On Thu, Jun 18, 2020 at 2:48 PM Paul Koning via cctalk <[email protected]> wrote: > > On Jun 18, 2020, at 2:14 PM, Peter Coghlan via cctalk > > <[email protected]> wrote: > > As I mentioned in another reply, I have a pair of baseband synchronous > > modems > > and were it not for a speed incompatibility between them and the MicroVAX > > synchronous serial interfaces I have access to, ... > > I'm curious about that. Synchronous modems supply the bit clock to the > interface. So a synchronous interface works at whatever speed the modem > delivers, so long as it's not too fast for the interface. What are the > Microvax sync interfaces you have? DMV? DUV? A DMV will work at up to 56 > kbps.
We used to run our sync serial stuff between 9600 and 56kbps, both our own Bisync products, and DDCMP over interfaces like the one that's part of the DMF32. We had customers in Europe running our products at 64kbps with no problems, and we did have one modem eliminator clocked at 115kbps for testing, which is the max speed for V.24, IIRC. 56kbps should be safe for the devices you are describing, but it might go a little faster. -ethan
