The MDF was on the 4TH floor with phone system. A 110 had 24 pairs running to the basement to another 110. I punch down and connect the phone system By rj 45 at the phone system. I toned it at the basement but only 1 pair was ringing. My main concern was 1,2,4,5. I connect my cable tester but only 1 pair shows continuity 1&2. Did I screw up or is the 24 pair crossed? It's haunting me.