From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from tuna.sandelman.ca (tuna.sandelman.ca [IPv6:2607:f0b0:f:3:216:3eff:fe7c:d1f3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 9D1383B2A4 for ; Tue, 10 Oct 2017 09:21:20 -0400 (EDT) Received: from sandelman.ca (obiwan.sandelman.ca [IPv6:2607:f0b0:f:2::247]) by tuna.sandelman.ca (Postfix) with ESMTP id 5ED98203CB; Tue, 10 Oct 2017 09:27:05 -0400 (EDT) Received: from obiwan.sandelman.ca (localhost [IPv6:::1]) by sandelman.ca (Postfix) with ESMTP id EE2E381103; Tue, 10 Oct 2017 09:21:19 -0400 (EDT) From: Michael Richardson To: erik.taraldsen@telenor.com cc: dave@taht.net, bloat@lists.bufferbloat.net In-Reply-To: <1507624730253.7735@telenor.com> References: <1507534912438.44276@telenor.com>, <87376s6z5z.fsf@nemesis.taht.net> <1507624730253.7735@telenor.com> X-Mailer: MH-E 8.6; nmh 1.6+dev; GNU Emacs 24.5.1 X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m X-Mailman-Approved-At: Sun, 15 Oct 2017 22:44:04 -0400 Subject: Re: [Bloat] emulating non-duplex media in linux qdiscs X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Oct 2017 13:21:20 -0000 --=-=-= Content-Type: text/plain 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 =- --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEbsyLEzg/qUTA43uogItw+93Q3WUFAlncyU8ACgkQgItw+93Q 3WVlBwf/WKRdEzpx7Hs8syMaWhjmdNXmFOjn+e3j2noHZdbBvf0nxKxdHlhak+y4 DgU1o+8febgJzywx7bPETmdGcmg4WyCGefmhNH6rbVCEf/ug9HxuvpOzuy6IJ5dk a4c/DtN7roL++OlMt9c6/lCxnPCRUGHQ3CpemLfgSLMGFsuhqtmbhIr2KBLlhf+5 ukx2DkoYKGLDF1sN8m+qy6dTtjuCrxpRpUebDMDqVTI6F0XeKGuchR6qerXRMPEO yLpCcEexZv79Ud9JIIr+3XUnUqysc2AJ3juTY4e7diMF+tKWa3ZCLZ8Xkpou8urd hwVARWDraoBL1GSB+dGNiB//rdIxsQ== =qWSJ -----END PGP SIGNATURE----- --=-=-=--