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dial up speed

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Name: dnvrbrncs1
Date: March 19, 2001 at 19:29:21 Pacific
Comment:

how can I increase my dialup speed? in winme i connect at 56k, Linux 26.4. is there something I can do? want to dump win all toeagther but need to get lin 100%
thanks



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Response Number 1
Name: Greg Copeland
Date: March 30, 2001 at 13:04:00 Pacific
Reply:

I'm sorry, but this is slightly funny. I
hate to tell you this, but you've been
"Microsofted". What does this mean? Well,
modems use two data rates. One data rate is
used from the computer to the modem. The
second data rate (true data rate - the rate
at which it is actually being moved over the
phone line) is used from modem to phoneline
(to the other modem). Microsoft and many
modem vendors prefer to configure their
modems to incorrectly report the higher of
the two data rates. It is not uncommon,
however, to have a modem with another OS,
report its true line rate. The result is
that you appear to be getting a much lower
data rate. In other words, you are getting
the same data rates with both OS's. The
initialization string you send to your modem
will dictate what gets reported by the modem.

You may wonder why we would use two data
rates? Well, modems have onboard hardware
compression. In order to prevent data from
siting in a modem for long periods of time
while it is compressed prior to transmission,
the idea is that you increase the data rate
to the modem and dump a big block of data to
it. The modem can now compress the data and
send it onward in the same or less time than
it would of taken it to transmit the same
amount of data to the modem at the lower
baord rate. In this way, you are able to
move more data through the phone line than
would otherwise be possible.

Now, if all that wasn't bad enough, the data
rate reported by you modem at connect time is
nearly worthless! Many vendors send tons of
extra money so that their modems will
negotiate higher data rates initially,
however, within seconds of it being
connected, and after the initial rate has
been reported, modems will often retrain
(renegotiate) to a slightly lower rate.
Having said that, it's also possible, though
somewhat rare, that modems will actually
retrain to a higher rate after connection.
They constantly monitor the line for noise
and attempt to adopt to it (for better or
worse from a data rate perspective).

Last, let me say that for most modem users,
anything above 26.4 is considered good. Most
people never see 33.6. I live less than a
mile from the CO and live in a new area, and
I usually get 44.8. That data rate is
considered to be excellent. Notice that it's
still not 56k (keep in mind, in the US, 56k
modems will only get 52k at max because of
FCC restrictions).


Greg


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