Date: Thu, 5 Apr 2001 09:43:03 -0700 (PDT) From: Richard Hodges <rh@matriplex.com> To: Harti Brandt <brandt@fokus.gmd.de> Cc: Alex Huppenthal <alex@aspenworks.com>, freebsd-atm@FreeBSD.ORG Subject: Re: ATM 4.3 and so on Message-ID: <Pine.BSF.4.10.10104050937080.45890-100000@mail.matriplex.com> In-Reply-To: <Pine.BSF.4.33.0104050808410.6149-100000@beagle.fokus.gmd.de>
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On Thu, 5 Apr 2001, Harti Brandt wrote:
> On Wed, 4 Apr 2001, Richard Hodges wrote:
>
> RH>The third would be suitable for filling a DS3 (96000 cells/s), and the
> RH>fourth could carry 10 mb/s of user data. Keep in mind that this is per
> RH>VC, so if you have many going at once, you may still exceed your cell
> RH>rate. I believe that the Fore card expects this rate info in network
> RH>byte order, but if not, just remove the "htonl()" from the macro. There
> RH>are many more possible values; let me know if you want the rest.
> RH>
> RH>And I haven't tested this myself, so if you give it a try, please let
> RH>us all know how it works :-)
> For what I know, this works only for a single VC. As soon as you try to
> shape more than one VC, things go wrong. Three years ago a Fore engineer
> told me, that they are going tu support shaping of up to 32 VC's 'in the
> Windows driver'... :-(
Well, that ^h^h^h^h^h is not good. From the rate control values, it
did look like some kind of burst/skip system. Both values add up to
255. Could it be that the rate is actually the entire interface rate
while that PDU is sent? That would make it complicated to handle
multiple VCs, but not impossible. Unfortunately, the cell spacing
would probably still be a problem.
Yuck.
I think I will stick with the ForeLE (IDT) cards.
All the best,
-Richard
-------------------------------------------
Richard Hodges | Matriplex, inc.
Product Manager | 769 Basque Way
rh@matriplex.com | Carson City, NV 89706
775-886-6477 | www.matriplex.com
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