Telnet sessions where often initiated from half duplex terminals. Pushing that flow control across the network helped those users.
-- Mark Andrews > On 23 Sep 2023, at 06:25, Michael Thomas <m...@mtcc.com> wrote: > > >> On 9/22/23 9:42 AM, Jay Hennigan wrote: >>> On 9/21/23 17:04, Michael Thomas wrote: >>> >>> When I wrote my first implementation of telnet ages ago, i was both amused >>> and annoyed about the go-ahead option. Obviously patterned after audio >>> meat-space protocols, but I was never convinced it wasn't a solution in >>> search of a problem. I wonder if CDMA was really an outgrowth of those >>> protocols? >> >> Typically seen with half-duplex implementations, like "Over" in two-way >> radio. Still used in TTY/TDD as "GA". >> > DId that ever actually occur over the internet such that telnet would need > it? Half duplex seems to be pretty clearly an L1/L2 problem. IIRC, it was > something of a pain to implement. > > Mike >
