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CSMIM-T1 Hardware Installation Guide 6-17
6.6.3 Local Analog Loopback
Local Analog Loopback tests the local serial port and the local computer.
This test requires you to type a sequence of characters at your computer.
The modem then sends these characters back to your computer. You
initiate a Local Analog Loopback test by using the &T1 command.
Using Commands to Perform a Local Analog Loopback
To initiate a Local Analog Loopback:
1. Type: AT&T1<Enter> (must be the last command on the line).
2. Type a sequence of characters.
The characters on your display should match exactly the characters you
type. This test mode continues for the time set with register S18, or until
you manually terminate the test. To manually end the test, enter command
state and type: AT&T0<Enter> To end the test and hang up, type: ATH
<Enter>.
6.6.4 Remote Digital Loopback with Self-Test
Remote Digital Loopback with Self-Test tests the remote modem port, the
telephone line, and the local serial and modem ports. When the modem is
set to Remote Digital Loopback with Self-Test, it sends the remote
modem a special test data sequence, and the remote modem echoes this
data back to your modem.
To initiate a Remote Digital Loopback with Self-Test:
1. Dial the number of a remote system configured to accept a Remote
Digital Loopback request.
2. When the modems connect, return to command state and type:
AT&T7 <Enter>.
When the test is complete, the screen displays a 3-digit number that
represents the number of errors. For example:
AT&T7
(no display during test)
000
OK
The test continues for the time set with register S18 or until you terminate
the test by typing AT&T0 <Enter>, or ATH <Enter> to end the test and
hang up.