ADTRAN TECHNICAL SUPPORT NOTE

Troubleshooting an Alarm Condition on ADTRAN TSU Products

Introduction

An alarm condition on an ADTRAN TSU product indicates a possible problem on the T1 circuit. This Technical Support Note will help you determine the cause of that alarm.

Determine the Specific Alarm the TSU is Reporting

1. Using the arrow keys on the front of the unit, select Status, then press the Enter button.
2. If you have:
   • TSU, TSU ESP, TSU LT, TSU ACE or TSU RM:
     1. Use the arrow keys to scroll down to the CURR ERR/ALM menu item, then press the Enter button.
        
     2. Use the arrow keys to scroll down and record the alarms that report ACTIVE.
     
     
   • TSU 100, TSU/TDU 120 or TSU 600.
     1. Use the arrow keys to scroll down to the ACTIVE ALARMS menu item, then press the Enter button.
        
     2. Use the arrow keys to scroll down and record the alarms that report ACTIVE.

Perform Loopback Test

NOTE: The following steps will require interrupting your data service.

1. Locate the network cable on the back of the TSU. (It will be plugged in the NETWORK jack.)
2. Follow the cable to where it plugs in the wall jack (demarc, smart jack...).
3. Unplug the cable from the wall jack.
4. Plug the cable end removed from the wall jack into the loopback connector attached to the power cord of the TSU. (See Figure 1)
5. Check the status of the alarm indicator on the front of the TSU.
   • If lit, contact ADTRAN Technical Support for assistance.
   • If not lit, the ADTRAN unit is looping back correctly and you will need to report the alarm condition to your T1 service provider.

FIGURE 1

If you experience any problems using your ADTRAN product, please contact ADTRAN Technical Support.

DISCLAIMER ADTRAN provides the foregoing application description solely for the reader's consideration and study, and without any representation or suggestion that the foregoing application is or may be free from claims of third parties for infringement of intellectual property rights, including but not limited to, direct and contributory infringement as well as for active inducement to infringe. In addition, the reader's attention is drawn to the following disclaimer with regard to the reader's use of the foregoing material in products and/or systems. That is: ADTRAN SPECIFICALLY DISCLAIMS ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ADTRAN BE LIABLE FOR ANY LOSS OR DAMAGE, AND FOR PERSONAL INJURY, INCLUDING BUT NOT LIMITED TO, COMPENSATORY, SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR OTHER DAMAGES.

Last modified: Friday, July 27, 2001.