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&T5 Prohibits local modem from accepting a request
from the remote modem for a remote digital
loopback test. (See S23.)
&T6 Remote digital loopback test. This test verifies the
operation of two connected modems and the phone
channel.
For example:
1.
2.
3.
4.
5.
6.
7.
8.
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Your modem should be on-hook and in
command mode. Type AT\N0 <Enter>.
Type AT S18=10 <Enter>. This specifies a test
period of 10 seconds.
Establish a connection with the remote
modem by typing AT Dnnn-nnnn <Enter>.
Wait for the CONNECT message.
Issue the escape sequence to put the modem
back into command mode (type +++ without
pressing <Enter>). When you see the OK
message, your modem is in command mode.
Issue the command AT &T6 <Enter>. This
initiates the remote digital loopback test. Note
that the remote modem must support CCITT
V.54 and must be prepared to accept the
request for this test. (See &T4.)
Type a simple character pattern and verify that
what you type is echoed correctly to your
screen.
The test will end automatically after 10
seconds.
When your testing is complete, hang up the
line and return your modem to its original
state by typing ATHZ <Enter>.
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