This is because data can be sent in both directions at the same time in full duplex mode, but only in one direction at a time in half duplex mode.
22.
In the case of a reflective star, the bus connection from the RT will be a single fibre cable, over which the RT both transmits and receives ( half duplex ).
23.
AMD had some success in the mid-1980s with the AMD7910 and AMD7911 " World Chip " CCITT tones at up to 1200 baud half duplex or 300 / 300 full duplex.
24.
On an Ethernet connection, a "'duplex mismatch "'is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex.
25.
In the case of using a repeater hub, only a single transmission could take place at a time for all ports combined, so they would all share the bandwidth and run in half duplex.
26.
When a device is operating in full duplex while the other one operates in half duplex, the connection works at a very low speed if both devices attempt to send frames at the same time.
27.
While the Internet phones allow full-duplex communications ( in other words, two people can talk at the same time ), in reality, it ends up more like half duplex, an experience comparable to two-way radio communication.
28.
Depending on timing the half duplex device may sense a late collision, which it will interpret as a hard error rather than a normal consequence of CSMA / CD and will not attempt to resend the frame.
29.
However, this distinctionthat power is provided by the busis not the case in many duplex, allow all the connected LRI / LRUs to act, at different times ( half duplex ), as transmitters and receivers of data.
30.
However, if the other device is working in half duplex, it does not expect to receive data ( because it is currently sending ); therefore, it senses a collision and attempts to resend the frame it was sending.
