Traditionally Ethernet networks use 8 conductor cable (or 4 twisted pair) of which four are left spare & not used. These adaptors make use of the spare conductors. In effect the fully wired economizers, to be used in pairs at each end of a cable run, allow Cat.5E data & voice signals to be divided. By plugging one economizer direct into a wall outlet & another into a patch panel at the other end; one cable run of 4 twisted pair can be used to transmit either 2 sets of data, voice or single data & voice signals.