but that describes data movement not the radio definition

Simplex
is where only one channel is in use. each party take their turn to TX & RX.


Semi-Duplex or Half-Duplex
is where two channels are in use, either party 'can' RX & TX at the sametime
(if enabled) but both cannot do it simultaneously.

not to be confused with
Split,
which is the same as simplex but on two channels.

Full Duplex
is same as above where it can be done simultaneously (like a telephone)

mike

"DougSlug" wrote in message
...
Here's a definition:
http://physinfo.ulb.ac.be/cit_course...omm/dc_014.htm


"tom" wrote in message
news:zxHUd.527095$8l.408835@pd7tw1no...
what's the difference between simplex and half-duplex?