From owner-freebsd-chat@FreeBSD.ORG Sun Oct 12 15:42:53 2003 Return-Path: Delivered-To: freebsd-chat@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id AE72D16A4C0 for ; Sun, 12 Oct 2003 15:42:53 -0700 (PDT) Received: from vhost109.his.com (vhost109.his.com [216.194.225.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2FF9943FB1 for ; Sun, 12 Oct 2003 15:42:51 -0700 (PDT) (envelope-from brad.knowles@skynet.be) Received: from [10.0.1.2] (localhost.his.com [127.0.0.1]) by vhost109.his.com (8.12.6p3/8.12.3) with ESMTP id h9CMglC7061126; Sun, 12 Oct 2003 18:42:48 -0400 (EDT) (envelope-from brad.knowles@skynet.be) Mime-Version: 1.0 X-Sender: bs663385@pop.skynet.be Message-Id: In-Reply-To: References: <20031011212201.GA67228@bishop.my.domain> Date: Mon, 13 Oct 2003 00:42:36 +0200 To: naddy@mips.inka.de (Christian Weisgerber) From: Brad Knowles Content-Type: text/plain; charset="us-ascii" ; format="flowed" cc: freebsd-chat@freebsd.org Subject: Re: General Wireless Network Question X-BeenThere: freebsd-chat@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Non technical items related to the community List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 12 Oct 2003 22:42:53 -0000 At 9:57 PM +0000 2003/10/12, Christian Weisgerber wrote: >> I would say that VOIP over 802.11b could very easily be marginal at >> best. > > Oh c'mon, standard telephony voice is 64kbit/s. That's assuming you can get connected at 11Mbits/sec theoretical throughput, which you claim you can only get about ~550kbytes/s. If you can only manage to get connected at 2Mbits/sec or 1Mbit/sec (as happens when the signal strength drops), your practical throughput will be even lower. Moreover, your bandwidth estimate for VOIP doesn't take into account protocol overhead. In addition, this doesn't take into account how much of that shared bandwidth might be sucked down by other clients. VOIP can be done over 802.11b. Vocera has proven it. But you have to have a suitable LAN infrastructure to make that feasible. A single 802.11b access point may very well have difficulty meeting those requirements. -- Brad Knowles, "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, Historical Review of Pennsylvania. GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E-(---) W+++(--) N+ !w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++) tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++)