| Cellular
Digital Packet Data (CDPD) provides wireless access to the
Internet and other public packet-switched networks over the
AMPS and TDMA cellular phone systems. CDPD is the original wireless
IP packet data standard, its definition was started in 1992
and the first commercial service was launched in 1995. CDPD
has matured into a widely available, stable wireless IP service.
It has extensive coverage in the USA, Canada, Mexico, Brazil,
New Zealand, Israel, China, and other locations.
A CDPD modem and CDPD service gives the mobile professional
wireless access to email, corporate databases and the Internet.
Compatibility with a wide variety of applications is assured
because CDPD is based on one of the most widely accepted networking
protocols. In addition to Internet and e-mail access, CDPD
service is used for Point of Sale (POS) transactions, credit
card authorizations, dispatch services, alarm monitoring,
telemetry, remote control and numerous other applications.
CDPD’s always on connection to the Internet gives the
user instant access to their data. CDPD service pricing plans
are usually based on data transferred or as a flat rate rather
than the time connected, so the costs are reasonable. CDPD
communications are secure thanks to the encryption used and
channel hopping, which make it extremely difficult to intercept
and interpret a transmission. CDPD packets use forward error
correction to reduce the effects of noise and RF interference
on the data transmission. CDPD also supports IPv6. CDPD service
has a data rate of 19.2 kbps, however some of this capacity
is used for error correction and system overhead. The user’s
data throughput will vary but often will be in the range of
10 kbps to 15 kbps.
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