Date: Sun, 20 Aug 2000 00:00:08 +0000 (GMT) From: Kris Kirby <kris@catonic.net> To: Ryan Thompson <ryan@sasknow.com> Cc: freebsd-chat@FreeBSD.ORG Subject: Re: Link speed on an SDSL provisioned T1 Message-ID: <Pine.BSF.4.21.0008192349230.73778-100000@spaz.huntsvilleal.com> In-Reply-To: <Pine.BSF.4.21.0008191659420.59530-100000@ren.sasknow.com>
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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. <kris@nospam.catonic.net> | ------------------------------------------------------- "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
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