Re: weird USB - Firewire bridge

2010-06-14 Thread Manuel Marques
Thank you all for your replies! I'll give the adapter a shot when I
find time to do so :).

Regards,
MM

On Jun 14, 12:09 am, Dennis Myhand dmyh...@suddenlink.net wrote:
 No.  It will run at the slower USB 2.0 speed.  Whenever you are working
 with devices that work at different speeds your bottleneck will always
 be the slower device.  Peace, Dennis



 Mark Sokolovsky wrote:
  Here's a good question. If i have a USB 2.0 external HDD and plug in the
  FW adapter, will it run at full firewire speed?

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Re: weird USB - Firewire bridge

2010-06-13 Thread Mark Sokolovsky
It might stop working after a  while, but it won't blow up. This is what
usually happens to really cheap computer stuff.
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Re: weird USB - Firewire bridge

2010-06-13 Thread Dan

At 9:06 AM -0700 6/13/2010, Manuel Marques wrote:
cheap set of USB adapters, and was surprised to find one that has a 
USB female plug in one end and a standard FireWire 400 port in the 
other.


These are a PITA necessity now that Apple has dropped FW from some machines.


The adapter is so small that I really can't imagine what kind of
electronics is hidden there! I always thought Firewire required a
special controller, and that's why Firewire devices were more
expensive than their USB counterparts.


A real firewire controller does the i/o work for the CPU.  The 
protocol's low overhead, plus the work done in the controller, are 
the reason for FW's blazing throughput.  USB is designed to be a 
cheap dumb interface - making the main CPU do most of the work.  The 
adapter converts the signals but does no processing.  That's up to 
your USB driver and the machine's main CPU to do.



I can post links to some images of the adapter, but I wanted to know
your opinion prior to plugging something to it. Will it blow up? :)


It should be fine.  Just don't expect full firewire performance from it.

And I believe the Adapter counts as a device, so it pulls a unit 
of power.  This can be problematic with some peripherals that want to 
leech power from the bus -- USB has much less power available than 
FW.  If this is a problem, you'll get a dialog complaining.  If it's 
a serious / electrical problem, OS X will shut off the interface 
(reboot to restore it).  A powered hub will usually fix things.


HTH,
- Dan.
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- Psychoceramic Emeritus; South Jersey, USA, Earth.

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RE: weird USB - Firewire bridge

2010-06-13 Thread John Ruschmeyer
I one got something similar in a set of USB adapters. In my case, the kit
came with a retractable USB A male-to-A female adapter (extension cable) and
a set of various adapters to convert the extension cable into a dedicated
purpose cable; this included a pair of RJ-45 ends to turn the cable into an
Ethernet cable.

I think there was supposed to be a complementary adapter to the one your
father has in order to allow a USB extension cable to be used as a 4-pin
FW400 cable. (Ironically, I think you have the mate to the one I used to
have- USB female-to-mini FW400.

John

-Original Message-
From: g3-5-list@googlegroups.com [mailto:g3-5-l...@googlegroups.com] On
Behalf Of Manuel Marques
Sent: Sunday, June 13, 2010 12:07 PM
To: G-Group
Subject: weird USB - Firewire bridge

Hello all,

I know this is not the right place for this question, but no other LEM
list is, as well, so here it goes: my father bought a cheap set of USB
adapters, and was surprised to find one that has a USB female plug in
one end and a standard FireWire 400 port in the other.


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Re: weird USB - Firewire bridge

2010-06-13 Thread Mark Sokolovsky
Here's a good question. If i have a USB 2.0 external HDD and plug in the FW
adapter, will it run at full firewire speed?

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Re: weird USB - Firewire bridge

2010-06-13 Thread Dennis Myhand
No.  It will run at the slower USB 2.0 speed.  Whenever you are working 
with devices that work at different speeds your bottleneck will always 
be the slower device.  Peace, Dennis


Mark Sokolovsky wrote:
Here's a good question. If i have a USB 2.0 external HDD and plug in the 
FW adapter, will it run at full firewire speed?


--
 Sent from my Power mac G4 Sawtooth.

--
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Power Macs.
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