channel service unit/data service unit

from The Free On-line Dictionary of Computing (8 July 2008)
channel service unit/data service unit

   <communications, hardware> (CSU/DSU, or "..digital..") A
   device that performs both the {channel service unit} (CSU) and
   {data service unit} (DSU) functions.  The Channel Service Unit
   (CSU) is used to terminate a {DS1} or {DS0} (56/64 kb/s)
   digital circuit.  It peforms {line conditioning}, protection,
   {loop-back} and timing functions.  The Data Service Unit (DSU)
   terminates the data circuit to the {Data Terminal Equipment}
   (DTE) and converts the customer's data stream into a bi-polar
   format for transmission.

   (2001-10-19)
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