Chapter 1: Introduction
22 Aero services — background information
maximum bit rate is 2.4 kbps. The fax or modem can be connected to the
2-wire interface. If a fax or modem uses a channel, this channel cannot be
used for voice at the same time.
Classic Aero also provides a low speed packet data mode, which allows
data transfers at up to 1.2 kbps. This service can be used by an AFIS
(Automatic Flight Information Service), ACARS (Aircraft Communication
Addressing & Reporting System) or CMU (Communications Management
Unit) to send data over the satellite link. Note, however, that this service
must not be used as the basis for safety communication.
Swift64 data service
The 64 kbps UDI (Unrestricted Digital Information) service enables bi-
directional transmission of data to and from terrestrial 64 kbps ISDN
networks. The 56 kbps Data service is similarly used to make a connection
to 56 kbps ISDN networks, which are primarily used in North America.
The Speech and 3.1 kHz audio services make it possible to establish high
quality analogue connections with quality equal to terrestrial analogue
connections via digital networks/switches. The Speech service is used for
high quality voice connections, whereas 3.1 kHz audio can be used to
transfer analogue signals between fax machines and modems with an
analogue 2-wire interface. The 3.1 kHz audio service is transparent, and is
suitable for all analogue applications including secure telephones.
The MPDS service is a packet data service where the tariff depends on the
amount of data transmitted. This service is a more cost-effective solution
for web browsing, and other applications where there is no need for
constant transmission of data in both directions. It is also suitable for
applications where a constant connection is required, because the user is
no longer charged the “per minute rate”.
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