User's Manual
4 Introduction – Mobitex network technology
Integrator’s Guide – RIM 902M OEM Radio Modem
Mobitex network technology
The Mobitex wireless network technology, developed by Eritel in 1984 for
Swedish Telecom, has become an international data communication standard.
Now managed by the Mobitex Operators Association (MOA), which controls
the specifications for this open standard, Mobitex is a secure, reliable, wireless
packet switching network specifically designed for wide-area wireless data
communications.
Mobitex networks are deployed around the world. The technology is presently
available in the following countries:
x
Australia
x
Germany
x
Singapore
x
Austria
x
Indonesia
x
Sweden
x
Belgium
x
Italy
x
Turkey
x
Canada
x
Korea
x
United Kingdom
x
Chile
x
Netherlands
x
United States
x
Finland
x
Norway
x
Venezuela
x
France
x
Poland
Mobitex networks in the United States, Canada, Korea, Chile, and Venezuela
operate in the 900 MHz range, and are therefore directly compatible with the
RIM 902M OEM radio modem. Currently, Mobitex networks in other countries
operate at other frequencies, such as 400 MHz.
Mobitex provides highly reliable, two-way digital data transmission. The
network provides error detection and correction to ensure the integrity of the
data being sent and received, and includes transmission acknowledgment.
The Mobitex network has a hierarchical structure that allows messages to be
routed from sender to receiver along the most direct path possible. Each radio
cell is served by an intelligent base station. Because intelligence is distributed
throughout the network, data is only forwarded to the lowest network node
common to the sender and the receiver. For example, one base station is able to
handle all traffic in its coverage area.
The network constantly monitors the location of the mobile users. As a mobile
moves from one area of coverage to another, base stations track its signals,
sending updated mobile location and status information to the network. If the
network goes down at any point in transmission, the message is held until
network service is restored. If the mobile receiver moves outside the coverage
area, the base station stores the data until coverage is re-established, then