From owner-freebsd-chat Sat Aug 19 17: 0:46 2000 Delivered-To: freebsd-chat@freebsd.org Received: from server1.huntsvilleal.com (server1.huntsvilleal.com [63.147.8.7]) by hub.freebsd.org (Postfix) with ESMTP id 80DDD37B42C for ; Sat, 19 Aug 2000 17:00:44 -0700 (PDT) Received: from Spaz.HuntsvilleAL.COM (spaz.huntsvilleal.com [63.147.8.31]) by server1.huntsvilleal.com (8.9.3/8.9.3) with ESMTP id SAA24166; Sat, 19 Aug 2000 18:32:46 -0400 Received: from localhost (kris@localhost) by Spaz.HuntsvilleAL.COM (8.9.3/8.9.3) with ESMTP id AAA74002; Sun, 20 Aug 2000 00:00:08 GMT (envelope-from kris@catonic.net) Date: Sun, 20 Aug 2000 00:00:08 +0000 (GMT) From: Kris Kirby X-Sender: kris@spaz.huntsvilleal.com To: Ryan Thompson Cc: freebsd-chat@FreeBSD.ORG Subject: Re: Link speed on an SDSL provisioned T1 In-Reply-To: Message-ID: X-Tech-Support-Email: bofh@catonic.net MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Ryan wrote: > OK, this a little far from the theoretical maximum of 1572 Kb/sec. > (which I never expect to reach ;-) However, as I mentioned above, this is > link speed over _TCP_. Figure in the TCP protocol overhead, as well as > overhead introduced by frame headers, and the recommended number is about > 12% overhead. (Or 88% of the physical link speed). Thus, 1572 Kb/sec > looks more like 1367 Kb/sec for a maximum. I've personally seen 168KB/s (1344 Kb/s) and a co-worker of mine has seen 171KB/s (1368 KB/s). I've also had Netscape tell me I was downloading StarOffice at 133KB/s, 55KB/s, and 55KB/s (simulaneous). I wonder why I don't believe it? > I found that the street distance over our flat city between my ISP and our > office is about 5,900ft (1,800m). I had thought that this would be well > within range for a full 1.5Mbps. I suppose it is possible that the wire > distance is much greater than this, but I have no way to confirm or deny > that. I believe our telco likes bridged taps. ;-) My telco cut my line when they were pulling new cable. Efficient, no? > In any case, how cheated should I feel about only attaining 1Mbps as > opposed to 1.5? Well, if you're paying for a T1, you should be getting a T1. Anything less is unacceptable. > So, besides moving next door to the ISP and stringing UTP through the > windows, is there anything that can be done to break out of this 1.04Mbps > limit? Wireless (Optical, Microwave, etc). You might be able to do it for less than wire. The costs get a little more significant when you involve amplifiers. ($200 radio, $900 amp.) ----- Kris Kirby, KE4AHR | TGIFreeBSD... 'Nuff said. | ------------------------------------------------------- "Fate, it seems, is not without a sense of irony." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message