Multi-Tech MultiModem ISDN MT128ISA-UV, User Manual

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Chapter 4 - Troubleshooting
MT128ISA/PCI
Q: How can I update the ISDN driver to a new version?
A: Download the latest ISDN PC adapter driver form Windows 3.1, 95, 98, NT and 2000 from our web
site at http://www.multitech.com. In Windows 3.1 you must uninstall the ISDN driver by clicking the
uninstall icon and installing the new version. In Windows 95 and 98, run UPGRADE.EXE to update
the driver automatically, then reboot your system. In Windows NT, remove the existing driver, reboot
your system and install the new version. You will need to reconfigure the software for your ISDN
switch type.
Q: Why can’t I use HyperTerminal to dial?
A: Make sure HyperTerminal is configured with a virtual modem corresponding to the ISDN COM
port. If you do not have two virtual modems with ISDNCom ports added use Start>Settings>Control
Panel>Modems>Add. Select Have Disk and locate the proper file in the modem subdirectory of the
installation diskette.
Make sure the same protocol is used on both sides. Refer to the ATBn command (see Chapter 3) to
set up the correct protocol used on the B channel. ATI will display the current settings.
Q: Why can’t I make a data connection through HyperTerminal?
A: Ensure the client and remote sides of the connection are using the same protocol to make a data
connection. You may use the ATBn command to set the protocol (refer to AT Commands in Chapter 3
of this manual). Enter ATI to display information such as Software version number, B channel
protocol, connection speed, packet size, current MSN and current outgoing phone number for billing.
Q: How can I monitor the ISDN line and make sure the ISDN card and line are working properly?
A: When the system boots up and invokes the ISDN driver, the driver will initialize the ISDN card and
selftest the IRQ, I/O, and chipsets. If you do not see any error messages, the ISDN card and driver
are working properly. In Windows 2000, you may run LINETEST.EXE to perform a line test. It will ask
you to enter an ISDN telephone and make a call. Enter a local number to do a loopback test from
your site to the ISDN switch. This will ensure the D and B channels are working properly. Error
messages 3301 and 3302 indicate a problem with the ISDN line.
Q: How can I enable Caller ID in HyperTerminal?
A: The driver does not display Caller ID as a default. If you want to enable Caller ID, enter the
command, AT#C1 and AT#C0. To disable Caller ID, enter AT#C? to give the current status of Caller
ID mode. This function is provided in Version 2.13 and later.
Q: Why does the Internet connection not work when I upgrade to V2.13 or later?
A: When you upgrade to V2.13, you’ll need to remove the existing virtual modems and read them into
the system. You can add the virtual modems using the following steps:
1. Start>Settings>Control Panel>Modem>Add>Select Don’t detect my modem, I will select it from
a list. Next>Select the modem and click Have Disk. Browse to the location of the installation
diskette and select MDMASU.INF. Click OK> select the ISDN Universal-1 Modem, Next>
associate this modem to ISDN COM port 1.
2. Use the previous step to select the ISDN Universal-2 Modem > associate this second modem to
ISDN COM port 2.
Note: You may also use the Async to Sync PPP modem or the X.75 transparent modem You’ll also
find these files in the modem sub-directory of the installation disk.
Q: Why can’t I see the correct characters in the HyperTerminal screen when I get a connection with a
remote site?
A: Check to make sure the B channel protocol is the same on both sides of the connection.
Check that the character is 8-bit ASCII or 7-bit ASCII. You can disable the first bit of 8-bit ASCII to 7-
bit ASCII by opening the HyperTerminal settings and changing the terminal type to VT100. Click the
ASCII Setup. In the ASCII receiving section, select “Force incoming data to 7-bits ASCII”. Click OK.