Thus Quad wire should not be used with multiple lines, key systems, PBX systems, digital phone sets, or data applications. In commercial applications, test horizontal runs prior to cross-connecting at the telecommunications closet, if one is present. There should be no continuity between any of the leads and earth ground. Then connect the battery across the Tip and Ring leads of each pair at the closest point available to the demarcation point, but not on the network side. Connect the positive side to Tip and the Negative side to Ring.
Most continuity testers provide one or more LEDs to indicate shorts, opens, and polarity.
The tester provides battery voltage and if a short exists, the appropriate LED will light. With the leads unterminated at either end, connect the continuity tester across the leads of each pair in succession. Test also at the outlet for continuity between the Tip lead of each pair with all other leads, and then the Ring lead with all other leads, to assure that there are no shorts to them. Then short the far end by metallic means. The tester will light the appropriate LEDs to indicate proper polarity.