Hello,
Does anyone have an old 56Kdds dsu/csu that is make entirely of discrete logic and components? I'm trying to find one, to figure out how the signaling is set up...
ideas or old (working) gear for sale?
James
I've got some old 56k DSU/CSUs out in my garage, I can't remember the brand name offhand, but it might be datatell. Some of the stuff we bought was rebranded with the mainframe maker's stick-on logo. I'm not sure what you mean by 56kdds, we called them ADN circuits. IIRC, when I looked at the circuit boards of these, they didn't have any smarts, i.e. a microcontroller on the board. However, they may use a technology known as a state machine, which is difficult to understand and trace down without detailed schematics.
My email addr is below.
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