Wrap Test for Half Duplex Modem
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-28
Disclosed is a wrap test for a half duplex modem which cannot send and receive data simultaneously, wherein analog data representing the original bit pattern from the modem is converted to digital data, the converted digital data representing the analog data is temporarily stored in a memory, the digital data is converted to analog data, and the analog data is fed back to the modem and compared with the original bit pattern. Referring to the figure, a microprocessing unit (MPU) 1 controls the operations of the circuits. In a normal data transmission mode, a switch (SW) 2 is switched to position A.