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&T8 Local analog loopback with self-test. This test checks
the operation of your modem's transmitter and
receiver. It sends an internal test pattern through the
loop and returns a numeric message that indicates
the number of errors that were counted during the
test period. (See &T1.)
For example:
1.
2.
3.
4.
5.
&V
View Profiles Command. This command displays the
active modem profile, the user-defined profiles, and the
stored telephone numbers. (See &Wn and Zn.)
&Wn Store Current Profile Command. This command stores the
active modem configuration into nonvolatile memory
(NVRAM) as user-defined profile 0 or 1. Storable parameters
can be viewed with the &V command and recalled with the
Zn command. To return to the factory defaults, type AT& F0
<Enter>.
&W0 Store the current profile as profile 0.
&W1 Store the current profile as profile 1.
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Your modem should be on-hook and in
command mode. Type AT\N0 <Enter>. This
specifies a normal connection.
Type AT S18=10 <Enter>. This specifies a test
period of 10 seconds.
Type AT &T8 <Enter>. This initiates the local
analog loopback with self-test.
The test will end automatically after 10
seconds. When the test is ended, the modem
will display the number of errors detected. 000
means that there were no errors. 255 means
that there were 255 or more errors.
Return your modem to its original state by
typing ATZ <Enter>.
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