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by nneonneo
1433 days ago
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Fair! Thanks for the correction. I intended to say bits per second. Luckily I think I’m still in the right ballpark for speeds (at least in the early 80s). Did any of those old modems use QAM? It seems like many of the older protocols were FSK/PSK-based (yes, special cases of QAM, but not decoded the same way). |
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Referring to wikipedia [0] I note v22.bis was released in 1984, and while they're a bit vague, they suggest 2 or 3 bits per signalling change in those 1200bps modems.
I also recall, though perhaps later, vendors were often champing at the bit with 'proposed spec' compliant hardware available prior to the formal specifications dropping, so it was not uncommon to have some of those new speed devices prior earlier (obviously with some risk attached). I think that was more around the 14400bps era though.
Anyway, my extremely solid Telecom 2400bps modem was almost definitely running at 600baud (produced in the late 1980's, though in my possession from very early 1990's).
Depressingly, a lot of ostensibly tech articles (eg [1]) conflate baud with bps, making them poor-use / low-trust historical references.
[0] https://en.wikipedia.org/wiki/Modem#1980s
[1] https://www.techradar.com/au/news/internet/getting-connected...