wrote: >> Saying that is half duplex, doesn't work for me. In their example of >> "half duplex", (using push to talk), it still means that everybody on >> that channel hears who is talking. "half duplex" to me, given the >> definition of duplex, means more that there is a *p2p* channel (a wire), >> that you can ping pong data across. > Well, as Mikael stated as well, half duplex has been used on shared > medium in the ethernet world since it's inception. As you state it > does not match 100% with the wikipedia definition, but the tradition is > there. The ethernet interface on the device is half-duplex, because it can only do tx or rx to/from the coax cable. There is in essence a half-duplex connection there. (And with thickernet, there was actually a p2p AUI cable...) But, the coax cable is *not* half-duplex, because it has more than two senders to multiplex, so it can't be "half" duplex. And it's the coax that we actually want to similate, not the AUI cable. > Given your distaste for the term half duplex, and the coming advances > in .11ax which further confuses the issue, there may be a real need for > a better term. How about starting with a description of the > transmission properties and making a set of terms? Shared medium, > single sender, multiple recivers. (current mu-mimo wifi). Shared > medium multiple sender, multiple receivers. (OFDMA 802.11ax if they get > it working). Shared medium entails coordinated action. > Sender/receiver description also encapsulates that there is different > behavior in the different direction in the air. semi-multiplex -- Michael Richardson , Sandelman Software Works -= IPv6 IoT consulting =-