dupuy%amsterdam@COLUMBIA.EDU (Alexander Dupuy) (09/17/86)
I learned some time ago that Western Electrics ESS's are actually just 3b20D (duplex cpu) machines, or vice versa, that 3b20s are just ESS's running Unix. It occurred to me to wonder what OS the ESS run. Surely not System V? Do they even run an OS at all, or are they just running a single application program that does all the switching, call logging, etc.? Perhaps someone out there could enlighten me. @alex
heiby@cuae2.att.com (Ron Heiby) (09/26/86)
The AT&T 3B20D computer is at the heart of some ESS made by AT&T. There is a lot more hardware to an ESS than just the computer, though. The 3B20D does run a release of the UNIX system, called UNIX/RTR (for Real-Time Reliable) which is planned (I think) to be upgraded to SVID compatability some time. The 3B20D and UNIX/RTR are not generally available except to RBOCs (Regional Bell Operating Companies, the "baby bells"). That's about all I know, as I'm not in the switching area. -- Ron Heiby heiby@cuae2.ATT.COM Moderator: mod.newprod & mod.os.unix AT&T-IS, /app/eng, Lisle, IL (312) 810-6109 "Hay una mujer desaparecida...."