It is the indicators that movement in both directions, but one way at the same time. In microcomputer communications, HDX or half-duplex describes service of the internet local match that causes the device to deliver a duplicate of given information towards the sending computer’s display.
Some modems contain a switch that lets you select between half-duplex and full-duplex modes. The correct choice depends on which program you are using to transmit data through the modem. In half-duplex mode, each character transmitted is immediately displayed on your screen. An example of a half-duplex device is a CB (citizens band) radio.
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This character name is alluding to Philo Farnsworth and Vladimir K. Zworykin, who invented the iconoscope. He was inducted into the Television Academy Hall of Fame in 2013