Product Specs

Packet Modem Spec Rev6.doc 3 06/09/00
1.1.1 Space Segment
The Space Segment is comprised of 48 LEO Satellites (and 8 additional in
orbit spares) built by Loral Space Systems and operated by Globalstar LP in
San Jose, CA.
The advantages of a LEO satellite over MEO / GEO’s is the minimal delay,
multi satellite handoff, extremely small antenna, lower power consumption,
very small delay (~250 ms or comparable to terrestrial digital cellular), and
the cheaper cost to the user.
1.1.2 Ground Segment
The Ground Segment is comprised of Earth Stations, called Gateways that
provide service in specific geographical areas. The Gateways are deployed
worldwide and communicate via C Band frequencies to / from the LEO
Satellites which serve as “bent pipe” transponders.
The User Terminal (Phones and Modem Modules) communicate to / from the
Gateway ground station using L and S band Frequencies, via the LEO
satellites.