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14-2
C
HAPTER
14: T
ESTING
THE
C
ONNECTION
Testing the Business
Modem using
AT&T
n
To perform digital loopback and remote digital loopback testing use the
AT&T
n
command. You can type in your own data during testing or use
the modem's internal test pattern and error detector. See the following
sections for more detailed information about each AT&T
n
command.
Example:
Sending
AT&T5
will deny any requests from remote devices for
a remote digital loopback test of your Business Modem.
Disable error control (using the &M0 command, see Appendix B,
Alphabetic Command Summary
) before testing. If the modem is
detecting errors and retransmitting the affected data, your results will be
invalid.
For your modem to Command
End testing
AT&T0
Enter analog loopback (AL) mode and send a CONNECT
message. Data is shown on your screen.
AT&T1
Enter analog loopback mode and send a CONNECT
message. The Business Modem sends a internal test
pattern to the transmitter and loops the pattern back to
the receiver. No data is seen on your screen.
AT&T2
Start local digital loopback testing
AT&T3
Grant a remote digital loopback test of your Business
Modem
AT&T4
Deny a remote digital loopback test of your Business
Modem
AT&T5
Start local digital loopback testing
AT&T6
Start remote digital loopback with self-test and error
detection
AT&T7