From owner-freebsd-current@FreeBSD.ORG Thu Sep 22 19:33:56 2005 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5EB0F16A41F for ; Thu, 22 Sep 2005 19:33:56 +0000 (GMT) (envelope-from jim@netgate.com) Received: from netgate.com (mail.netgate.com [64.62.194.115]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1C74E43D45 for ; Thu, 22 Sep 2005 19:33:55 +0000 (GMT) (envelope-from jim@netgate.com) Received: by netgate.com (Postfix, from userid 45) id ACD61280012; Thu, 22 Sep 2005 12:33:53 -0700 (PDT) Received: from [192.168.119.221] (unknown [4.30.94.83]) by netgate.com (Postfix) with ESMTP id 9E7BE280009; Thu, 22 Sep 2005 12:33:40 -0700 (PDT) Message-ID: <43330710.5030007@netgate.com> Date: Thu, 22 Sep 2005 09:33:36 -1000 From: Jim Thompson User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Daniel O'Connor References: <4332ECFF.4010507@ThePacific.Net> <6.2.3.4.2.20050921224804.02c9aeb0@cobalt.antimatter.net> <4332F44A.4090100@ThePacific.Net> <43324BBF.3080206@gsoft.com.au> In-Reply-To: <43324BBF.3080206@gsoft.com.au> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on he-colo.netgate.com X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=AWL,BAYES_00 autolearn=ham version=3.0.3 Cc: "Marcos Biscaysaqu - ThePacific.net" , current@freebsd.org Subject: Re: split Rx Tx with 2 interfaces?? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2005 19:33:56 -0000 Daniel O'Connor wrote: > Marcos Biscaysaqu - ThePacific.net wrote: > >> Glenn Dawson wrote: >> >>> At 10:42 AM 9/22/2005, Marcos Biscaysaqu - ThePacific.net wrote: >>> >>>> Hi there. >>>> Somebody knows if is possible split the rx and tx traffic in 2 >>>> differents interfaces, I want to do it with 2 wireless cards (one >>>> rx, one tx) , I cant make or I dont know how make it work yet..... >>>> >>>> any ideas?. >>> >>> >>> >>> >>> What do you hope to gain by doing that? >> > > You could buy a T/R switch :) > > Not sure if anyone sells off the shelf 2.4Ghz low power TR switches > though (wouldn't suprise me if they did, but I suspect they're expensive) 1) yes, its possible. 2) the real problem is you have to keep the TX side from transmitting while the RX side is receiving, or you blow the received packet. This is bad. This has been done (check my recent resume for 'where', and 'hint' its in the current product), but it requires a small amount of external logic, and a *very* fast non-maskable interrupt. (And thats all the hint I can give without my ex-employer getting pissed. Perhaps if they go out of business...) 3) you could drive the switch outputs on the tx side to ground except when you actually want to transmit, but you still have the problem in #2 to solve.