direct-current quadruplex system

direct-current quadruplex system

[də¦rekt ¦kə·rənt ′kwä·drə‚pleks ‚sis·təm]
(communications)
Direct-current telegraph system which affords simultaneous transmission of two messages in each direction over the same line, achieved by superimposing neutral telegraph upon polar telegraph.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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