> This is bogus. A all-zero async map means that no characters are
>escaped, so everything is transmitted as-is. So, so all those
>"special characters" are still being transmitted over the link. Besides
>"special characters" aren't supposed to cause retrains, because the
>connection should be 8-bit clean.
This is NOT bogus if the modems try to interpret a specific sequence of
characters as some kind of command, akin to sending a "+++" if that escape
to command mode hasn't been disabled. The connections can be 8 bit clean
with or without escaping certain characters. We are talking about certain
control characters, not the presence/absence of the high order bit. The
control characters are passed in either case, but in the case of escaping
them, a two byte substitution is made for the offending control character.
The example is the previous example given... The escaping of xon/xoff.
If your modem is not set properly, it will listen to xon/xoff.. With the
characters escaped, the modem does not see the xon/xoff but the
connections on the other end of the ppp connection do. Besides, how do
you explain the several reports of disconnects while in ppp mode vice
none in plain telnet? And this is with the same equipment on both ends
as to modems, computers, term servers, etc.