Connectivity Framework
1 : Introduction
The connectivity reference architecture proposes an IIoT connectivity stack model using the OSI and the Internet models as reference . It defines the core functions and key considerations at each layer in the IIoT connectivity stack . It defines an assessment template worksheet to understand and assess any connectivity technology objectively , and then determine the core connectivity standard closest to the technology under assessment .
Assessment templates for dealing with major IIoT system design challenges introduce core connectivity standards . These include the Data Distribution Service ( DDS ) for systems facing a software integration challenge , OPC-Unified Architecture ( OPC-UA ) for systems facing device interchangeability issues , HTTP / REST 1 for web and mobile user interfaces , and oneM2M for information and communications technology integration with wide area wireless telecommunication provider network services . The architecture integrates other connectivity technologies by interfacing to a core connectivity standard . This satisfies the range of application challenges with minimum complexity . We also provide assessment templates for common domain-specific connectivity technologies typically used at the network edge .
1.4 STRUCTURE
Chapter 2 defines the IIoT connectivity stack model and introduces the Connectivity Framework ( framework ) and the Connectivity Transport ( transport ) layers . It clarifies the role of connectivity in enabling syntactic interoperability , i . e . exchanging structured data , in system architecture , and introduces the key system characteristics directly affected by connectivity .
Chapter 3 defines the requirements for core connectivity standards and proposes connectivity gateways to bridge a domain-specific connectivity technology to a core connectivity standard and open up hitherto inaccessible endpoints . This approach is tenable with a few core connectivity standards with core gateways for interoperability amongst them , and many domain-specific technologies that can use a gateway to any of those core standards .
Chapter 4 dives into the connectivity framework layer . It defines the core functions and the typical considerations and trade-offs to apply when considering a connectivity framework technology .
Chapter 5 dives into the connectivity transport layer . It defines the core functions and the typical considerations and trade-offs to apply when considering a connectivity transport technology .
Chapter 6 defines a template for assessing any connectivity technology from a business , usage , functional , and implementation viewpoint . It introduces a worksheet that can be used as a tool to understand , categorize and evaluate any connectivity technology .
Chapter 7 uses the assessment template worksheets to describe the prominent connectivity standards for IIoT . It also describes some of the connectivity standards prominent in specific verticals .
1
REST stands for Representational State Transfer and is an architectural style for networked applications [ WKPD-REST ]. It is almost always implemented with the HTTP or CoAP protocols .
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