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Title: Using Cellular Digitized Packet Data Cdpd() In A Scada System
Author: Dean Gordonwood
Source: 1998 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1998
Abstract: INTRODUCTION In 1992, eight 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: Amerltech 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 (CDPD) was issued. By the end of the third quarter of 1996, CDPD had been deployed in to more than 60% of the Metropolitan Service Areas around the United States and covers almost half of the U. S. population. As the deployment of CDPD 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 CDPD is, how a CDPD system works in general, the components of a CDPD network, its use in an installed SCADA application and the advantages and disadvantages of CDPD as opposed to other technologies.

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