IBM Systems Application Architecture - Common Communications Services (CCS)

Common Communications Services (CCS)

Common Communications Services defined the methods by which hetrogeneous systems communicated. CCS depended on Advanced Program-to-Program Communications, also known as APPC or LU6.2, Systems Network Architecture (SNA) PU2.1 or Low Entry Networking for peer to peer networking, and SNA Management Services for network control.

Three types of data links were supported:

  • Synchronous Data Link Control (SDLC) high speed wide area networks.
  • X.25 packet-switched networks.
  • Token ring local area networks (LAN).

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. Application services were provided by SNA Distribution Services (SNADS) for store and forward document transmission, Document Interchange Architecture (DIA) for electronic mail, and Distributed Data Management for file sharing.

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