The SuperLooper can be used to check ISDN (BRI) cabling for broken or shorted wires and networking interfaces for the simplest functionality. When installing primary network backbone circuits, the simple check of an ISDN (BRI) interface or jumper cable using the ISDN (BRI) Loopback Jack and Plug can save hours of infrastructure downtime. The ISDN (BRI) Loopback Jack and Plug can be plugged directly into the network interface port or onto the cable to be tested.