Cat3 25 pair cable can be used for voice or low speed data. There are 50 individual cables inside the jacket.
It is primarily used for voice networks and runs from closet to closet or even from patch panel to patch panel. Also used with
Amphenol style connector for cross connection of voice networks. It is heavier then regular Cat3 cable for it has 25 pairs as
opposed to only 4 pair UTP (UTP Unshielded Twisted Pair). Cat5e and above is used in data networks today.
Cat3 25 pair PLENUM cable cable for inside plenum and non plenum space 25 pair telco cable. When running
closet to closet with multi-pair cable and it is either required by your
building or inspector or you are running through Plenum air space, then you need
Plenum cable and NOT Non-Plenum PVC. You can however, use Plenum cable in place of PVC but not
Plenum 25 pair cable is more expensive then Non-Plenum PVC due to the mix of what must
go into the construction of the cable. Hooking up this cable can be done using the color codes of each individual pair which works
for Plenum and Non-Plenum cable.