Connectivity Framework 2: Connectivity Framework
2 CONNECTIVITY FRAMEWORK 2.1 IIOT CONNECTIVITY STACK MODEL
The seven-layer Open Systems Interconnect( OSI) Model( Wikipedia) 1 and the four-layer Internet Model( Wikipedia) 2 do not capture all industrial internet connectivity requirements. IIoT systems require a new connectivity functional layer model to address distributed industrial sensors, controllers, devices, gateways and other aspects. This section proposes an IIoT connectivity stack model using the OSI model and the Internet model as reference.
Figure 2-1 shows the IIoT connectivity stack model, and the scope of the connectivity as a crosscutting function within the Industrial Internet Reference Architecture( IIRA) 3. The connectivity function provides the data-sharing mechanisms amongst participants within a functional domain and across functional domains within an IIoT system.
|
Participant X |
|
Participant Y |
Information |
Distributed Data Interoperability and Management |
Information( Data in Context) |
Distributed Data Interoperability and Management |
|
Framework |
Data( State, Events, Streams) |
Framework |
Connectivity |
|
|
|
|
Transport |
Messages |
Transport |
Networking |
Network |
Packets |
Network |
|
Link |
Frames |
Link |
|
Physical |
Bits |
Physical |
Figure 2-1: Industrial Internet Connectivity Stack Model. Each layer builds on the capabilities provided by the layer below. The‘ Connectivity Framework’ layer provides data sharing mechanisms among participants. The‘ Distributed Data Interoperability and Management’ layer relies on the mechanisms provided by the‘ Connectivity Framework’ layer to provide meaningful information sharing.
1
See [ ISO-7498-1 ], for overview [ WKPD-OSI ]
2
See [ IETF-RFC1122 ], for overview [ WKPD-IPS ]
3
See [ IIC-IIRA2015 ] IIC: PUB: G5: V1.0: PB: 20170228- 14-