ADTRAN Express XRT Dial-Up Connection Problems, Auto-detect Switch/SPIDs Remains at Link Down

Chapter 6. Troubleshooting

Dial-Up Connection Problems

Many connection problems can be diagnosed by viewing the sta- tus buffer message returned from the ISDN network and the Ex- press XRT. These messages are accessed by choosing the Status Buffer button in the Diagnostics tab of the ADTRAN Express Configuration window.

The Status buffer can also be accessed using the key sequence Ctrl+V in the VT 100 menu system. Issue the AT command AT!V from a terminal emulation package such as HyperACCESS to in- voke the VT 100 menu system.

Auto-detect Switch/SPIDs Remains at Link Down

Auto-detect is only used in North America.

The Link Down condition persisting for longer than 15 minutes indicates a problem with the ISDN line provided from the tele- phone company. The ISDN physical layer device has not been able to synchronize to the network. Ensure the RJ-45 to RJ-45 ca- ble is correctly installed between the Express XRT and the NT1 and that the Express XRT is powered on. Call the local telephone company and have them check the ISDN line for correct opera- tion.

Express XRT Not Detected

If the Express Configuration Wizard cannot detect the Express XRT verify the following:

1.The Express XRT is powered on.

2.No other applications are running that could be using the COM port to which the Express XRT is attached. A Windows appli- cation does not have to be active to tie up a COM port. Be sure to check the Windows 95 Taskbar for any suspended applica- tions (such as HyperTerminal and HyperACCESS) that may be using the COM port. If any are minimized, these must be closed before starting the Express Configuration Wizard.

3.If you are operating the Express XRT at 230.4 kbps, ensure that dip switch 1 on the rear panel is off (up). This is required for operation at 230.4 kbps. Also, confirm that the computer has a 16650 UART.

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