Twister pair phone wires come to the AT&T Telephone Network Interface Device (NID) outside your house
In the NID box is a balun that converts twister pair to a RG6 coaxial cable
The RG6 coaxial cable from the balun connects to the VDSL input of a Holland Electronics DPLS-2AR Diplexer
A RG6 coaxial cable is run from the “Combined’ output of the diplexer to the coaxial input on your AT&T 2Wire 3800HGV-B VDSL Residential Gateway (RG) modem / router
A RG6 coaxial cable is run from the “HPNA/TVRF” output of the diplexer to the input of a Holland Electronics GHPNA splitter
A RG6 coaxial cable is run from each of the outputs of the splitter to your AT&T set top boxes (STB)