troubleshooting Question

Cabling 25 pair telco tone set ringing out a single pair

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BeGentleWithMe-INeedHelpFlag for United States of America asked on
NetworkingNetworking Hardware-OtherNetwork Operations
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Related to another question I just posted.

Old building with loads of 66 blocks / 25 pair cables / cross connects all over the place.

I have a tone set and a phone acting as a butt set.

I have a 4 pair wire going to a jack on 3rd floor.  I assume it goes from the 2 pair wire to a 66 to 25 pair cables, etc. etc. to the basement 66 block.

I can put the tone generator on a pair on that 4 wire jack and hear it on the 66 block in the basement, but how do I know exactly which pair it is downstairs. Yes the tone probe seems to indicate approximately what pair on the 66 block, but there's several pairs in that area (it's a split 66 block).   how do I know for sure? what tools do I need?
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