Synchronous serial Re: E-Mail Formats RE: Future of cctalk/cctech

Paul Koning paulkoning at
Thu Jun 18 19:32:01 CDT 2020

> On Jun 18, 2020, at 5:47 PM, Antonio Carlini via cctalk <cctalk at> wrote:
> ...
>> Anyway, this whole line of attack is fairly academic as the modems can
>> only do 48kbps - 160kbps and the maximum for the DSH/T32 seems to be
>> 19200bps.
> I'd be surprised if they don't work at up to 56k at least. Maybe not 64k (I remember the DSV11 firmware engineer telling my that some extra work had to be done to get one of the DSV11 modes to work properly at 64k even in pathological cases, so maybe other, lower-end interfaces didn't get the same love).
> Above 64k would not have been a normal use case back in the day - I don't have any data handy to check what should work though.

Not with modems, but of course the "local" line cards (coax pairs) for the DMC/DMR/DMP sync DDCMP controllers could go at 1 Mb/s.  DMC only barely (with a few bugs).  The DMV doesn't have that capability if I remember right.


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