🚀 go-pugleaf

I know of two reliable and widely used 56kb CSU/DSUs.

The Dowty Information Systems unit has been sucessfully used by many
people for years.  Several of the regional networks use them.  The
unit that has both an RS232 and a V.35 interface is popular and I
believe is only about $695.  They have a less expensive model with a
V.35 only interface. Dowty can be reached at (800) 553-6989.  The
person to talk to is Carol Kaufman.  They are in Cherry Hill N.J. , so
you need to call during East Coast business hours.

In the last year Teleprocessing Products came out with a 56kb CSU/DSU
that looks pretty good.  Someone that I talked to working in one of
the large PDN's recently did an evaluation to compare this unit with
the Dowty and ranked them equivalent in reliability and performance.
They chose the Teleprocessing Products model, since it lists for only
$500.

One nice thing about the Dowtys, is that all the dip switches and
loopback buttons are inside a little door that flips open on the front
panel.  Easier to get at then rear mounted dip switches, and the test
buttons are protected from accidentally being hit.

Rob