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?

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


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