Re: Holy Sh_i_t...... Modem speed thru the roof

[Guest Franc Zabkar]

Re: Holy Sh_i_t...... Modem speed thru the roof

 

On Thu, 25 Sep 2008 02:07:46 -0500, letterman@invalid.com put finger

to keyboard and composed:

>My modem got killed by lightning (again).

>Seems I lose 2 or 3 each year. This is the price one pays for living

>in the country. Anyhow, I got a used US Robotics V-Everything this

>time. I am getting 57,600bps. on dialup, using Win98se. I have never

>gotten more tham 46K with any other modem. Is this just a better

>modem, or what?

 

DUN is reporting the DTE speed instead of the DCE speed. The former is

the speed of the COM port, the latter is the modem-to-modem speed.

 

You have two problems. The first is that your port speed should be set

to 115200bps to take advantage of data compression. The second is that

your modem has been installed with the wrong INF file.

 

When your modem connects, it informs DUN with a response such as

CONNECT 46666. If this response is not in the INF file, then DUN is

unable to interpret it, in which case it reverts to reporting the port

rate, which in your case is 57600bps.

 

A low port rate restricts the throughput for compressible data. For

example, a typical compression ratio for text data is 2:1, so if

you're connecting at 46666bps, say, then your data rate wants to go as

high as 93000bps. However you would need to increase your port speed

to 115200bps, otherwise your COM port would limit you to only

57600bps. You also need to reinstall your modem with the correct INF

file, otherwise DUN will now report a connect speed of 115200bps.

 

You can see the *real* connect speed in your modemlog:

http://www.modemsite.com/56k/modemlog.asp

 

If you want to know how good your modem and phone line really are,

then ...

 

Information your modem can tell you about your connection (retrains,

error rates, speedshifts, etc):

http://www.modemsite.com/56k/diag.asp

 

Your USR modem is also able to plot the frequency response of your

phone line:

http://www.modemsite.com/56k/x2-adconversion.asp

 

More modem stuff:

http://www.modemsite.com/56k/trouble.asp

 

BTW, my first reply didn't go through. I suspect that Microsoft's

moderator bot discards any post containing the word "sh_i_t". This

means that anyone getting their news feed from Microsoft's news server

would not have seen your post.

 

- Franc Zabkar

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