North American Network Operators Group|
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Re: And we thought the text part of the Starr Report would be bad
> > > 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.