Inmarsat I-4: Gateway to Broadband
Eighty-five per cent of the world's total landmass is now covered by Inmarsat's next-generation satellite system - the Inmarsat-4 (I-4) series.

The first two of three I-4 satellites are now in commercial operation in Inmarsat's Indian and Atlantic ocean regions, with coverage extending across North and South America, Europe, Africa, Asia and the Far East.  With the final satellite due for launch in August 2008.

Inmarsat's fourth-generation I-4 spacecraft are among the largest commercial communications satellites ever launched.

Together they usher in a new era, which we call 'Broadband for a Mobile PlanetTM', delivering simultaneous voice and data at speeds of about half a megabit per second.

Each I-4 is a veritable powerhouse compared with the Inmarsat-3 spacecraft, offering:

Greater call capacity than all five I-3s put together
- 60 times more power than any one of its predecessors
- 12 times greater efficiency in its use of radio spectrum
- 16 times the capacity
- 25 times the receiver sensitivity

The Inmarsat-4s, like their predecessors, are equipped with a single global beam allowing each to cover up to one-third of the Earth's surface, apart from the poles.

Each satellite also generates 19 wide spot-beams that provide continuous coverage across the same region for Inmarsat's existing high-end services, including Fleet F77 128kbps, Fleet F55 and F33, and maritime mini-M.

New to the I-4s are an additional 228 narrow spot-beams, designed to form the backbone of Inmarsat's broadband services, including the Broadband Global Area Network (BGAN), which was launched at the end of 2005.

BGAN delivers Internet and intranet content and solutions, video-on-demand, videoconferencing, fax, e-mail, phone and LAN access at speeds of up to 492kbps.

Together the first two I-4s serve about 98 per cent of the global population.
 
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