V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SMDS
       Switched Multimegabit Data Service (BELLCORE, BIT)


The Free On-line Dictionary of Computing (30 December 2018):

Switched Multimegabit Data Service
SMDS

    (SMDS) An emerging high-speed datagram-based
   public data network service developed by Bellcore and
   expected to be widely used by telephone companies as the basis
   for their data networks.

   See also Metropolitan Area Network.

   (1997-01-31)