Xenix and variable rate incoming calls?

[Jonathan Bayer]

akcs.larry at nstar.UUCP (Larry Snyder) writes:

>Unless the host is using a high speed modem.  On my modems (2 Hayes V-Series
>V.42, USR HST 14.4 kb carrier & Telebit T2000) I lock the ports at 19,200
>baud and don't use a rotating gettdefs - but let the modem do the
>"downshifting". 


The only problem with this is if you try to do downloading from the
Unix box to the other end using Z-modem.  Z-modem is a streaming
protocol, and it dumps data as fast as it can, assuming that it was all
received correctly until it receives some sort of NAK.  Unless the
hardware flow control is working perfectly, you will overflow the
modem's buffer and lose data.  I had this experience, and finally
changed the system to use a rotating gettydefs, but I have a special
program running that autobauds, so all the caller has to do is to press
return a few times and the system will find the right baud rate.


JB
-- 
Jonathan Bayer		Intelligent Software Products, Inc.
(201) 245-5922		500 Oakwood Ave.
jbayer at ispi.COM		Roselle Park, NJ   07204