Date: Mon, 6 Sep 2004 09:13:10 -0700 (PDT) From: Richard Hodges <rh@matriplex.com> To: Harti Brandt <harti@freebsd.org> Cc: freebsd-atm@freebsd.org Subject: RE: Question on ATM w/ FreeBSD Message-ID: <20040906085243.A31206@mail.cheapline.net> In-Reply-To: <20040906090324.A16723@beagle.kn.op.dlr.de> References: <LOBBIFDAGNMAMLGJJCKNIEDNEPAA.tedm@toybox.placo.com> <20040906090324.A16723@beagle.kn.op.dlr.de>
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On Mon, 6 Sep 2004, Harti Brandt wrote: > On Sat, 4 Sep 2004, Ted Mittelstaedt wrote: > > TM>> If your card does not support VPI 1, you need a small ATM switch to move > TM>> ATM PVCs from one VPI to another. Fore ASX-200BX is excellent small and > TM>> cheap switch. > TM>> > TM> > TM>Are any of the cards mentioned - Fore LE155, PCA-200, HE155, not support > TM>VCI 1? > ^^^ VPI probably? > > The HE155 has a configurable VPI/VCI space of 12 bits that you can split > between VPI and VCI. Per default the driver uses 2 VPI bits and 10 VCI bits. > > The PCA-200 definitely can do only VPI 0. > > For the LE155 I don't remember. The LE155 can split the bits 0+12, 1+11, or 2+10, but the driver defaults to 0+12 (VPI=0, VCI=0-4095). Since there will be an ATM switch anyway for the DS3-OC3, this should not be an issue. Incidentally, the LE155 does not have a limit on the VPI/VCI combinations for the transmit side, just the SAR on the receive. So if RX traffic is light and/or you don't mind spending CPU cycles doing SAR in software, you could make a driver that had no VPI/VCI limits. At one time, I was thinking about doing this for an ATM/DSL access router. > TM>The Lucent PSAX gear I've seen on the secondary market, some of it is > TM>going for under $100. Compared to a used Fore ASX200BX at $800+, to me that > TM>is worth screwing with it - that is, if anyone can possibly confirm that > TM>the PSAX even is an ATM switch. I would definitely recommend the Fore switch over the SA100 (PSAX100). The modules and spares will be a lot easier to find for the Fore. Unless you really want the dual power supplies of the ASX-200BX, you can get the same switch cheaper by putting the SCP-ASXHA CPU board in the ASX-200WG. In a setting with no SVCs, I don't see any need to upgrade the CPU though. For that matter, the older and larger ASX-200 switches would be just fine, and you can probably buy them all day long for under $100 on ebay. Just be sure to get a spare, as the hard drive won't last forever. (It's a 2.5" SCSI, and a bit hard to find. Old Mac powerbooks are one source.) All the best, -Richard
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