In order for the modem performance to be monitor you must first specify a log file for the modem. Open the Modem applet in the Control Panel, click on the Properties button, select the Connection tab and press the Advanced button. Check the "Record a log file" box at the bottom of the dialog. When the modem is connected using a 32 bit communications program then an additional category will appear in the System Monitor with the modem driver's name. Possible items for the modem are "Bytes Received" and "Bytes Sent". Once you have selected these items, those settings will remain in your Systems Monitor, even when the modem is not in use.
The line graph for the number of bytes received and sent is illustrated in Figure 35.
Figure 35. System Monitor of Bytes Received and Sent by a Modem
In Windows NT the number of bytes send and received in the current communications session can be displayed directly for the Dial-Up Monitor.