Physically Connecting and Tracing Ethernet Cables

We just recently remodeled out office.  Previously, the area we remodeled was one very large room which we've split into four offices.  This large room had multiple Ethernet outlets all which led to a data closet where the cable all come together and just hang with not end on them so that the individual wires are exposed.  There are probably 40 separate CAT5 cables that come together here.  Each of the new offices have 2 Ethernet outlets in them, one on either side of the office.  I need to somehow trace these down to their source in the data closet.  I know I can buy a tool of some kind to do this but didn't know if maybe there was some simple homemade tool or trick that I could utilize.  
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JohnBusiness Consultant (Owner)Commented:
The frequencies involved are fairly high, and unless you are unusually adept, building a home made ethernet tester is probably not in the cards.

Since this is a one-time thing (as I read it), you would be best to engage a network consultant and have the cables traced to their origins and then (equally important) tested for signal quality and strength.

... Thinkpads_User

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Just get an inexpensive tone / probe kit
Plug a tone generator into the port in the wall and use the probe to run across the wires and find the one beeping.

Sure you can try to make some DIY cable tester with battery and led, but you can find some basic testers just for 20-40$.
If you really want to make sure that all cables and connectors are ok, I would recommend that you get some decent tester (eg: Fluke).
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To elaborate on Tosiisoa answer check this site out:
JohnBusiness Consultant (Owner)Commented:
It escapes me why one would purchase a specialized meter for one use. However, let us see what torttion thinks.   ... Thinkpads_User
A toner and probe may be specialized equipment, but they can speed up cable identification considerably and won't necessarily break the bank.  Considering that one can usually trace and ID a cable in less than 15 seconds with a toner versus minutes to strip off insulation and electrically test wires on each cable, the investment can easily pay for itself on first use if we're talking 40+ cables.  While the fluke linked above is an excellent kit, I've had just as much success using a generic kit that only cost $23.  I'm not sure of the policy here regarding linking merchandise sites, so I'll just list the product model and let the interested parties Google it themselves.

Cen-Tech 94181 Cable Tracker

JohnBusiness Consultant (Owner)Commented:
Thank you and good luck going forward. ... Thinkpads_User
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