-=> Quoting Wes Newell to Rodrigo Cesar Banhara <=-

 LE> A CSU/DSU isn't a modem. It's *digital* 
 LE> interface, not an analog one.
 LE> These are old and fairly obsolete. They're intended for leased lines
 LE> or possibly the old "switched 56k" service.
 
 RCB> Neat. Others options?

 WN> Missed the original, but CSU/DSU's are far from obsolete. CSU is a
 WN> Channel Service Unit & DSU is a Data Service Unit. They can be just a
 WN> CSU, just a DSU, or a combo, which are usually refered to as add/drop
 WN> units. Most are used with a T1 line (24 64K channels). The CSU is
 WN> general used in voice applications while the DSU is used for data. The
 WN> csu/dsu (add/drops) is used when the 24 channels are split between
 WN> voice and data. 

The ones I've got are obsolete, not CSU/DSUs in general.

As I noted, mine only run up to 56k on a 4 wire leased line.

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