half-duplex circuit

half-duplex circuit

[′haf ¦dü‚pleks ‚sər·kət]
(communications)
A circuit designed for half-duplex operation. Abbreviated HDX.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In the case of a multipoint or half-duplex circuit, it may not be desirable to have multiple modems transmitting at the same time.