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:
“She was a phantom of delight
When first she gleamed upon my sight;
A lovely apparition, sent
To be a moment’s ornament;”
—William Wordsworth (1770–1850)
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