Mark Woolworth wrote in a message to David Wang:

 DW> I just read a PC Computing Magazine and there is a AD about new 
 DW> release USR I-modem. I don't understand what difference is between 
 DW> it and Z-modem (Sportster 14.4 or 28.8) Can anyone give an idea. 

 MW> It uses ISDN (digital lines) *AND* of voice (analog) lines. On the
 MW> voice line side of things it is exactly like a Courier
 MW> V.everything, but when used with the ISDN lines, its a 100% digital
 MW> connection.

Err... uh... Mark, the I-Modem _must_ operate over exclusively digital
(ISDN) lines.  Over those  lines, it can answer/originate
analog/digital adaptively.  The analog side does mirror the feature set of
the V.Everything, but lacks its SREJ and 244 byte v.42 packet size.

                                   - Bob
Compuserve: 72662,3547
Internet  : bob{at}juge.com

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