Reliable Full-Duplex file Transmission over Half-Duplex Telephone Lines A field-proven scheme for achieving reliable duplex transmission over a half-duplex communication line is presented, and to demonstrate the difficulty of the problem, another similar scheme, which is only slightly unreliable, is also presented. A flowchart for the reliable scheme and some interesting examples are given. CACM June, 1968 Lynch, W. C. telephone communication, half duplex, transmission, error correction, full duplex, telephone errors 3.81 4.41 6.35 CA680602 JB February 22, 1978 4:45 PM 1743 5 1743 1743 5 1743 1743 5 1743 1907 5 1743 1743 6 1743