User guide

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Chapter 6 - Troubleshooting
change one of the conflicting devices to use one of the unused IRQs. If you find an address conflict,
change the address of one of the conflicting devices.
To change a port address or IRQ in Windows 3.1x, double-click the Control Panel icon and then the
Ports icon. Click the port you want to change; then click Settings and then Advanced and select the new
port address and/or interrupt. If you want to use COM3 or COM4, note that COM3 shares an IRQ with
COM1, as does COM4 with COM2, so you should change their IRQs to unused ones if possible.
If you use Windows 95, right-click My Computer and select Properties. Click the Device Manager tab
and then double-click Ports. Double-click the Communications Port where your modem/TA is connected.
In the port’s Properties sheet, click the Resources tab to view the port’s Input/Output range and Interrupt
Request. If another device is using the same address range or IRQ, it appears in the Conflicting Device
List. Remove the check from Use Automatic Settings to change the port’s settings, so they do not
conflict with the other device. Or, select the port the conflicting device is on and change it instead. If you
need to open your computer to change switches or jumpers on the conflicting device, refer to the your
computer’s documentation.
• The TA may be defective. Call Tech Support for assistance (see Chapter 4).
The terminal adapter dials but cannot make a connection
Possible be several reasons the TA fails to make a connection include:
• Lack of a proper physical connection to the communication line
• A busy signal
• A wrong number
• No terminal adapter at the other end
• A faulty communications device, computer, or software at the other end
• Incompatibility between communications devices
• An improperly configured ISIHx terminal adapter (TA)
Narrow the list of possibilities by using extended result codes. To enable them, enter ATV1X2 and press
ENTER while in terminal mode or include V1X2 in the TA ’s initialization string (V1X2 is enabled by default).
When you dial again, the TA reports the call’s progress.
• If the modem/TA reports BUSY, the other number may be busy. Try again later.
• If the TA reports NO CARRIER, no connection was made. You may have dialed the correct number, but
the other computer or software was turned off or faulty. Check the number and try again or try calling
another system to make sure your TA is working. Also, check that you accurately configured the TA with
the correct switch type, TEIs, data protocols, and other parameters needed for a successful call (see
Chapter 3).
You can place data calls but not voice calls, or vice versa
• You might not have ordered both voice and data service from your ISDN provider. Check your contract or