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Title: Using Cellular Digitized Packet Data Cdpd() In A Scada System
Author: Dean Gordonwood
Source: 1996 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1996
Abstract: In 1992, nine cellular service providers came together to form a consortium, the purpose of which was to develop a specification of a standard for the transmission of digital data packets over the cellular network. The companies forming this consortium are: Ameritech Mobile Communications, Inc. Bell Atlantic Mobile Systems Inc. GTE, Mobilnet Inc. Contel Cellular, Inc. McCaw Cellular Communications, Inc. NYNEX Mobile Communications, PacTel Cellular, Southwestern Bell Mobile Systems. These companies came together to address the need their customers had to send small messages over the cellular system at a reasonable cost. In July 1993, the first release of the specification for Cellular Digital Packet Data (CDFD) was issued. By the end of the third quarter of 1995, CDPD had been deployed in 49 Metropolitan Service Areas around the United States. As the deployment of CDFD continues, using it as a means of communication in a real-time SCADA. system is becoming a viable alternative to current methods of data communication. This paper will describe what CDFD is, how a CDPD system works in general, the components of a CDFD network, its use in an installed SCADA application and the advantages and disadvantages of CDPD as opposed to other technologies.

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