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&Q6
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1994-03-29
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47 lines
3-1-94
USE of &Q6, &Q5, &Q0, &Q8 and &Q9
Don Hinds
(this applies to Zoom V-series modems, not RPI based 'Axx' modems)
(NOTE: normally this only applies to the Calling modem. A 2400 plain
modem calling into a high-speed will usually connect OK>)
The default setting for Zoom V-series modems is &Q5 which enables
speed buffering, and enables protocol negotiation. When you want protocol
turned OFF, use the &Q6 command which leaves the speed buffering. Either
typed directly AT&Q6, or in the Dial Prefix AT&Q6DT. To turn it back ON,
AT&Q5 or AT&Q5DT will do it. Sometime &Q0 will help when doing slower
speeds like 1200 or 300bps and/or if you want to have a direct
(unbuffered) connect with NO MNP4 or v42 error correction. If you do this
I recommend you use the S37 register to set speed with N0 command to
specify modem speed.
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 MNP (but not V42xx). S46=136 sets
compression OFF. AT&Q8S46=136 or AT&Q8S46=136DT for MNP4 only. 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 to
get just EC and no compression.
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.
Normally the following shouldn't bee needed, as they never get
nogotiated when you use &Q6 or &Q0. %C0 turns off Compression (v42bis) but
leaves error checking (v42). %C1 turns on Compression. S48=128 disables v42
(and thus 42bis, S48=7 restores it.
Don Hinds - Zoom Tech
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