This Patch Panel supports up to 16 Panasonic 2-wire analog station or C.O. Line circuits such as those used on the KX-TDA100/200, KX-TDA600 and KX-TD500. In addition, this panel has eight (8) extra analog circuits at the end for C.O. Lines or SLT circuits. This would be cards that use only the center pair of the jacks to communicate. Comes with two 10 ft. cables with Amphenol type male end. Custom lengths are available.