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7.7
MultiMux Functional Testing Procedures
There are tests available on the MultiMux which check various functions within the MultiMux logic. These tests will
assist you in trouble shooting problems which are not related to the composite communications channel or local
channel devices. The two tests described below will check the non-volatile memory used for parameter storage and
internal circuitry, called the Watch-Dog circuitry, which is responsible for keeping the MultiMux functioning normally.
Table 7-5. MultiMux Functional Testing Procedures
Step Procedure
Note: Executing the Battery/Memory test procedures
will result in the destruction of stored parameters.
1 Before checking the battery-backed memory feature, enter an ATL command and record all channel parameters.
2 Place the MultiMux in Test Mode 8 (i.e., executing the non-volatile RAM test) by entering the following command:
AT&T8 (hit Return)
(let the test complete its cycle)
The supervisory console will display the following message:
Memory test - This test will destroy all stored configurations.
Do you wish to continue? (Y/N)
3 Press the Y key (the message writing will appear while the test is running) and the following message will be
displayed on the supervisory console:
Turn power off for 10 seconds and then back on.
Then enter AT to end test.
4 As the message indicates, turn power off for ten seconds, then back on and enter AT and hit Return. Depending
on the condition of the battery, one of the following messages will appear on your supervisory console:
Non-Volatile Memory Test Passed
or
Non-Volatile Memory Test Failed
5 To check the Watch-Dog circuitry, place the local MultiMux unit in Test Mode 9 (i.e., executing the Watch-Dog
Timer Test) by entering the following command:
AT&T9 (hit Return)
The supervisory console will display the following message:
Watch-Dog Timer Test #9 - wait for test indicator to turn off
and when the test indicator comes back on,
enter AT to end test.
6 As the message indicates, after the test indicator comes back on enter the
following:
AT (hit Return)
If the test passes, the following message is displayed:
WATCH DOG TEST PASSED