channel service unit/data service unit

(CSU/DSU) 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.

(1995-02-28)