Hayes modem auto-bauding

[Gary S. Trujillo]

In <1990Oct12.034821.7146 at fithp.uucp> mhw at fithp.uucp (Marc Weinstein) writes:

[ concerning my article about replacing uugetty ]

> Does this imply that the default uugetty which comes with HoneyDanber
> cannot do autobaud'ing?

Right.  Your modem may be able to recognize different speeds based on the
type of carrier tones presented, but neither getty or the stock HDB uugetty
know how to switch the baud rate of the serial port.

> If this is the case, then what difference does it
> make what baud rate is specified to the uugetty?

Specified to the uugetty?  Well, it shouldn't matter what speed the serial
port is initially set to, as long as it can talk to the modem, if that's
what you mean.  After recognizing a connection at a given speed, the new
uugetty should be able to change the interface speed to match that speed.

> Why would such a thing
> even be specified?  It sounds like the far end is going to a) connect
> to the modem (i.e. the modems will be speaking at the same rate), b) send
> enough BREAKs to toggle to the speed which provides a recognizable "login:"
> string, and then the two systems are talking.  So, it really made no
> difference WHAT baud rate the uugetty was initially set to.

I think you missed the point.  With the new uugetty, you shouldn't need to
send any BREAKs - ever!  The whole idea is to have the uugetty take care of
matching the interface speed to the connection speed so you don't have to
send BREAKs.

-- 
    Gary S. Trujillo                            gst at gnosys.svle.ma.us
Somerville, Massachusetts              {wjh12,bu.edu,spdcc,ima,cdp}!gnosys!gst