ADTRAN XRT - Manual (Page 44)

Chapter 3. Installing an Analog Modem
32 Express XR/XRT Quick Start Guide 61200.153L1-13
Figure 3-2
Express Configuration Wizard: Connecting an External Modem
If the Express Configuration Wizard software cannot detect the
external analog modem, the error message shown in Figure 3-3 is
displayed. Ensure the external analog modem and the Express
XRT are powered On and the external analog modem is properly
connected to the Express XRT.