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If your modem is taking more than 15 seconds, after the other modem answers, to
train up (handshake with another modem) and/or you are only getting about 26 Kb
or less out of your 56 KB modem connection... then you have a problem.
The problem may be:
Here are a few suggestions that you might try to determine the source of your
problem. Once the problem is determined, it may be correctable.
1. House Wiring Problem?
To correct it you can look for the problem in the house wiring (cross talk caused
by having two lines in the same cable, unterminated long loops, phone cable too
close to AC wires, microwaves, refrigerators, motors etc.). Or you can run a new
line from the D-MARK straight to your computer (similar to the test cable, but for
a permanent installation go through an
isolation splitter ($85.00 and up) since you may also
want to use your phones. Put the computer in one port and the house wiring in
another port.
2. Phone Line Problem?
3. Incompatible Modems?
Each modem manufacturer incorporated one of these two major approaches and some
even used both. When an incompatible X2 modem tried to talk to a K56Flex modem,
or visa versa, they would both fall back and connect at an older slower speed
standard (V.34bis at 33.6 Kb or even V.34 at 28.8 Kb); not at the 56 Kb that
each would support if they were talking to one of their own. The V.90 standard
was supposed to resolve this, but different modem manufactures implemented it
differently and there can still be problems. Add to this the fact that some
ISPs still do not have V.90 type modems.
The long and short of it is that you may have an incompatible modem problem.
To correct it, first go to the manufacturers web site and try to upgrade your
modem to V.90. Don’t forget the modem drivers in the PC, too.
You can also determine which approach your modem supports (K56Flex or X2) and
call your ISP to see if they support it. AOL has had different phone numbers
in different parts of the country to support each.
You may get a "V.90 standard" run-around, but it is certainly worth a
try.
Generally, AT&T, Lucent and Motorola, and most of the others support the
K56Flex approach (Rockwell chip sets) whereas, 3 Com U.S. Robotics supports
the X2 approach.
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