In 1919, Transradio was the first company to introduce duplex transmission.
2.
The air interface operates as a half duplex transmissions.
3.
NMT used full duplex transmission, allowing for simultaneous receiving and transmission of voice.
4.
A year later, in 1919, Transradio made history by introducing duplex transmission.
5.
Originally, port numbers were used by the Network Control Program ( NCP ) in the ARPANET for which two ports were required for half-duplex transmission.
6.
Etherloop uses half-duplex transmission, and as such, is less susceptible to interference caused by poor line quality, bridge taps, etc . Also, etherloop modems can train up through line filters ( although it is not recommended to do this ).
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