From owner-freebsd-isp  Tue Feb 29 10:37: 1 2000
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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
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In-Reply-To: <200002291832.NAA29072@etinc.com>; from dennis@etinc.com on Tue, Feb 29, 2000 at 01:31:40PM -0500
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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.


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