Within 20 minutes, the school district’s router was working fine.Ĭisco has a document on their web site that tells you how to make a loopback plug, but if you don’t know about it, you won’t go looking for it. Sure enough they “discovered” that they couldn’t loop their smartjack and that the problem was with their equipment at the CO (Central Office). They hemmed and hawed and then finally said they would do a loopback “again” on their end. So, I called the telco back and told them that my loopback tested good. The interface came back up just as he said it would. So, I made the loopback plug in the manner in which he instructed me and tested the router. But if I tell them that my physical loopback worked, then they will admit that it’s their equipment, if it is. He also said that the telcos almost always say that it isn’t their problem. If the serial interface came “up and up”, then the router was good and the problem was most likely on the telco’s equipment.
The Cisco tech said that I needed to make a loopback plug, remove the T1 line from theĬSU\DSU, insert the plug into the DSU\DSU, and enter some commands at the router console. Exasperated, I finally called Cisco’s tech support. The telco tested their circuits and said they were ok. One day I was in Leland, Mississippi trying to troubleshoot a downed T1 connection at the school district’s main office. They mentioned the required commands to enter at the router console, but no mention was made that anything needed to be done physically to the equipment. In studying for the certification tests, mention was made in class, and in the books, about doing loopback tests to help in troubleshooting router WAN connections.
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