DNP3 Protocol 3.3

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The Distributed Network Protocol version 3.3 or the DNP 3.3 is a protocol used in the telecommunication between the master station, RTU’s (Remote Telemetry Units) and other Intelligent electronic devices. The DNP 3.0 was introduced to communicate between systems in the electric utility, waste and water, oil and gas and security industries(Clarke, Reynders, & Wright, 2004).
Created by Harris controls division for the use in electrical utility industry, the DNP 3.0 was available for the third parties in 1993. The DNP3 was specifically designed for the Supervisory Control and Data Acquisition (SCADA) applications. It involves sending and receiving control commands between different computers in the system. Unlike FTP which involves sending large
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It has been identified as the most suitable mode of data communication for SCADA systems. Being an electrical engineer and especially from the Power Systems background, I feel, choosing this topic would be ideal and I hope after completing this term paper I would be able to understand the concepts of DNP3 protocol thoroughly and I believe that I could share this concept with my fellow classmates during the presentation.
1.2 INTEROPERABILITY AND OPEN PROTOCOL
The major feature of DNP3 protocol is its interoperability. The DNP3 is an open protocol which is supported by large number of equipment manufacturers. The open standard provides interoperability between different devices from different manufacturers. To build a system the DNP3 compatible devices could be sourced from different manufacturers, either during the initial installation or at it could be developed progressively in time. DNP3 is known for its strong compliance system. This allows the manufacturers to install systems with reduced functionality that could still provide defined levels of functionality(Clarke et al., 2004).

1.3 SYSTEM TOPOLOGY
The DNP3 could operate in different topologies the are Master Slave, Multidrop from one master, Hierarchical with intermediate concentrators and Multiple master. The below figure represents the different network
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The application layer provides an application header to the data. This forms an application protocol data unit or APDU. This in turn is used by the next layer by giving its own header and it passes to the next level and so on. At the transport level, Session Protocol Data Unit or SPDU is broken into multiple data units. At the data link layer, a header and a trailer section containing an error detection code is added to form the Link Protocol Data Unit (LPDU)(Clarke et al., 2004).
The OSI model is not a protocol instead, it provides a frame work for the development of other communication protocols. The bottom four layers could be classified as transport layers and top three could be classified as the high-level layers. There was a need for much simplified versions of the OSI model in the field of SCADA and IED communications. Hence a 3-layer model was created by the International Electrotechnical Commission which is called as the Enhanced Performance Architecture model or the EPA model(Clarke et al., 2004).

2.2 THE EPA

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