Does anybody know anything about PMX/Term from AT&T?

[Rich Bantel]

The question was asked, "Can old STARLAN SW coexist with new (ISO) SW?"
A followup response stated NO.

The answer is indeed YES. The proprietary set of protocols can run
on the same media as the new protocols. So, if you want to keep an old
server (and some clients) running the old stuff, you can do so while
also having ISO traffic on the same network. Isolation is provided
by the LLC protocol.