ADTRAN user manual If SELF-TEST Fails, If the Express L128/L128T does not Read Ready

Chapter 4

Troubleshooting

When the Express L128/L128T powers up, it performs an internal self-test. This takes about 10 seconds. At the end of the test, the PWR LED should flash.

IF SELF-TEST FAILS

If the PWR LED is not on or continuously flashes, the following steps will ver- ify whether or not the problem can be fixed locally.

1.Ensure the Express L128/L128T is receiving power.

2.Power off the Express L128/L128T. Place switch 2 in the off position; then power back up. This will reset all internal settings to their factory default.

3.If the Express L128/L128T still does not pass self-test, call ADTRAN Tech- nical Support for assistance. See the inside back cover of this manual for information on contacting ADTRAN.

IF THE EXPRESS L128/L128T DOES NOT READ READY

When the Express L128/L128T has been set up and connected to a line, but the PWR LED does not remain on after a few minutes, proceed with the following steps:

1.Cycle power on the Express L128/L128T, leaving it off for a minimum of two seconds; then turn the power on for one minute to ensure the PWR LED still doesn’t stay on.

2.Disconnect the Express L128/L128T. From a functioning voice phone, call the local directory number(s) provided with your line. Calling a good ISDN line with nothing connected usually results in a ring or fast busy tone. If someone answers, or you get a not-in-service intercept, there is

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