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Old Jul 9, 2002, 7:42 PM   #1
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this forum is for the free discussion of technologies current and future that do and can have an effect on photography as a whole.

[Edited on 7-10-2002 by sjms]
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Old Jul 11, 2002, 9:11 AM   #2
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SJMS

Good job!

To follow up on the Firewire discussion... Wouldn't it be nice to hook up a camera to a HD or CD burner directly? It's definetly do-able with 1394 since some videocam already implemented this...

With the current USB, it's just impossible because of the current standard required to have the PC as the bus master. I hate to be chained to a laptop!

[Edited on 7-11-2002 by NHL]
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Old Jul 11, 2002, 9:34 AM   #3
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your right to a extent. the firewire spec is better at this point. it has also been around for a long time and at a commands a higher price/cost because. if it wasn't for a certain organization we wouldn't be having this discussion. firewire would be everywhere in the industry. and we would be doing the direct hook up. USB is much closer to being an "Open Source" spec and i believe has a greater chance of maturing faster. as far as being chained to the laptop you know that will probably change. but in this current economic enviornment R&D is not high on any orgs list right now. i have unfotunately grown highly cynical of the tech/business world.

i think the implementation of firewire may increase now because of USB 2.0 and beyond. Licensing is what held back firewire. now with usb starting to spool up and nip at its heels things may loosen up and get reasonable.

i looked into the patents produced by Apple. a lot of their concepts were brilliant. i unfortunately feel there management squandered their greatest assets.

[Edited on 7-11-2002 by sjms]

[Edited on 7-11-2002 by sjms]
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Old Jul 11, 2002, 9:46 AM   #4
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From page 17 of USB spec rev 2.0:
'USB 2.0 host controllers and hubs provide capabilities so that full-speed(12Mb/s) and low-speed(1.5Mb/s) data can be transmitted at high-speed(480Mb/s) between the host controller and the hub, but transmitted between the hub and the device at full-speed or low-speed. This capability minimizes the impact that full-speed and low-speed devices have upon the bandwidth available for high-speed devices...'

IE. if you are Tier 3 on the USB bus topology (not a hub) don't expect anything faster than 12Mb/s !!!

[Edited on 7-11-2002 by NHL]
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Old Jul 11, 2002, 10:26 AM   #5
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"1394 uses a "fairness" arbitration approach to assure that all devices that have information to transmit get a chance to use the bus."
how is it arbitrated?
what is it affected when a hi bandwidth and a lo BW try to xmt/rcv at the same time and you are BW limited by traffic?

i'd love to download the entire spec.

1394b- now that looks a bit more impressive.
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Old Jul 11, 2002, 10:28 AM   #6
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wow! from photo forum to an ieee seminar in click of a keyboard.
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Old Jul 11, 2002, 10:33 AM   #7
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Guideline of Transmission and Control... through IEEE1394 Bus.

... the power of the internet never stop to amaze me...

[Edited on 7-11-2002 by NHL]
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