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Troubleshooting
142 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD
This chapter covers common problems you may have with your ISIHP and
how to solve them. The ISIHP was thoroughly tested at the factory before
shipping. If you are unable to connect successfully, or if you experience
data loss or garbled characters, during connecting, it is possible the modem
or terminal adapter is defective. However, it is more likely that the source of
your problem lies elsewhere. Always make sure all hardware is connected
properly. Then review the common problems listed in this chapter for
recommendations on what to change or do. Problems you may encounter
include the following:
The TA/modem does not respond to commands.
The TA/modem dials but cannot make a connection.
You can place data calls but not voice calls, or vice versa.
You cannot place two simultaneous data calls.
The TA/modem disconnects while online.
The TA/modem cannot connect when answering.
File transfer appears slower than it should be.
Data is being lost
There are garbage characters on the monitor
If you experience problems, please check the following possibilities before
calling Tech Support (see Chapter 6).
The terminal adapter does not respond to commands
Make sure you issue commands from the data communications
software, either automatically or manually, in terminal mode. (You
cannot send commands to the TA/modem from the DOS prompt.)
Make sure you are in terminal mode in your data communications
program; then type AT and press ENTER. If you get an OK response,
your connections are good and the problem likely is in your
phonebook entry or session settings.
If you dont get an OK, the problem may still be in the
communications software. Make sure you have done whatever is
necessary in your software to make a port connection. Not all
communications programs connect to the COM port automatically.
Some connect when the software loads and remain connected until
the program ends. Others, like MultiExpress Terminal, can