closed-circuit telegraph system

closed-circuit telegraph system

[¦klōzd ¦sər·kət ′tel·ə‚graf ‚sis·təm]
(communications)
Telegraph system in which, when no station is transmitting, the circuit is closed and current flows through the circuit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.