Multitech MultiModemISDN MTA128ST-USB, Руководство пользователя

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Chapter 5 - Troubleshooting
MTA128ST-USB
You cannot place two simultaneous data calls
• You may not have ordered an ISDN line configuration that supports two simultaneous
calls. Check your contract or latest statement of service from your ISDN provider.
Also, your ISDN provider may have programmed the switch incorrectly. Call the
provider.
• You may have misconfigured your MTA128ST-USB to dial two simultaneous data
calls. The command AT&J1&W0<cr> is used to indicate whether outgoing calls
should be made on two B-channels by default.
• You may be using the wrong bundling dial modifier (e.g.,
ATD7853500&7853502<cr>). The ampersand in this command string is correct.
Other valid characters joining two telephone numbers include a plus sign (+) and an
exclamation mark (!).
Note: In Windows 98/95, if the Use Country Code and Area Code box is checked in the
Properties window for dial-up connection, the bundling modifier (i.e., &, + or !) is removed
from the dialing string when the user attempts to make a connection. The solution is not to
check the Use Country Code and Area Code box or to simply add the bundling dial modifier
to the phone number at the time of connection.
The MTA128ST-USB disconnects while online
• Check for loose connections between the MTA128ST-USB and the computer, the
ISDN jack, and AC power.
• The problem may have originated at the other end of the line. Try again.
• If you were online with a BBS or online service, it may have hung up on you because
of lack of activity on your part or because you exceeded your time limit for the day.
Try again.
The MTA128ST-USB cannot connect when answering
• Autoanswer may be disabled. Turn on autoanswer in your data communications
program or send the command ATS0=1 to your MTA128ST-USB in terminal mode.
Note: If the user wishes to accept calls while DTR is low, the MTA128ST-USB must be
configured to ignore DTR. This is accomplished by entering AT&D0<cr>. With this
configuration, the MTA128ST-USB is able to accept calls while DTR is low. If this
configuration setting is not made, the TA rejects incoming calls until DTR is high while the
calls comes in.
File transfer appears slower than it should be
• If you have several active USB devices on the same USB link, try deactivating one
device at a time to see of the transfer rate increases. USB devices on the same USB
link share the same bandwidth of the USB link. There may be several devices using
a large amount of bandwidth (such as a USB removable, media disk drive) leaving a
small amount of bandwidth for the MTA128ST-USB.