V.28

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

V.28

   <communications, standard> An {ITU-T} physical interface
   {standard} for {serial} data communications equipment,
   formally titled "Electrical Characteristics for Unbalanced
   Double-Current Interchange Circuits".  The combination of V.28
   and {V.24} is equivalent to the {EIA}'s {RS-232} and uses the
   same 25-pin connectors.

   (2001-04-06)