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Using hardware signals (Clear To Send/Request to Send - CTS/RTS)
Using software signals (control S and control Q, also known as
XON/XOFF).
Whilst the latter may be fine for a terminal (text) link, data on a
PPP link uses all 8 bits - and it is quite probable that somewhere in
the data there will be data bytes that translate as control S and
control Q. So, if a modem is set up to use software flow control,
things can rapidly go berserk!
For high speed links using PPP (which uses 8 bits of data) hardware
flow control is vital and it is for this reason that you must use
hardware flow control.
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Bruce Smith bruce@armintl.com
System Administrator / Network Administrator
Armstrong International, Inc.
Three Rivers, Michigan 49093 USA
http://www.armstrong-intl.com/
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