Actiontec electronic 56K V.90 - Manual (Page 29)

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Step 18 In the dialog box that appears next, click the Diagnostics tab to bring it to
the front, then click Query Modem. After windows has communicated with
the new modem some AT commands and their responses will appear. Scroll
through this section of the dialog box until you see the commands and
responses displayed below.
If the displayed responses are similar to those shown above, the modem and
its correct driver have been installed correctly.