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.
