"CDPD" redirects here. For British copyright law, see Copyright, Designs and Patents Act 1988.
This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations.(March 2013) (Learn how and when to remove this message)
Cellular Digital Packet Data (CDPD) is an obsolete wide-area mobile data service which used unused bandwidth normally used by Advanced Mobile Phone System (AMPS) mobile phones between 800 and 900 MHz to transfer data. Speeds up to 19.2 kbit/s were possible, though real world speeds seldom reached higher than 9.6 kbit/s. The service was discontinued in conjunction with the retirement of the parent AMPS service; it has been functionally replaced by faster services such as 1xRTT, Evolution-Data Optimized, and UMTS/High Speed Packet Access (HSPA).
Developed in the early 1990s, CDPD was large on the horizon as a future technology. However, it had difficulty competing against existing slower but less expensive Mobitex and DataTAC systems, and never quite gained widespread acceptance before newer, faster standards such as General Packet Radio Service (GPRS) became dominant.
CDPD had very limited consumer products. AT&T Wireless first sold the technology in the United States under the PocketNet brand. It was one of the first products of wireless web service. Digital Ocean, Inc. an original equipment manufacturer licensee of the Apple Newton, sold the Seahorse product, which integrated the Newton handheld computer, an AMPS/CDPD handset/modem along with a web browser in 1996, winning the CTIA's hardware product of the year award as a smartphone, arguably the world's first. A company named OmniSky provided service for Palm V devices. OmniSky then filed for bankruptcy in 2001 then was picked up by EarthLink Wireless. The technician that developed the tech support for all of the wireless technology was a man by the name of Myron Feasel he was brought from company to company ending up at Palm. Sierra Wireless sold PCMCIA devices and Airlink sold a serial modem.
Both of these were used by police and fire departments for dispatch. Wireless later sold CDPD under the Wireless Internet brand (not to be confused with Wireless Internet Express, their brand for GPRS/EDGE data). PocketNet was generally considered a failure with competition from 2G services such as Sprint's Wireless Web. AT&T Wireless sold four PocketNet Phone models to the public: the Samsung Duette and the Mitsubishi MobileAccess-120 were AMPS/CDPD PocketNet phones introduced in October 1997; and two IS-136/CDPD Digital PocketNet phones, the Mitsubishi T-250 and the Ericsson R289LX.
Despite its limited success as a consumer offering, CDPD was adopted in a number of enterprise and government networks. It was particularly popular as a first-generation wireless data solution for telemetry devices (machine to machine communications) and for public safety mobile data terminals.
In 2004, major carriers in the United States announced plans to shut down CDPD service. In July 2005, the AT&T Wireless and Cingular Wireless CDPD networks were shut down.
and 27 Related for: Cellular digital packet data information
CellularDigitalPacketData (CDPD) is an obsolete wide-area mobile data service which used unused bandwidth normally used by Advanced Mobile Phone System...
first digital networks, 1G and 0G were analog): GSM Circuit Switched Data (CSD) GPRS EDGE(IMT-SC) Evolved EDGE Digital AMPS CellularDigitalPacketData (CDPD)...
telecommunications, packet switching is a method of grouping data into packets that are transmitted over a digital network. Packets are made of a header...
In digital radio, packet radio is the application of packet switching techniques to digital radio communications. Packet radio uses a packet switching...
are a number of different digitalcellular standards, including: Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), cdmaOne...
data transmission are applied. Examples include second-generation (1991) and later cellular telephony, video conferencing, digital TV (1998), digital...
bundling of timeslots is used for circuit-switched data services (HSCSD) as well. Also called General Packet Radio Service or GPRS GPRS networks evolved to...
General Packet Radio Service (GPRS), also called 2.5G, is a packet orientated mobile data standard on the 2G cellular communication network's global system...
(UMTS) systems where packetdata transmission rates are much higher. In the UMTS system, the advantages of HSCSD over packetdata are even lower since...
Personal DigitalCellular (PDC) was a 2G mobile telecommunications standard used exclusively in Japan.[citation needed] After a peak of nearly 80 million...
Institute (ETSI) to describe the protocols for second-generation (2G) digitalcellular networks used by mobile devices such as mobile phones and tablets....
release of 2.5G phones with support for packetdata changed this. The 2.5G networks break both digital voice and data into small chunks, and mix both onto...
detection (erasure) probability Packet erasure channel, where packets are lost with a certain packet loss probability or packet error rate Arbitrarily varying...
High Speed Packet Access (HSPA) is an amalgamation of two mobile protocols—High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA)—that...
over a communication channel, such as Ethernet or packet radio, in a communication network. The data that these messages contain may be delivered over...
Enhanced Data rates for Global Evolution, is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension...
an innovative and first-to-market wireless datacellular network known as CDPD (CellularDigitalPacketData) that provided IP connections with mobility...
by NG-DECT/CAT-iq wideband voice and data. High-capacity packet (P80) – 900 or 904 bits, "double slot". This packet uses two time slots and always begins...
A data link is a means of connecting one location to another for the purpose of transmitting and receiving digital information (data communication). It...
provide combined circuit switched and packet switched data and voice services from the outset, usually at far better data rates than 2G networks with their...
a circuit-switched network, the digital information is packetized and transmission occurs as IP packets over a packet-switched network. They transport...
3G+ enhancements based on the high-speed packet access (HSPA) family, allowing UMTS networks to have higher data transfer speeds and capacity. 3G is able...
part of the general packet radio service (GPRS) which allows 2G, 3G and WCDMA mobile networks to transmit Internet Protocol (IP) packets to external networks...
transmit at higher data rates. Packet mode channel access methods select a single network transmitter for the duration of a packet transmission. Some...
analog, radio signals on 2G networks are digital, though both systems use digital signaling to connect cellular radio towers to the rest of the mobile network...