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LT winmodem TX speed

Posted on 1998-09-10
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Last Modified: 2010-04-22
I have a PCI LT winmodem on my NT at work, and an ISA LT winmodem at home (win98). Both are working ok.
How do I setup (init, S registers, etc) my receiving winmodem to accomodate higher TX speeds over RX speeds.
I am only using it with RAS as a receiving modem, but it's probably not set up to maximize upload speed. BTW both have 5.18 drivers (v.90) and when used to dialout to a V90 isp - they work fine.
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Question by:googol
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graham_leach earned 400 total points
ID: 1637981
Assuming that your Linux system has recognized the PCI MODEM as a device:

When you say WinModem do you mean the sort of modem that offloads processing to a device driver that has to be loaded within the Windows Environment, like the USR Sportster Si?

Unless the manufacturer has a device driver specific for Linux, your chances of getting these modems to work at optimal levels is not good.

Questions to qualify a proper answer:

Who manufactures this modem?  
What does "accomodate higher TX speeds over RX speeds" mean?  
What are you trying to accomplish with this modem?
Which modem is the receiving one?
Are you trying to accomplish duplex or simplex communications?

In general, most MODEMs will work with the following string

AT &F

This sets the modem to Factory Default settings.  What that means is that it gets RID OF any icky settings that may be stored in the MODEM and preventing it from functioning in a generic environment, which most MODEMS are programmed to do "out of the box".

I suggest that you visit your manufacturers www site and also visit the following site for more information on the AT command set in general:

www.modem.com

As a rule, the following set of commands can be used pretty safely:

AT &D2 &C1 S95=15

Your MODEM may require more exotic settings, especially if you are trying to squeeze maximum performance out of it.

P.S.  Don't forget to set your serial port to 16550 via setserial or /etc/rc.d/rc.serial or any amount of tweaking your MODEM will come to nothing.
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