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MultiModem ZPX User Guide 21

until the program terminates. Some programscan disconnect without exiting the program. Ifthis is the

case, try issuing the software’s connection command. If more than one communications program is

open, they may conflict with each other. Make sure all other communications programs are closed and

try to make the connection again.

• If using legacy software, the COM port setting may not match the COM port that Windows assigned.

Compare the COM port setting in your software to the COM port reported in Windows. To view

your modem COM port settings, click Start | Settings |Control Panel and then:

• In Windows 95/98, double-click Modems and click Diagnostics.

• In Windows NT, double-click Modems and click Properties.

• In Windows 2000/XP, double-click Modems and Phones, click the Modems tab. Click

Diagnostics.

• Another expansion card (such as a sound card) may be using the same COM port, memory address,

or interrupt request (IRQ) as your modem. See Determine System Resources in Chapter 2 for

information on verifying the configuration for your operating system. Look for conflicts with other

devices installed on your computer. Resources are assigned at power up by the computer’s BIOS. If

the resources assigned to the MultiModem ZPX conflict with the resources of another device, the

resources of the second device have to be changed. Select the port the conflicting device is on and

change it to resolve the conflict. If you need to change switches or jumpers on the conflicting device,

refer to the device’s documentation.

• If you have another MultiModem ZPX, install it and try to make a connection.

The modem dials but cannot make a connection

Reasons why the MultiModem ZPX fails to make a connection include:

• Lack of a physical connection to the telephone line.

• A wrong dial tone.

• A busy signal.

• A wrong number.

• No modem at the other end.

• A faulty modem, computer, or software at the other end.

• Incompatibility between modems.

Narrow the list of possibilities by using extended result codes. If you disabled the modem’s extended

result codes, enable them by typing ATV1X4 in a terminal window and pressing Enter. When you dial

again, the modem reports the call’s progress.

• If the modem reports NO DIALTONE, check that the modem’s telephone line cable is

connected to the modem’s jack and the telephone wall jack. If the cable looks secure, try replacing

it.

If the problempersists, checkthe building’stelephone installation.Totest the buildinginstallation, plug

a telephone into the modem’s telephone wall jack and listen for a dial tone. If you hear a dial tone,

your modem may be installed behinda company phonesystem (PBX) withan internal dial tonethat

sounds different from the normal dial tone. In that case, the modem may not recognize the dial tone

and may treat it as an error. Check with your in-house telephone switch (PBX) personnel or the PBX

Chapter 4 -Troubleshooting

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Connect Tech Echo/ISA Guia do Utilizador Página 21