[19755] in North American Network Operators' Group
Re: And we thought the text part of the Starr Report would be
daemon@ATHENA.MIT.EDU (Roger Fajman)
Thu Sep 24 11:26:37 1998
To: nanog@merit.edu
From: "Roger Fajman" <RAF@CU.NIH.GOV>
Date: Thu, 24 Sep 1998 00:45:39 -0400 (EDT)
> > > For modem to modem communications, start and stop bits were used
> > > up through 2400 baud when one bit = one tone. The method of one
> > > bit = one tone was dropped for other forms of encoding when modems
> > > started supporting connection speeds in excess of 2400 baud.
> >
> > I assume you mean 2400 bps modems, i.e., v.22bis? Admittedly, it's been a
> > while since I used one, but my recollection is that 2400 bps modems operate
> > at 600 baud, with 4 bits/baud using QAM.
>
> This matches my recollection. I think it was 1200 bps that was the
> last 1 bit per baud modem.
>
> Cheers,
> -- jra
Yes and no. The Bell 202 was 1200 bps, one bit per baud, half duplex
on a switched line. The Bell 212 was 1200 bps, 600 baud, 2 bits per
baud, full duplex. So was the Vadic 3400, which preceded the 212.
