                     USE of &Q6, &Q5, &Q0 ,&Q8 and &Q9

                                 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. Sometime  &Q0 will help when doing slower 'bauds'  and
if you want to have a direct connect  with NO MNP4 or v42 error correction.

     The best place to do this is in the dial prefix, or directly typed  in
terminal  mode.  The INIT string is not a good place, unless you  want  ALL
calls set that way.

     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 slightly. (V42bis will pass-through compressed files so does not have
to  be disabled when transferring compressed files.) The &Q8  command  will
set  the  modem  to  negotiate error MNP.  S46=136  sets  compression  OFF.
AT&Q8S46=136   or  AT&Q8S46=136DT. The use of &Q5S46=138 will restore  full
negotiation. If you want MNP4/5 then leave out the S46= command. ALso using
AT&Q9(DT)  will act as if S46=128 and &Q5. So you could leave  S46=136  and
use &Q9 in place of &Q5.

     The  \N0 should not 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.

                                   Don Hinds - Zoom Tech
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