110 Baud modem

[Pete Lancashire]

The relays were from WECO. Made by the millions, they were the ones  used
in all Bell telephone exchanged from the early 50's up to the ESS
(electronic) exchanges. Remember seeing ones with less then a full
compliment of contacts, but that was pretty uncommon.

https://archive.org/details/bstj31-6-1023




On Tue, May 9, 2017 at 1:19 PM, Paul Koning via cctalk <
cctalk at classiccmp.org> wrote:

>
> > 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".
>
>         paul
>
>
>
>