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 -