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Date: Thu, 23 Jan 1997 11:47:51 -0600
From: david_levin@xircom.com
Subject: Re: 100Base-T PCMCIA ?
Newsgroups: comp.unix.bsd.freebsd.misc
Message-ID: <854040205.9997@dejanews.com>
Organization: Deja News Usenet Posting Service
References: <32DAA92B.3F54@browncow.com> <5bkmbg$duv@flea.best.net> <32E0F719.41C67EA6@net-tel.co.uk>
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:34463
In article <32E0F719.41C67EA6@net-tel.co.uk>,
Andrew Gordon <andrew.gordon@net-tel.co.uk> wrote:
>
> Matt Dillon wrote:
> >
> > :In article <32DAA92B.3F54@browncow.com>, Bill Kish <kish@browncow.com> wrote:
> > :>Does anyone have any information concerning 100Base-T PCMCIA cards
> > :>that might be suppported? If not how about cards that have specs
> >
> > I have always thought that PCMCIA used ISA-like bus timing and
> > frequencies, which would make PCMCIA's maximum bandwidth somewhere
> > around 5 MBytes/sec. This would appear to preclude being able
> > to get good performance out of a 100Base-T PCMCIA ethernet card.
> > (verses a PCI 100BaseT card, where PCI has 130MBytes/sec of
> > available bandwiddh).
>
> Traditional PCMCIA is ISA-limited, but many modern machines
> have CardBus PCMCIA slots. CardBus is (roughly speaking)
> PCI run over with a steamroller to make it fit in a PCMCIA size.
>
> However, I have yet to see any 100baseTX cards (nor many CardBus
> cards for that matter - CardBus is mainly prominent in the
> adverts for portables rather than for devices to plug in).
A little bit of understand. Yes PCMCIA (PC-Card) is based on ISA bus. Notebook make moved the controller onto the PCI bus. Xircom makes a 100MB pcmcia creditcard ethernet adapter. The pcmcia controler is a 16-bit interface. Carbus is a new 32-bit interface. These controllers are also on the PCI bus. Xircoms also make a Cardbus 100mb adapter. The difference is throughput. No one get 100mb thoughput, they just use 100mb signals. The pcmcia adapter gets around 30mb throughput. The cardbus adapter g
ets 40-60mb throughtput depending on the enviroment. 40-60mb throughput is also what you get when you use a PCI network card in your desktop mahcines.
David Levin
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