公开(公告)号：CA1130409A

公开(公告)日：1982-08-24

申请号：CA365432

申请日：1980-11-25

Applicant: IBM

Inventor： NOEL FRANCIS E JR ,  STILWELL GEORGE R JR ,  KOLODZEY JAMES S

IPC: H04L5/16 ,  H04L25/22

Abstract: HALF-DUPLEX/SIMPLEX DIGITAL SIGNAL CONVERTER A solid state circuit, which serves as a twin simplex/ half-duplex converter, includes a triple input NAND gate. The output of the NAND gate is connected directly to the outgoing simplex conductor. Signals on the incoming simplex conductor are applied to the three inputs of the NAND gate through separate signal paths which introduce different delays. One signal path introduces an intermediate delay before applying the incoming signal to the NAND gate in an inverted form. The half-duplex line is connected to this signal path. While incoming signals are applied at all three inputs to the NAND gate as well as to the half-duplex line, a lack of coincidence at the inputs prevents any incoming signal from passing through the converter to the outgoing simplex line. RA9-79-005