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&Q6
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1992-12-01
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USE of &Q6 ,&Q9 and &Q5
Don Hinds
When you want protocol turned OFF, use the &Q6 command.
Either typed directly AT&Q6, or in the Dial Prefix AT&Q6DT. To
turn it ON, AT&Q5 or AT&Q5DT will do it. Never use &Q0, as that
is not of any practical use, and leads people to beleive you can
have direct connect AND get some MNP4 or v42 error correction.
>>> If you already have a string (let us suppose it is
AT&F&C1&D2) then you add or insert &Q6 ie; AT&F&C1&D2&Q6. <<<
If you know the connection will be MNP and not v42bis, then
you may want to turn OFF compression (MNP5) if you are
transferring files. MNP5 tries to compress ALL files, slowing
down the transfer of pre-compressed files. V42bis will pass-
through compressed files so does not have to be disabled when
transferring compressed files. The &Q9 command will set the modem
to negotiate error correction only. AT&Q9 or AT&Q9DT. the same
use of &Q5 will restore full negotiation.
The \N0 is not to be used, because it also sets register 48
to 128. The \N3 does not restore S48 to 7, so an additional
command to to that would be needed to restore S48 to default.
Likewise, there is no need for %C0 because the &Q9 does the same
thing, and is consistant with &Q6 and &Q5.
Don Hinds - Zoom Tech
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