[filmscanners] RE: SCSI to Firewire & SS4000

["Hemingway, David J" <HEMINGD@polaroid.com>]

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
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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