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Chapter 6. Troubleshooting
61202.153L3-1 Express XRT User Guide 55
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.