Date: Wed, 1 Mar 2000 07:36:39 +1300 From: Joe Abley <jabley@patho.gen.nz> To: Dennis <dennis@etinc.com> Cc: Eddie - EAZNet Internet Services <eddie@eaznet.com>, FreeBSD ISP Mailing List <freebsd-isp@FreeBSD.ORG> Subject: Re: ATM DS3 Message-ID: <20000301073637.A21432@patho.gen.nz> In-Reply-To: <200002291832.NAA29072@etinc.com>; from dennis@etinc.com on Tue, Feb 29, 2000 at 01:31:40PM -0500 References: <38BABA13.2CFAA57A@eaznet.com> <38BABA13.2CFAA57A@eaznet.com> <20000301042744.B24877@patho.gen.nz> <200002291832.NAA29072@etinc.com>
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On Tue, Feb 29, 2000 at 01:31:40PM -0500, Dennis wrote: > We have HSSI adapters, but you cant do ATM over HSSI because there is no > cell deliniation information available. HSSI is typically HDLC protocols > and ATM is not HDLC. I was referring to this kind of carry-on: http://www.ziplink.net/~lroberts/Cells-In-Frames.html However, I have no idea whether it's real or not. > The only way to use a HSSI for DS3 ATM is to use a convertor..typically the > convertor translates ATM to Frame Relay and you run frame relay over the > hssi. This, in fact, is what most providers do to provide frame relay DSL > services which have a native ATM backbone. Using something like FRF.5. However, the obvious alternative for this particular application is to run the FreeBSD box as a router (1 x HSSI and 1 x ATM, always assuming you _can_ get that ATM adapter). > >I take it those are US$. Cisco ATM port adapters seem hideously expensive. > >Just another good reason to avoid ATM, I suppose :) > > Yes, ATM sucks (plus you'll only get about 32M on a T3 usable bandwidth (vs > 41M on a cisco hdlc hssi or frame relay line), but the telcos want it so > you're stuck with it. Ah, the enlightened telcos down here are delivering wide-area services on ethernet. Mmm. Cheap routers. Good. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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