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authentication and registration is completed allowing ISU-to-ISU communication without the gateway in the
loop.
C.4 Direct Internet Connection
The Iridium Direct Internet service allows users to connect to the Internet via the Iridium gateway without
having to sign up with an Internet service provider. This service utilizes a dedicated Apollo Server at the
Iridium gateway, which provides high-speed connectivity to the Internet and optimizes server-to-Iridium
modem communications. The dial-up networking setup is similar to the dial-up networking setup for landline
telephone. The only difference is that the dialed telephone number is an international number provided by
Iridium. Figure B3 illustrates how Iridium Internet (NIPRNet) call is routed.
Direct Internet service can be enhanced using Windows-based emulated point-to-point protocol (PPP)
called the Apollo Emulator. With the use of the Apollo Emulator software instead of Microsoft Windows® dial-
up networking, Direct Internet service can reduce connection time and improve data throughput. In addition,
the Apollo Emulator offers a feature called Smart Connect
TM
, which manages airtime by seamlessly connecting
and disconnecting a user through the Iridium system. Airtime charges accumulate only while the call is
connected. Improved effective data throughput is achieved through the use of user-transparent data
Figure D3.
Iridium Dial-Up Data Service.
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DAV Connectivity
