Echoplex meaning

Synonymous with echo checking.A primitive error control protocol in which the receiving station retransmits each received character back to the transmitting station. See also echo, echo checking, error control, full duplex, half duplex, protocol, and simplex.
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(computing, intransitive) To echo received text characters back to the computer that sent them.
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Origin of echoplex

Blend of echo and duplex?