Cat 3 Telephone Wire. Today cat3 cables are primarily used in commercial phone systems like PBX and VOIP where fast speeds are not needed but a large number of internal phones must be connected usually for business purposes. It is a less expensive choice than Cat 5 wiring which is appealing on a budget.
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Older telephone wiring was a basic Cat-3 4 conductor or 2-pairs with red green black yellow. CAT3 can be relied on to handle data speeds of up to 10 Mbps but no more. Most cable nowadays is UTP unshielded twisted pair.
Newer homes can have anything from Cat-3 3-pair on up to Cat-5e with 4-pairs with the insulation colors being a combination of solid and solid with white for each wiring pair.
It is a less expensive choice than Cat 5 wiring which is appealing on a budget. Telephone wiring for a phone outlet is typically either 1 2 or 3 pairs 2 4 or 6 conductor. Solid bare copper conductor maxima the cable length you can run and guaranteed better signal quality with low impedance cable. CAT3 can be relied on to handle data speeds of up to 10 Mbps but no more.
