14-2CHAPTER 14: TESTING THE CONNECTION

Testing the Business

To perform digital loopback and remote digital loopback testing use the

Modem using

AT&Tn command. You can type in your own data during testing or use

AT&Tn

the modem's internal test pattern and error detector. See the following

 

sections for more detailed information about each AT&Tn command.

For your modem to

Command

 

 

End testing

AT&T0

 

 

Enter analog loopback (AL) mode and send a CONNECT

AT&T1

message. Data is shown on your screen.

 

 

 

Enter analog loopback mode and send a CONNECT

AT&T2

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.

 

 

 

Start local digital loopback testing

AT&T3

 

 

Grant a remote digital loopback test of your Business

AT&T4

Modem

 

 

 

Deny a remote digital loopback test of your Business

AT&T5

Modem

 

 

 

Start local digital loopback testing

AT&T6

 

 

Start remote digital loopback with self-test and error

AT&T7

detection

 

 

 

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.

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3Com 56K manual Testing the Business, Modem using, AT&Tn