telephone carrier current

telephone carrier current

[′tel·ə‚fōn ′kar·ē·ər ‚kə·rənt]
(electricity)
A carrier current used for telephone communication over power lines or to obtain more than one channel on a single pair of wires.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.