Date: Tue, 29 Dec 1998 09:38:27 +1300 From: "Shane Cole" <shane.cole@staff.paradise.net.nz> To: "Javier Henderson" <javier@kjsl.com>, "Dennis" <dennis@etinc.com> Cc: "Alan Batie" <batie@rdrop.com>, <isp@FreeBSD.ORG> Subject: Re: ATM WAN interface Message-ID: <016501be32a2$0e8a7bc0$019b60cb@paradise.net.nz>
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We recently changed from using a 1920kbit E1 W-DDS circuit to a 1920kbit service that is delivered to us over 'ATM' (it still arrives on a V.35 connection to a Serial on my router..., I have noticed a drop in my mrtg graphs of bandwidth utilisation at peak times of around 50kbits. Of course the point of going to ATM is to use a OC-3 interface and be able to scale well past 2Megs which we can't do until the Single Mode card arrives... Regards Shane ----- Original Message ----- From: Javier Henderson <javier@kjsl.com> To: Dennis <dennis@etinc.com> Cc: Alan Batie <batie@rdrop.com>; <isp@FreeBSD.ORG> Sent: Tuesday, December 29, 1998 8:55 AM Subject: Re: ATM WAN interface Dennis writes: > Note that ATM has a LOT of overhead (like 30%). so ATM over a DS3 > is not nearly the bandwidth of using straight HSSI or PTP. ATM is meant > as a medium that can be switched at high speed, but as a PTP mechanism > it is very poor. I've often wondered how well IP would do, throughput-wise, over ATM with its 53 byte cells. "Packet fragmentation overhead" comes to mind. I've never seen actual performance figures, however. -jav To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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