segment is connected to the NOC segment with redundant highspeed
data connections. Multiple ground earth stations and NOCs may be included in the
system for redundancy.
5.9.2.3 Uplink
The connection from the ground up to the satellite will employ up to four transponders
(carriers), with uplink data rates of between 5 and 10 Mbps per transponder. The system
uses a direct sequence spread spectrum (DSSS) waveform to minimize interference.
Figure 5-3: Data uplink via transponders (carriers) in Boeing Connexion system
Each aircraft will be capable of receiving four transponders from the satellite for a total
data rate of between 20 and 40 Mbps. Each forward link signal transmitted to the aircraft
carries an IP packet stream of video and data content.
Packets are unicast, multicast or broadcast to aircraft in the transponder coverage region.
An onboard router accepts only those packets addressed to that aircraft and routes the
packets to passengers via the onboard LAN.
Page 175