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If you have problems, first verify that the phone jack is plugged in and that you have a dial tone on the phone line. Note that, while other serial ports are often used, the examples in this section assume that the modem is attached to COM1.
The problems fall into these categories:
If incoming data is being lost on a high-speed modem, then, for maximum performance, increase the trigger level to 14 using the Serial Manager. See ``Configuring a serial port'' for more information.mdmcfgcheck(1M) can be used to check the modem configuration file.