Run modem diagnostics and adjust maximum speed
Close all programs that use the same communications port as your modem, such as any fax software, HyperTerminal, or Phone Dialer.
On the Start menu, point to Settings, and then click Control Panel.
Double-click the Modems icon.
In the port information section, make a note of the highest speed your UART (Universal Asynchronous Receiver Transmitter) can support.
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