psn

from The Free On-line Dictionary of Computing (8 July 2008)

Packet Switch Node
PSN

   (PSN) A dedicated computer whose purpose is to accept, {route}
   and forward {packets} in a {packet-switched} network.

   (1994-11-30)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

PSN
       Packet Sequence Number (OLSR)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

PSN
       Packet / Public Switched Network

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

PSN
       Packet Switch Node (ARPANET, MILNET)