> Do you consider ISDN separate from telephony or part of it?
It’s kinda of weird. I consider it telephony for sure (half of the TE’s I have are phones and a lot of equipment is T1/E1 equipment for PRI lines) but I also consider it under early computer data networks as it could carry X.25, Frame Relay and other types of traffic. It predates my time using computers a bit, but I believe it was also used for internet connections as uncommon as it was here.
Probably a measurable portion of dial up Internet when compuserve started selling access to their dial plant to ISPs. I worked at a place in the 90s that used compuserve x.25 to get ppp access to our network. It was completely unprotected, all you needed to know was the six character node name and you were in.
Never got too far into X 25, I spent a couple nights after work cruising the network and finding all sorts of stuff that looked like it was on the same level of security.
Problem same. It is not the technology it is the restriction. You use a common pool of radio which is shared. Regulation and rules of engagement abounded.
Still it is better than just radio station as ham is 2 way (and n way based on 2 way). It is a bit decentralised. But read last paragraph. Totalitarian state would not like it.)
It’s kinda of weird. I consider it telephony for sure (half of the TE’s I have are phones and a lot of equipment is T1/E1 equipment for PRI lines) but I also consider it under early computer data networks as it could carry X.25, Frame Relay and other types of traffic. It predates my time using computers a bit, but I believe it was also used for internet connections as uncommon as it was here.