110 Baud modem

Paul Koning paulkoning at comcast.net
Tue May 9 15:19:44 CDT 2017

> On May 9, 2017, at 2:58 PM, Brent Hilpert via cctalk <cctalk at classiccmp.org> wrote:
> On 2017-May-09, at 9:06 AM, Chuck Guzis via cctalk wrote:
>> Looking at this documents:
>> http://www.samhallas.co.uk/repository/telegraph/data_set_101c.pdf
>> I sill can't figure out what a lot of the stuff inside is for.
> I've looked at one of these modems in the bottom of a 33 although not examined it in great depth.
> I expect a large part of the volume of stuff like the relays isn't really modem but call-management sequencing & switching: on/off hook, incoming-call detect, answer detect, originate/answer mode switching, etc.

Yes, that's what the manual suggests, it lists a half dozen relays.  It's not clear why any of them would be more than one or two pole relays, but perhaps the ones that were actually used (which are many-pole devices) happened to be standard units and were "more than enough for the job".


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