external machine interface

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

External Machine Interface
EMI

   <protocol> (EMI) A {protocol} primarily used to connect to
   {short message service} centres for {mobile telephones}.  EMI
   is an extension to Universal Computer Protocol (UCP).  EMI was
   was developed by CMG, now a part of {LogicaCMG}, the current
   {SMSC} market leader.

   Each byte of the message is encoded as two {hexadecimal}
   characters using an encoding not quite like {ASCII}.

   EMI specification
   (http://www.netfunitalia.it/downloads/SMSC_EMI_Specification.PDF)

   (2007-09-10)