1 Feb
2025
1 Feb
'25
6:20 p.m.
On Jan 31, 2025, at 6:19 PM, Cameron Kaiser via cctalk
<cctalk(a)classiccmp.org> wrote:
That's not the case for the 202 modem I have; it is definitely 202 only and does not
offer 103 compatibility.
paul
Low speed modems are just analog devices that can
pass any signal up to
whatever the design speed limit is. For example, a 103 modem is good up
to 300 bps, but will happily carry anything less. A 202 modem (see
below) is designed for 1200 but also will work at lower speeds, and has
been used at 1260 bps.
I'd argue those are differing situations, though. Bell 103 and Bell 101 modems
use the same AFSK frequencies, just at different speeds. Bell 202 modems have
specific hardware to support Bell 103, effectively two modems in the same case.