Date: Tue, 15 May 2001 18:11:52 -0700 (PDT) From: Jin Guojun (DSD staff) <jin@george.lbl.gov> To: rh@matriplex.com Cc: atm@FreeBSD.ORG Subject: Re: Marconi ForeRunner HE 155 and HE622 Message-ID: <200105160111.f4G1Bq614194@portnoy.lbl.gov>
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> > Since GigE, specially the copper GigE out there, I do not think > > ATM will survive. So, give up. [snip] > > Thanks for the advice. I did not know that GigE has quality of > service support. It is good to hear that it will also handle > comitted bit rate virtual circuits across multiple switches, too. > Of course, the GigE point-to-multipoint capability will come > in handy as well. I am also glad to hear that all the ADSL vendors > have just redesigned all their equipment for GigE. A few years ago, the ATM seems the best one to build a WAN backbone. But the VC is painful and the overhead is high 5/48 ==> 10%. The ATM will continue to server the middle bandwidth network, especially in the DSL and LAN area because it has existing mechanism to pace and divide the bandwidth. But it may not be good for high-speed backbone any more due to its high overhead. Think if we put TV stations on network, put video rental stores on Internet, add visual telephone too, and we need a reliable service on the Internet. Not just ATM QoS cannot provide enough control, IPv6 does not either. It will probably need bandwidth allocation mechanism in network layer, and put the network layer directly onto the WDM to get better performance. Well, this is a long run decision which is I am working on. So, I have to download some other burden, such as ATM that may not be used in WAN. -Jin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-atm" in the body of the message
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