Direct Internet Connection; Figure 35: Iridium Dial-Up Data Service - Iridium NAL SHOUT ns User Manual

SHOUT ns/nsx User Guide Version D
Iridium modem actually dials and initiates a connection with the Iridium gateway through the
Iridium satellite constellation. Because the Iridium modem is requesting to establish a data
connection, the switch at the gateway routes the call through another modem. The modem at
the Iridium gateway then dials into and connects to another modem at the other end. Figure 35
illustrates how an Iridium dial-up data service call is routed. The handshaking and protocols
established between the modems are independent of the Iridium network.
For those ISU-to-ISU dial-up calls where data transmission delay is critical, such as the
application of TCP/IP protocol, DAV should be considered in the design. This option eliminates
the Iridium gateway once authentication and registration is completed, allowing ISU-to-ISU
communication without the gateway in the loop.

Figure 35: Iridium Dial-Up Data Service

D I C
IRECT NTERNET ONNECTION
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
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