E4

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

E4

   <communications> A European {framing specification} for the
   transmission of 64 multiplexed {E1} data streams, resulting in
   a transmission rate of 139.264 Mb/s (= 139,264 kb/s).

   (2002-03-22)

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

E4
       European digital transmission format 4 [139.264 Mbps]