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|T1 Loopback plug for testing both Line and CSU/DSU|
|Article Id #: 435|
A loopback cable redirects the output back into itself. This effectively gives the network interface the impression that it is communicating on a network, since its able to transmit and receive communications.
Therefore on any Smartnode,when the loopback cable is connected on any port and we enter "show port e1t1/ethernet (Port#)" on the CLI or even click on status of the port on the Web GUI, it should show as "Active" on that port.
You'll need a Cat5 cable end, some Cat 5 cable (just a few inches needed), and a Cat 5 cable crimper & cutter.
1. Cut off about 2 to 4 inches of a Cat 5 cable
How to use the loop plug
1. Let your ISP know you have a loopback plug.
It IS possible for the test to be good through the loopback plug and there STILL BE AN ISSUE with the local phone company's wiring. In rare cases, the copper pairs may be "rolled." This means that the 4 wires used to provide the T1 service are wired in reverse where Transmit 1/Receive 1 are actually wired to Transmit 2/Receive 2 somewhere along the route. In this case, the loop test will perform properly, but the T1 service will not work. If you suspect this, you should ask the ISP to dispatch the local phone company to "Prove through the demarc/Smart Jack." This will force the local phone company to dispatch to your site and test head-to-head with the local Central Office to prove the service is good. There sometimes may be a charge associated with this dispatch IF IT IS FOUND THAT YOUR EQUIPMENT OR WIRING IS THE CAUSE OF THE OUTAGE.
Ultimately, the ISP is "responsible." However, having this simple piece of network test gear can speed up the process of a T1 repair and troubleshooting. In the end, restoring your service as quickly as possible is the ultimate goal and this will help you achieve that goal!
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