🚀 go-pugleaf

In article <1991Apr18.152749.8762@cbnewsk.att.com> dennis@cbnewsk.att.com (dennis.seipel) writes:
>I am developing a DCE and want to know an acceptable number of character
>that a DCE may transmit after the DTE sends XOFF flow control.  

0.9  (finish the character you already started sending.)

>Is there
>a standard for this or can anyone refer me to a study of what terminal
>manufactures typically design for?

Prime has been violating this principal of least astonishment for
years, it mainly cause problems on serial printers.  (HP printers were
one of the worst to use with a Prime.) Prime does allow the system
andministrator to adjust the maximum number of characters sent after
an xoff is received, for one you limit the line to 10 CPS (sent at
19200 BPS of course).

In other words, most equiptment will let you send some characters
after it sends the xoff.  The communications latency and processing
time reduce the number that can in practice be sent by the sending
side.  For reliable communications, you should try not to send any
additional characters after getting an xoff.  16 characers will, in
practice, be accepted by the majority of terminals and printers.
Check the manuals of the equiptment in question if you care, but don't
expect to find this info, it's rarly there.

>	Dennis Seipel
>	dennis@inuxy.att.com

Ah, the same company that designed an ISDN async switch that wouldn't
work with several brands of computers and terminals and had a poorly
thought out user interface.  Maybe someday if you fix these problems
we can use our 5ESS for terminal connections.  (I know that AT&T is a
huge company, and you probably have nothing to do with this.)

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blarson@usc.edu
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Bob Larson (blars)	blarson@usc.edu			usc!blarson
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