Toshiba V.90 - Manual (Page 78)

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Test Function
Normally, data communications are executed by connecting your
computer and modem to those of a remote station with a
communication line. If any errors or malfunctions are
encountered, it is necessary to check whether the cause is in the
local station, the remote station or the communication line.
Test description
This internal modem has a local/analog/loopback test function that
identifies the cause of a malfunction. You can use the test to check
errors in data communications or to check operation following
modem connection.
When conducting a test, use the &T command to select test mode
and control. For details on the &T command, refer to
“&Tn Self-
test commands” on page 28 .
In this test, data is transmitted from the computer, is looped back
(analog/loopback) within the modem from the transmitter to the
receiver, then sent back to the computer. The test enables you to
check whether the computer and modem are working properly.