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FORCED
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1994-02-01
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1-31-94 Forced Connect
- - - - - - - - - - - - - - - - - - - - - - - -
Normal INIT for modems on a PC AT&F&C1&D2 Sometimes, even though the
modem seems to get a good connect (usually with hi-speed modem) it does not
actually make the connection correctly. (It may be the OTHER end making the
error). Often if you use one of the (prefix) strings to force that connect
speed the connection will be made 'solid' on both ends. Use your normal
Init string (commonly AT&F&C1&D2 for a PC). Or you may use the section of
the below strings (between the AT...DT) added onto your Init string. Such
as.. AT&F&C1&D2&Q6N1
The normal dial Prefix is ATDT. If the number is 423-1563 then it sends
ATDT4231563 to the modem, which then dials, and connects. This is using
auto-speed (baud) negotiation as well as negotiating Protocol (V.42bis,
MNP etc.). Some modems/software without V42bis/MNP you will call do NOT
like this. Use a prefix w/&Q6 in it.
AT&Q5N1DT :negotiates SPEED and Protocol (default)
AT&Q6N1DT :negotiates SPEED only AT&Q5S37=11N0DT :*Connect 14400, negotiate Protocol 2
AT&Q6S37=11N0DT :*Connect 14400 only 2
AT&Q5S37=9N0DT :*Connect 9600, negotiate Protocol
AT&Q6S37=9N0DT :*Connect 9600 only
AT&Q5S37=6N0DT :Connect 2400, negotiate Protocol
AT&Q6S37=6N0DT :Connect 2400 only
AT&Q6S37=5N0DT :Connect 1200 only
AT&Q6S37=1N0DT :Connect 300 only
* for all V.32 modems 2-for V.32bis modems
NOTE 1: The above strings are using buffering which allows the computer to
have a higher speed than the modem. If you still have trouble try &Q0 in
place of &Q6 and set your computer speed the same as the modem speed.
NOTE 2: I discovered when a user couldn't connect to a 300bps modem, that
if I did AT&F (set &C0&D0) before using the dial prefix, then it would
connect. This is worth a try on stubborn 1200bps modems too.
NOTE 3: If none of these work, fax me the number and I will test it to see
if I can get a connect, and at what speed.
NOTE 4: The new LC (Low Current) modems use the command Fx (F1 F2 etc) to
set modem speed. Replace the S37=xNx commands above with the Fx. (see your
manual for speed)
NOTE: 5 If you try to force a speed higher than the other modem can
connect, you will get NO CARRIER. Set your modem speed to the software
speed just above the modem's highest speed (14,400 set 19,200 - VFast set
38,400) and let the modem negotiate whenever possible.
Connect result messages / modem speed
S95=0 gives you CONNECT (modem to computer speed). If you need
CONNECT speed the same as CARRIER (modem to modem) use S95=1. When running
a BBS, try S95=3 and you will get only CONNECT (carrier) message, with
\ARQ for error correcting modems. Always set your 'speed' in your program
to a high computer - to - modem speed (19,200 / 38,400). The V.32xx or
V.42bis modem will take care of modem to modem speed.
Don Hinds - Zoom Tech
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