High Quality Content by WIKIPEDIA articles! Xerox Network Services (XNS) is a protocol suite developed by Xerox within the Xerox Network Systems Architecture. It provided general purpose network communications, internetwork routing and packet delivery, including higher level functions such as a reliable stream, and remote procedure calls. XNS predated and influenced the development of the Open Systems Interconnect (OSI) networking model. XNS was developed at Xerox PARC in the early 1980s, based heavily on the earlier (and extremely influential) PARC Universal Packet (PUP) protocol suite done there in the late 1970s; some of the protocols in the XNS suite were lightly modified versions of the ones in the PUP suite. XNS was intended to be a commercial descendant of the research/development oriented PUP.

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