Sorry this response is so late.  I've been bogged down with school work
lately.  I'm still trying to respond.

>I might have misunderstood you before. I thought you were trying to
>set ppp parameters from an stty command.

Sorry I was confusing.

>While ppp is running, try "stty -e -f /dev/tty00" and see what the
>settings are while ppp is up.
>
>The serial drivers will certainly respect CTS going low if crtscts is
>asserted. They will immediately stop sending (any character in
>transmission will of course be finished).
>
>One other question. Are you using the modem initialization string you
>use inder MacOS? The modem string in the non-demand-dial kit is just
>the one MacSlIP was using on my modem. Your modem might need different.

I'm using the same initialization string for MacPPP and ppp-up on BSD.
It's at&f1&c1&d2&k3

&f1:  Set factory settings 1, just basic stuff is set.
&c1:  Set's carrier detect low when disconnected, up when connected
&d2:  When dtr drops, the connection drops.  I've tried &d0, but that
doesn't affect when I send through ftp and pppd still continues to send
after FC has gone low.
&k3:  Use hardware flow control

Here's what happens when I do "stty -e -f /dev/tty00" when pppd is not
connected:
speed 9600 baud; 0 rows; 0 columns;
lflags: icanon isig iexten echo echoe -echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho -pendin -nokerninfo
        -extproc
iflags: -istrip icrnl -inlcr -igncr ixon -ixoff ixany imaxbel -ignbrk
        brkint -inpck -ignpar -parmrk
oflags: opost onlcr oxtabs
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -mdmbuf
discard dsusp   eof     eol     eol2    erase   intr    kill    lnext
^O      ^Y      ^D      <undef> <undef> ^?      ^C      ^U      ^V
min     quit    reprint start   status  stop    susp    time    werase
1       ^\      ^R      ^Q      <undef> ^S      ^Z      0       ^W

Here's the same thing when pppd is connected:
ppp disc; speed 38400 baud; 0 rows; 0 columns;
lflags: -icanon -isig -iexten -echo -echoe -echok -echoke -echonl
        -echoctl -echoprt -altwerase -noflsh -tostop -flusho -pendin
        -nokerninfo -extproc
iflags: -istrip -icrnl -inlcr -igncr -ixon -ixoff -ixany -imaxbel ignbrk
        -brkint -inpck ignpar -parmrk
oflags: -opost -onlcr -oxtabs
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb crtscts -mdmbuf
discard dsusp   eof     eol     eol2    erase   intr    kill    lnext
^O      ^Y      ^D      <undef> <undef> ^?      ^C      ^U      ^V
min     quit    reprint start   status  stop    susp    time    werase
1       ^\      ^R      ^Q      <undef> ^S      ^Z      0       ^W


Can you make anything of this?

Thanks a lot for the help,

Jon
jlefman@bu.edu