Cellular Digital Packet Data (CDPD) is an open system definition that
uses digital transmission on analog cellular (AMPS) channels to
provide mobile packet-switched data services.
The purpose of CDPD is to provide mobile access to the services
available through standard connectionless data protocols such as
IP. CDPD could be considered to be a wireless extension to the
Internet that is available anywhere.
You can find a fair amount of information about CDPD from the
following sources:
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