|  | 9.7 | Range of Equipment for Testing Structured Cabling Projects
| 9.7.7 | Wire maps
Cable testers use a feature called a wire map to indicate which wire pairs connect to which pins, on lugs and sockets. The test indicates whether the installer properly connected the wires of a plug or jack, or whether he/she connected them in reverse order. When wires are connected in reversed order, they are referred to as crossed pairs. Unique to UTP cable installations, this is a common problem. When crossed pairs are detected in UTP LAN cabling systems, the connections are not good, and must be redone.
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