10 Aug
2016
10 Aug
'16
4:16 p.m.
On Tue, Aug 9, 2016 at 10:31 PM, tony duell <ard at p850ug1.demon.co.uk> wrote:
The problem is that one of the 300 baud Bell tones is
effectively the
same as (I think) the long-distance clearing signal. Something like that
anyway. If you connect your 300 baud US modem over here it will
effectively cause the exchange to hang up.
Wow, I knew the tones were different, but I thought that was just the
typical NIH syndrome, doing it different to be different.
CCITT (later ITU-T) V.21 (300 bps full duplex), V.23 (1200 bps
half-duplex) and V.22 (1200 bps full-duplex) modem protocols were
never popular in the US; Bell 103, 202, and 212, respectively, were
used instead.
So what did people do if they needed to make a data call to the US?
Was that just not done until the US started using CCITT modem
protocols such as V.22bis (2400 bps)?