[sci.electronics] Help with communications stuff

dad@cs.brown.edu (David A. Durfee) (06/17/91)

Its been a while since I've been in the communications business.
I want to get back into it but I need to learn some new stuff.
Where can I get information on X.25 and ISDN?

(I'm posting here since I don't know what group would be more appropriate
and I've subscribed to this one for a long while.)