NNI

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

Network Node Interface
NNI

   <networking> (NNI) The {ATM Forum}'s specification for
   connections between network nodes.  NNI makes network
   {routing} possible.  It typically refers to {backbone} trunk
   connections between ATM switching equipment.

   See also: {UNI}.

   (2001-03-26)

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

NNI
       Network to Network Interface

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

NNI
       Network Node Interface (ATM)