Chapter 4, Troubleshooting, Ensure the express xl/xlt is receiving power – ADTRAN 1200070L1 User Manual
Page 123: Power off the express xl/xlt while holding down, Continue holding the select and test buttons un, If the express xl/xlt still does not pass self, Cycle power on the express xl/xlt, leaving it o, Chapter 4 troubleshooting

This manual is related to the following products: