Checking instruments perform basic continuity operations, making sure that all wires in a wiring link are connected to the appropriate break points and not to another conductor. It is essential to maintain the correct pairing of wires in twisted pair cabling. The best verification testing tools also verify wire pairing and detect installation faults such as 'split pairs'. Verification test tools can also aid in troubleshooting by generating a dial tone to locate a wiring link. Verification test instruments sometimes include additional functionality, such as a Time Domain Reflectometer (TDR) to determine the length of the hardwire link or locate an open or short circuit on the link under test. These test instruments do not provide any information on bandwidth or suitability for high speed data transmission.
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