DC Phantom
Simple DC signalling can be achieved on a telecommunications line in a similar way to phantom powering of microphones. A switch connected to the transformer centre-tap at one end of the line can operate a similarly connected relay at the other end. The return path is through the ground connection. This arrangement can be used for remotely controlling equipment.
Read more about this topic: Phantom Circuit
Famous quotes containing the word phantom:
“If only the phantom would stop reappearing!
Business, if you wanted to know, was punk at the opera.
The heroine no longer appeared in Faust.
The crowds strolled sadly away.”
—John Ashbery (b. 1927)
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