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Three types of data links were supported:cite-ref-linnell-5-4[5]

• Synchronous Data Link Control (SDLC) high speed wide area networks

• X.25 packet-switched networks

• Token Ring local area networks (LAN)

Application Servicescite-ref-linnell-5-5[5] were provided by:

• CCS supported IBM 3270 data streams, mainly for existing devices

• Document Content Architecture specified a format for documents to be exchanged among different word processors and other software

• Intelligent Printer Data Stream (IPDS) was a page description language like Xerox Interpress or Adobe PostScript

• SNA Distribution Services (SNADS) for store and forward document transmission

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