Multi-Tech Systems MT5634ZPX-PCI-V92 - Manual (Page 55)

6 Solving Problems
50
MultiModemZPX User Guide
" Another expansion card, such as a sound or game card, might be using the same
COM port, memory address, or interrupt request (IRQ) as your modem. See
Chapter 2 for information on verifying the configuration for your operating sys-
tem. 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 MultiModemZPX-PCI conflict with the resources of another device, the re-
sources 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 MultiModemZPX-PCI, install it and try to make a connec-
tion.
" The modem might have a problem beyond the scope of this user guide. If you
have another Multi-Tech modem, try swapping modems. If the problem goes
away, call Technical Support for assistance (see Appendix D).
The Modem Cannot Connect
When Dialing
Reasons why the MultiModemZPX-PCI may fail to connect 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
poor line conditions.
You can narrow the list of possibilities by using extended result codes. Extended re-
sult codes are enabled by default. If they have been disabled, include V1X4 in the
modem’s initialization string, or in terminal mode enter ATV1X4 and press E
NTER .
When you dial again, the modem reports the call’s progress.
" If the modem reports NO DIALTONE, check that the modem’s telephone line ca-
ble is connected to both the modem’s LINE jack (not the PHONE jack) and the
telephone wall jack. If the cable looks secure, try replacing it.
If that doesn’t work, the problem might be in your building’s telephone installa-
tion. To test the building installation, plug a telephone into your modem’s
telephone wall jack and listen for a dial tone. If you hear a dial tone, your modem
might be installed behind a corporate phone system (PBX) with an internal dial
tone that sounds different from the normal dial tone. In that case, the modem
might not recognize the dial tone and might treat it as an error. Check with your
PBX personnel or the PBX system manual to see if you can change the internal dial
tone. If you can’t, change your modem’s initialization string to replace X4 with
X3
, which will cause the modem to ignore dial tones (note, however, that X3 is
not allowed in some countries, such as France and Spain).
" If the modem reports BUSY, the other number might be busy. Try again later.
BUSY can also indicate that you failed to add a 9, prefix to the phone number if
you must dial 9 for an outside line.