What does PU2.1 stand for?

MLA style: "PU2.1." Acronym Finder . 2012. AcronymFinder.com 1 Jun. 2012 <a href="http://www.acronymfinder.com/Physical-Unit-2.1-(peer_to_peer-as-in-APPN-in-SNA-network)-(PU2.1).html">http://www.acronymfinder.com/Physical-Unit-2.1-(peer_to_peer-as-in-APPN-in-SNA-network)-(PU2.1).html
Chicago style: Acronym Finder . S.v. "PU2.1." Retrieved June 1 2012 from <a href="http://www.acronymfinder.com/Physical-Unit-2.1-(peer_to_peer-as-in-APPN-in-SNA-network)-(PU2.1).html">http://www.acronymfinder.com/Physical-Unit-2.1-(peer_to_peer-as-in-APPN-in-SNA-network)-(PU2.1).html
APA style: PU2.1. (n.d.) Acronym Finder. (2012). Retrieved June 1 2012 from <a href="http://www.acronymfinder.com/Physical-Unit-2.1-(peer_to_peer-as-in-APPN-in-SNA-network)-(PU2.1).html">http://www.acronymfinder.com/Physical-Unit-2.1-(peer_to_peer-as-in-APPN-in-SNA-network)-(PU2.1).html

Physical Unit 2.1 (peer-to-peer as in APPN in SNA network)

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