Resetting the Unit Back to Normal Operation.Important Considerations Before Running the Test.Performing the Loopback Test Using the CLI However, this document does also apply to the E1 as well provided you substitute the 'T1' in the commands given with 'E1'.Įquipment Needed to Perform Loopback Test Note: The E1 is a international equivalent of the T1 interface with some slight differences. If you would like to a video demonstrating the troubleshooting steps in this document, please see.

If provisioning a T1 connection for the first time, please see the Useful Links section of this document to find the proper document to verify your configuration. It is recommended that prior to using this document, you read the document to make sure you understand what types of problems with a T1 warrant consideration of the ADTRAN hardware as a possible issue. By running a quasi-random pattern through the T1 interface, a user can see with certainty if the unit is functioning properly while segmented from the rest of the T1 connection from the provider. When a T1 connection does not seem to be working properly, the most efficient way to troubleshoot the router's physical T1 interface is to run a T1 Loopback Test. A T1 interface provides guaranteed bandwidth and does not have the distance limitations of other protocols making it ideal for certain networks. While high-speed, efficient, and low price Ethernet and fiber lengths have started to become more of the norm in modern networks, the T1 link is still commonplace at many businesses because of its advantages over Ethernet.

E1 loopback plug