Multitech MT5600DSVD2, Руководство пользователя

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MultiModemDSVD User Guide
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click Advanced , and select the new port address and/or interrupt. If you wish 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 on My Computer, select Properties from the
menu, click on the
Device Manager
tab, double-click on
Ports
, then double-click
on the communications port your modem is connected to. In the port’s Proper-
ties sheet, click on the Resources tab to see the port’s input/output range and
interrupt request. If another device is using the same address range or IRQ, it
will appear in the
Conflicting Device List . Uncheck 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 device’s documentation.
4
The serial port might be defective. If you have another serial port, install the mo-
dem on it, change the COM port setting in your software, and try again.
4
The modem might be defective. If you have another Multi-Tech modem, try
swapping modems. If the problem goes away, the first modem is possibly defec-
tive. Call Tech Support for assistance (see Appendix D).
The Modem Dials But Cannot Connect
There can be several reasons the modem fails to make a connection. Possibilities 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.
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 ENTER.
When you dial again, the modem will report the call’s progress.
4
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 installation. 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 company 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 your PBX manual to see if you
can change the internal dial tone; if you can’t, change your modem’s initializa-
tion 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).