Lots of people think it's better to have a single cable that carries both power and 2-way data to a device, rather than one cable for power and a second, separate cable for data. Do we already have a tag for that -- perhaps "powerline"? Should we make up a new tag -- perhaps "bias-tee" or "power+data" or "cable-reduction" or something else?
How should we tag questions related to that single-cable ideal? I'm tempted to tag them all with the "powerline" tag, but the phrase "powerline communication" often refers to the very specific idea of running data through the same 2 wires in the walls of a house used for mains power ( https://electronics.stackexchange.com/questions/tagged/line-power ).
I want a more general tag I can apply to systems where 2 wires carry combined data+power, where the power is supplied as DC power, or at least the power is much lower voltage than mains power. Systems such as model trains ( DC power line communications ), laser modulation ( I need to design a Bias-T circuit for a diode laser - help choosing component values ), coax cables that simultaneously carry power up to a pre-amp on the roof and TV signals from the pre-amp down to the TV (mentioned in Injecting a communication signal over DC power supply lines ), etc. Perhaps a tag "bias-tee" would be adequate for those kinds of systems.
However, even "bias-tee" refers to the specific configuration of an inductor and a capacitor to combine and separate the power and data. I suppose we could stretch it a bit and also apply it to things like analog telephone circuits that substitute a gyrator for the inductor.
I want an even more general tag I can use on questions about systems that may use techniques other than bias-tee to run power and data through the same cable -- such as the center-tapped transformer, used in some kinds of power-over-ethernet; or bundling 2 power conductors well-insulated from the 2 or more data conductors in the same cable, used in other kinds of power-over-ethernet.
That more general tag would be useful on questions such as " Safe Powering Methods - Working with Children " -- where the original poster just wants to send power and data through the same cable, and is willing to consider all of the above ways of doing that.
How should we tag questions that deal with power and data through the same cable?