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# Open Systems Interconnect (OSI) model, ISO/IEC 7498-1 standard references:
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* [ISO standard](https://www.iso.org/standard/20269.html)
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* [Microsoft](https://support.microsoft.com/en-us/help/103884/the-osi-model-s-seven-layers-defined-and-functions-explained)
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* [Cisco](https://www.cisco.com/cpress/cc/td/cpress/fund/ith/ith01gb.htm)
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* [Oracle](https://docs.oracle.com/cd/E18283_01/network.112/e10836/layers.htm)
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* [IEEE 1983 paper](http://ieeexplore.ieee.org/document/1457043/)
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![](https://alln-extcloud-storage.cisco.com/ciscoblogs/osi-550x425.gif)
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Original source: [Cisco](https://blogs.cisco.com/cloud/an-osi-model-for-cloud)
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# ADIOS2 architecture proposed amendments to comply with the OSI model standard:
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```
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adios2
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│
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│
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└─── public (rename core, OSI layer 7 application)
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│
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└─── engine (layer 7 -> public, system layers 6,5,4 -> protected, private)
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│
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└─── presentation (OSI layer 6)
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| |
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| │
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| └─── transform (same)
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| | │
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│ │ └─── compression (bzip2, zfp, szip, ...)
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| | └─── vis
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│ │
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│ └─── format
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│ │ │
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│ │ └─── bp1
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│ │ └─── bp2
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│ |
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│ └─── analytics (can be treated as managing collective transforms)
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│ │
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│ └─── visVTKm (from hackathon)
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│ └─── pca
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│ └─── SVD
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│
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│
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└─── session (renaming TransportMan, OSI layer 5)
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│ │
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│ └─── fileSession
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│ |
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│ └─── dataMan
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│ |
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│ └─── dataSpaces
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│ └─── sst
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└─── transport (same, OSI layer 4)
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| │
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│ └─── file (POSIX, stdio, fstream, ...)
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│ └─── wan (libZmq, ... )
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│ └─── shmem (SystemV, mmap, ... )
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│ └─── rdma (ibverbs, nvlink, ... )
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| └─── multitier (ceph)
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└─── interop (same, OSI layers 6,5,4)
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│
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└─── adios1
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└─── hdf5
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``` |