tsap

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

Transport Service Access Point
TSAP

   <networking> (TSAP) Part of the {OSI} {IP Presentation
   Addressing schema}.

   A TSAP identifes the {service access point} between the
   {session layer} and the {transport layer}.

   (1999-08-01)

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

TSAP
       Transport Service Access Point (OSI, OSI/RM, SAP)