ADTRAN Express XRT User Manual

Page 70

Chapter 6. Troubleshooting

Express XRT User Guide

61202.153L3-1

External Analog Modem Not Detected

If the Express Configuration Wizard cannot detect the external an-
alog mode verify the following:

1. The external analog modem is powered on.
2. The external analog modem is properly installed and config-

ured for use with the Express Configuration Wizard. See Con-
figuring an External Analog Modem on page 30 for more details
on the required settings.

Difficulty with 230.4 kbps Operation

If the Express XRT does not work when the DTE rate is set to 230.4
kbps inside Windows, verify the following:

1. Verify that dip switch 1 on the back of the Express XRT is set to

off (up).

2. Verify that a high speed serial card with a 16650 UART is being

used and the software drivers to support the extended baud
rate tables are installed.

Dial-Up Networking Difficulty

If Windows 95 Dial-Up Networking cannot talk to the Express
XRT, check the modem configuration for the Express XRT. Ensure
the bit rate for the DTE is set correctly. If the PC is not equipped
with a 16650 UART, then the fastest DTE operation speed is 115.2
kbps. Ensure the speed is not higher than the PC and modem can
support.