character through the DTE interface to the ISDN TA will discontinue the test.

B1/B2 Loopback with Self-test (AT&T11)

There is an AT command designed for testing the readiness of your ISDN line which uses one B-channel (B1) to place a call and the other B-channel (B2) to receive the call.

Follow these instructions to make your test call:

Type:

AT&ZOI=your_isdn_number<Enter>

TA responds:

OK

Type:

AT&T11<Enter>

TA responds:

OK

Dial your_isdn_number

Loop from B1 to B2 through the switch established!

Sending and receiving data.....

B1/B2 loopback test successed.

Disconnecting.....

NO CARRIER

The Diagnostic Command (ATCG)

The ATCG command can be used to test and isolate hardware problems. Some of the tests are interactive operations, just follow the indications prompted on the screen. If the TA is operating normally, the test results will be displayed as follows:

System address & data bus test

OK

Layer 1

hardware test

OK

Layer 2

hardware test

OK

Layer 1

activation test

OK

First B channel hardware test

OK

Second B channel hardware test

OK

Listen to the Ring and then pick up phone set #1

!!

Off-hook action is detected, (Hook Interrupt)

OK

Listen to the dial tone and then dial 1234567890*# in sequence.

!!

1234567890*#

 

102 Diagnostics

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ZyXEL Communications omni series user manual B1/B2 Loopback with Self-test AT&T11, Diagnostic Command Atcg