Dial-Up Data Service; Figure 34: Iridium Network Data Capabilities - Iridium NAL SHOUT ns User Manual

SHOUT ns/nsx User Guide Version D

Figure 34: Iridium Network Data Capabilities

D -U D S
IAL P ATA ERVICE
Dial-up data service provides connectivity through the Iridium satellite network to another
Iridium modem, to the public switched telephone network (PSTN), to the Defense Switch
Network (DSN), to a remote LAN (e.g., a corporate network), or to an internet service provider
(ISP) at a nominal data rate of 2.4 kilobits per second (kbps). The connection time involving user
authentication and handshaking (or modem training) can range from 15 to 30 seconds. For an
Iridium-to-Iridium call, dial-up data service offers an additional option known as Data After
Voice (DAV). Similar to a voice call, a DAV call is routed directly from one Iridium modem to
another Iridium modem without going through the gateway.
The Iridium dial-up data service, as shown in Figure 35, functions in much the same way as the
PSTN dial-up connectivity. From the perspective of a computer, the Iridium modem is just
another external modem. The only difference is that the dialed telephone number must
conform to the international dialing pattern used by Iridium. When a data call is placed, the
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