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[filmscanners] Re: SCSI to Firewire & SS4000
"Hemingway, David J" wrote:
>
> I was referring to specific scan times on the SS4000Plus using USB or
> firewire, not the throughput capabilities of the USB vs. SCSI vs. firewire.
> Scanners in general don't use a fraction of the bandwidth of firewire and
Roger that, this is indeed very plausible. I use the LS-4000ED with
Firewire and since the scanner produces (say) max. 150Mbyte in 3-4
minutes, it probably uses only a fraction of the FireWire bandwidth.
4 min is 240 sec, so actually strictly speaking even the USB-1 with
1.5 Mbyte/s could have enough throughput for the LS4000, assuming
a contiguous stream of data.
Thomas.
> SCSI.
> David
>
> -----Original Message-----
> From: ThomasH [mailto:herthh@attbi.com]
> Sent: Friday, March 22, 2002 1:19 AM
> To: hemingd@polaroid.com
> Subject: [filmscanners] Re: SCSI to Firewire & SS4000
>
> "Hemingway, David J" wrote:
> >
> > USB is about 50% slower than Firewire. Are you trying to run this on a
> > laptop? Or desktop? OS?
>
> I am very surprised about this estimate.
>
> Isn't that rather so that Firewire is by _magnitudes_ faster?
>
> Firewire is as fast as SCSI-2 UW! IEEE-1394 can pass up to
> 400Mbits/s, with plans for up to 1.2 gigabits(!!) per second
> for Firewire II. USB passes just 12Mbits/s, what makes USB
> up to whopping
> 33 times slower
> and not just 50% slower. Here is a nice overview of how the speed
> of the contemporary hardware interfaces look like:
>
> USB: 12Mbits/s (1.5MBYTES/s)
> ECP/EPP parallel port: 3MBYTES/s
> IDE: 3.3-16.7MBYTES/s
> SCSI-1: 5MBYTES/s
> SCSI-2 (Fast SCSI, Fast Narrow SCSI): 10MBYTES/s
> Fast Wide SCSI (Wide SCSI): 20MBYTES/s
> Ultra SCSI (SCSI-3, Fast-20, Ultra Narrow): 20MBYTES/s
> UltraIDE: 33MBYTES/s
> Wide Ultra SCSI (Fast Wide 20): 40MBYTES/s
> Ultra2 SCSI: 40MBYTES/s
> IEEE-1394: 100-400Mbits/s (12.5--50MBYTES/s)
> USB-2: 480Mbits/s (60MBYTES/s)
> Wide Ultra2 SCSI: 80MBYTES/s
> Ultra3 SCSI: 80MBYTES/s
> Wide Ultra3 SCSI: 160MBYTES/s
> FC-AL Fiber Channel: 100-400MBYTES/s
>
> Thomas.
>
> > David
> >
> > -----Original Message-----
> > From: David Gordon [mailto:mail@davidgordon.co.uk]
> > Sent: Thursday, March 21, 2002 11:51 AM
> > To: hemingd@polaroid.com
> > Subject: [filmscanners] Re: SCSI to Firewire & SS4000
> >
> > Hemingway, David JHEMINGD@polaroid.com wrote on 21.03.02 at 11:14 -0500
> >
> > >the most success was with either Adaptec or Orange Micro
> > >adapters. I do remember Microtech adapters did NOT work.
> >
> > Do you mean the Adaptec USBXchange - or do they make a Firewire version?
> >
> > According to the Orange Micro site the adapter is discontinued. My only
> > option is the Belkin Firewire or the Adaptec USBXchange.
> >
> > What kind of slowdown will I see using the USB?
> >
> > --
> > David Gordon
> >
> >
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