Product Dimensions : 5.1 x 3.3 x 0.8 inches 0. Check wall jack to network switch connections.Check cables for broken or shorted wires.Plug the Loop back Jack & Plug into any network. In order to perform a loopback test of the e1/t1 port, a loopback plug (also known as loopback connector or loopback cable) is needed. Loopback, Bert, FDL (T1 only), and Long Buildout diagnostics. ![]() Small, convenient, and economical for network technicians.Color coded by network type for quick recognition.If a signal is present T1 Loopback Plug sends the signal back to the source illuminating the port light. It can be plugged directly into a T1 CSU/DSU or can be attached to the end of a network patch cable. The loopback SuperLooper rapidly tests the TX/RX pairs of T1/E1. This effectively gives the network interface the impression that it is communicating on a network, since. These handy SuperLooper plugs are great for working with and testing T1/E1 (DS1) cables. A simple and compact product, The T1 Loopback Jack and Plug quickly and easily checks the RX/TX pairs of T1 circuit cables helping to determine if a signal exists. A loopback cable redirects the output back into itself.
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