Question : Identify network cable in a loom

Building has been fully networked but a previous tenant when they moved out took their hub or switch with them by cutting all the Cat 5 just behind the hub or switch.

So, all the connections are there for the workstations to plug into but there is nothing at the other end.  I need to identify which cable goes to which connection so I can redo the cut ends and place a new switch in place.

There is too much cable to rewire and there are two floors to this building.

Is there some sort of device to track or identify a cable in a loom, I presume that the cable would have to be powered in some way at the workstation end.  If there is can you give me some links to the device(s) concerned.

Answer : Identify network cable in a loom

no..it has a tone generator, attach it to the end of the line, then you trace the "live" cable to the end of the trunk.