Appendix: Making aLoopback Plug

In This Appendix

• Introducing male loopback plugs

• Setting up female loopback plugs

A loopback plug is the cheapest piece of test equipment you can own. It consists of a small plastic connector and about 10 inches of wire. The loopback plug assists in insolating problems within your circuit and provides a device for your carrier to run to during intrusive testing. This appendix gives you all the information you need in order to get a functioning loopback plug. Check out Chapter 13 for more information on using a loopback plug to facilitate troubleshooting.