AT&T DataPort PCX Modem User Manual page 57

AT Commands and S-Registers
Table B-1. AT Command and S-Register List (18 of 21)
AT Command/
S-Register
&T n
&V n
&W n
B-18
Issue 2
Description
TESTS
RPI must be disabled before test commands can be
used. Set AT+H0 to disable RPI.
Initiates and terminates Loopback and Pattern tests.
Only one test can run at a time. The modem must be
in Buffer or Direct mode (\N n ).
If the modem is not offline (disconnected) for tests
&T1, and &T8, the tests will take it offline. The modem
must be online (connected) for tests &T3 and &T7.
When tests &T7 and &T8 end, the modem sends the
DTE a message showing the number of 1,024-byte
blocks in error.
&T, &T0 Stops test in progress and displays results.
&T1 Local Analog Loopback test.
&T3 Local Digital Loopback test.
&T4 Accepts request for Remote Digital
Loopback test received over the VF line.
&T5 Denies request for Remote Digital
Loopback test.
&T6 Remote Digital Loopback test.
&T7 Remote Digital Loopback test with Pattern.
&T8 Local Analog Loopback test with Pattern.
S18 determines how long a test runs.
VIEW CONFIGURATION OPTIONS
&V, &V0 Displays current configuration options.
WRITE (SAVE) CHANGES TO MEMORY
Saves configuration options in one of two user areas.
(See also Z and &Y commands.)
&W, &W0 Saves current configuration options to
Stored Profile 0.
&W1 Saves current configuration options to
Stored Profile 1.
July 1995