Rudics Data; Short Burst Data (Sbd) - Iridium NAL SHOUT ns User Manual

SHOUT ns/nsx User Guide Version D
internet and optimizes server-to-Iridium modem communications. The dial-up networking
setup is similar to the dial-up networking setup for a landline telephone. The only difference is
that the dialed telephone number is an international number provided by Iridium. Figure 35
illustrates how an Iridium internet 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™, 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 compression.
The channel rate is still 2.4 kbps. However, 10 kbps effective throughput can be achieved
depending on content (graphics and images result in lower effective throughput).
RUDICS D
ATA
Router-based unrestricted digital internetworking connectivity solution (RUDICS) is an
enhanced gateway termination and origination capability for circuit-switched data calls across
the Iridium satellite network. When an Iridium modem places a call to the RUDICS Server
located at the Iridium gateway, the RUDICS server connects the call to a predefined IP address,
allowing an end-to-end IP connection between the host application and the Iridium modem.
There are three key benefits of using RUDICS over the conventional PSTN circuit-switched data
connectivity or mobile-to-mobile data solutions: (1) elimination of analog modem training time,
(2) increased call connection quality, reliability, and maximized throughput, and (3) protocol
independence.
S B D (SBD)
HORT URST ATA
SBD is a simple and efficient bidirectional transport capability used to transfer messages with
sizes ranging from zero (a mailbox check) to 1960 bytes. SBD takes advantage of signals within
the existing air interface but without using the dedicated traffic channels. As a result, small
amounts of data can be transferred more efficiently than those associated with circuit-switched
data calls. Messages that originate from an Iridium modem can be delivered to a variety of
Document Number: 451-01037-001D 84 of 91