Help! Molasses in the Comm lines

Fellow MidRange-L - ers:
Just switched our comm lines from four 9.6k analog lines running on the
S/36 side of a 436, to three 56k digital on the AS/400 side.  All remote
controllers and workstations are active, but instead of being 4 or 5
times faster, they're 2 or 3 times SLOWER.  Have I missed something
important on line or controller configuration, or should I keep
screaming at the phone company?  Any advice from those who have been
there is welcome.
 -- Willy
 
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  Willy Wilson                  
willy@riback.com           
Columbia, MO USA
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