                     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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