KBps

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

kilobits per second
kbps

   <unit> (kbps, kb/s) A unit of {data rate} where 1 kb/s = 1000
   bits per second.  This contrasts with units of storage where 1
   Kb = 1024 bits (note upper case K).

   (2002-03-23)