🚀 go-pugleaf

kony wrote:
> On Sun, 15 Jun 2008 11:44:15 +0100, "ded"
> <witheld@invalid.witheld> wrote:
> 
>> The wimp known as gazwad, being KM's arse licker contributed
>> "Gazwad" <nospam.spam.nospam@gmail.com> wrote in message 
>> news:wewjgz$pxo$t@servile-happiness-
>>>> I'll keep it brief,
>>> You may as well, you bullshit-spouting retard.
>>>
>>>> it is a type of "remembering" so that once a device
>>>> is connected, that device hogs that connection. The front panel USB
>>>> is a type of hub, so if you are going to connect differing devices at
>>>> differing times, then disconnect using the safely remove hardware
>>>> wizard that appears in system tray when a device is connected to
>>>> front panel or a hub. It doesn't remove drivers or anything else,
>>>> it just frees up the socket for next device to be connected.
>>> <Shakes head>
>>>
>> Is it too puzzling for you, you don't understand the difference between
>> the rear panel USB being a PCI card and the front panel being a basic
>> powered on board hub, you didn't know that?
> 
> 
> It's no excuse for "Gazwad's" reply, but most front panel
> USB is not a powered on board hub.  Most is just an
> extension cable from the motherboard pin headers.  An
> exception would be when that does to a multi-in-one modular
> device like a card reader that has more than one integral
> USB socket or more than one other device integrated that
> uses USB besides the card reader slots.

The ports come from the Southbridge, because the Southbridge
has a ton of them available, and no motherboard makers wastes
money adding chips which are not needed. The Southbridge handles
ports on the I/O area on the back of the computer, and sends signals
to the spare 2x5 headers on the motherboard surface (intended for
extension cables and PCI slot covers and for front panel USB ports).
In some cases, Southbridge USB ports are used to control onboard
Wifi devices or sound devices. There is generally no need for
a hub on the motherboard. The Southbridge does it all.

The best quality signals electrically, will be the signals
that travel through the motherboard PCB, and go to the
USB stacks on the back of the computer. If an external USB
device is having problems, use the connectors on the back
for best results.

To give an example of how the quality of the computer case,
fits into all of this, consider what Antec was doing with
their computer cases years ago. They shipped a front panel
assembly, which was only compatible with USB 1.1. The company
knew exactly what they were doing, which was screwing their
users. You could connect a USB2 capable motherboard to the
Antec case, and the ports would only work in USB 1.1 mode. If
you complained to Antec, they would send out a new USB2
compatible module, to fit into the front panel. That is
an example, of how the properties of the cable and
front panel module, can affect how a front connected USB
device works (or doesn't work).

USB2 is a high speed interconnect, with requirements on
cable impedance and shielding. This is an example of a tool
that engineers use, to verify proper USB2 operation. A home
builder cannot afford to do this kind of testing, so there
is no way to know how well a front mounted USB port is working.
In the figure here, the blue lines are an "eye diagram", and the
red portions are the "template". To pass, the blue part, cannot
touch the red part. The red part is the "specification" and
the blue part is collected from thousands of measurements of
logic 1's and 0's on the USB connector (the device making the
measurement and display, is a digital storage oscilloscope).
A similar technique is used to verify that DVI works on your
video card.

http://www.testequity.com/productprint/1181/

    Paul