Connectivity Framework
3 : Connectivity Reference Architecture
Endpoints
Domain-Specific Connectivity Technology
Gateway to a Connectivity Core Standard
Connectivity Core Standards
Core Gateways
Figure 3-3 : A standardized gateway between core connectivity standards can allow domain-specific endpoints connected to one core standard to communicate with domain-specific endpoints integrated over another core standard .
To realize the goals of communication across functional domain and horizontal interoperability across industries , a standardized Core Gateway shall be defined between each of the core connectivity standards , as shown in Figure 3-4 .
Endpoints
Domain-Specific Connectivity Technology
Gateway to a Connectivity Core Standard
Connectivity Core Standards
Core Gateways
Figure 3-4 : Each core connectivity standard requires a standardized gateway to all other core standards . Each additional core standard creates increasing complexity and interoperability challenges . By restricting the design to a few core connectivity standards , we cover the needs of IIoT systems across the functional domains , and attain the goal of horizontal interoperability across industries .
Let K be the number of core standards . Then the number of core gateways that will be standardized is K * ( K - 1 ) / 2 , as shown in Figure 3-4 . If N is the total number of connectivity technologies ( see Figure 3-1 ), then only additional ( N-K ) gateways are needed with the introduction of core standards . The total number of gateways required becomes K *( K-1 )/ 2 + ( N-
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