3174 Terminal Controller

[James Fogg]

> But the thing that brings this to the foreground in my 
> thoughts is that today I had to troubleshoot a 3174-51R at a 
> customer's site. This thing is connected, via a rather 
> unusual cable, to a Cisco 2500 series router, so that means 
> the 25 pin connector on the back must be some form of X.25 or 
> something like that. I know that the fellow at corestore.org 
> has been able to get a real IBM terminal to telnet into an 
> emulated system via a terminal controller with built in 
> ethernet (although I have never seen one).

This is usually SDLC that is source-route-bridged over IP. S390 Open
System Adapters (or whatever they called the ethernet/ip adapters for
old S390's) could talk SRB/IP. It's been 13 years since I played with
these.

So, on the "cluster controller" (3174) end you have stock SDLC via
synchronous serial on either RS232 or V.35. On the server end you'll
need to get hercules to emulate an OSA.