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Cabling 25 pair telco tone set ringing out a single pair

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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sanjayrajt
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sanjayrajt
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touch blue and white at far end when the tone generator with light is at the other end? really need 2 people then?
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sanjayrajt
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Hi,
yes.first you find the color code connect the equipment one end and go to another end find the color code of cable and do testing.If you can only need one or two cables you can find your self.Other wise you need two people.
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Networking

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

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