Re: USB ports


"thoss" <usenet@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:a+Q4vsAs8PnEFwi9@xxxxxxxxxxxxxxxxx
On Fri, 23 Jun 2006 M.I.5¾ wrote:


"ric" <publicmail@xxxxxxxxxxxxxxxx> wrote in message
news:1151053537.445037.167780@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

thoss wrote:

On Mon, 19 Jun 2006 John of Aix wrote:

thoss wrote:
Does it matter which USB port a peripheral is plugged in to? My PC
has two rear and one front port, and my Voip phone works only in the
front port, which is the one I used when installing its driver.

Could I get it to work on a rear port by uninstalling and
reinstalling
while on a rear port?

Normally they should all work without a problem but in my experience
the
front port is often a USB1 port, or at least Windows thinks it is, and
the rear, USB 2. Apart from that there should be no difficulty. Have
you
checked your rear ports to be sure that they actually work (with some
other USB thingy)?


More on this problem, from Device Manager.

To recap, my VOIP phone works when plugged in to the front USB port but
not to any of the rear USB ports. I now find that when I plug it into
a
rear port it appears in Device Manager as a VOIP USB Phone under Other
Devices, but when I plug it into the front port it appears under USB
Controllers as a USB Composite Device.

By contrast, I have tried my USB scanner, and whether front or back
this
appears as a USB Flatbed Scanner under Imaging Devices.

Any suggestions as to what may be going on here will be gratefully
received.
--
Thoss

probably a buggy driver. nicely written ones will install the driver
once when device plugged in first USB port, then automatically install
the driver again if you plug it into a different usb port (actually a
different usb hub: often frnt and rear usb ports are actually hooked up
to separate usb controllers on the motherboard).
badly written ones don't. this is why some devices ask you to install
the drivers BEFORE the usb hardware as then it's got a greater chance
of working in all ports.

what i'd do is plug it in the front, go to device manager properties,
stick the driver cd in and click "update driver". point it at likely
looking folders on the cd if it doesn't pickup a device name
automatically. if this doesn't work, delete it from device manager
and try again.
if this still doesn't work, set windows to display unconnected device
drivers, and without phone connected delete it. reconnect and retry.


The MO of USB isn't quite that straightforward. Peripherals can be broken
into 2 types; serial numbered and non serial numbered. Dealing with the
latter first (as they are more common). On first plugging in, it will
install using a pre-loaded driver if one is present, otherwise it will ask
for a disk. Eventually, it should work. When plugged into a different
port, Windows assumes that it is a second peripheral and will install a
second device. The difficulty is that the dialogue box asking for the
driver either appears under another window or gets dismissed by the user
who
doesn't understand why it is reinstalling. The result is often an unknown
device associated with that port. Many devices will ask for the disk
again
if that is the way the first one was installed.

In the case of serial numbered devices, the serial number for the first
connection is logged in the registry. Plugging it into a different port
causes windows to look the serial number up, and when it finds it, it
simply
associates the original device with the new port and it works straight
away
(retaining any assigned drive letter if appropriate).

There is a gotcha at this point because a number of manufacturers have
misinterpreted the USB specification and have allocated a fixed serial
number to their entire production run. This prevents 2 devices being
connected at the same time (there is a workaround, but it's too
complicated
to explain here).


Thanks to you and Ric for your detailed responses. I've been through
all the things ric suggests without success. I think my next step will
be to go through the registry removing any reference to Trust and to
VOIP Phone, and then reinstall.

The first thing to do might be to remove any unknown devices (plug your
phone in to make them appear (or google for how to make non present devices
appear)).


.

Relevant Pages

  • Re: Is there a way to get USB ports to work
    ... don't know if it will work on a PCI USB card or if even the external ... sending power to any device connected to any USB port that requires ... When the ipod is connected it used to automatically invoke itunes. ... Can't do a system reformat and install because don't have the ...
    (alt.os.windows-xp)
  • Re: Scanning communication erro
    ... parallel port and so that probably worked fine because of that. ... that uninstalling the USB port and controller drivers will kill the keyboard ... Did you follow the installation instructions exactly--IE install the ...
    (microsoft.public.windowsxp.print_fax)
  • usb_insert_transfer panic with if_zyd
    ... When I use my ZyXEL G-220 Wireless USB Stick with the if_zyd driver, ... <ACPI PCI bus> on pcib0 ... device problem, disabling port 1 ... <Ethernet over FireWire> on firewire0 ...
    (freebsd-current)
  • 2.6.10-rc1 & ahci & IHC6R & 925X & raid1
    ... usb modules for console, usb keyboard, network and starting a shell. ... ACPI: PM-Timer IO Port: 0x808 ... PCI: PCI BIOS revision 2.10 entry at 0xfb768, ... usbcore: registered new driver hub ...
    (Linux-Kernel)
  • Re: Printing on HP 845C suddenly stopped
    ... The quickest and easiest way to resolve this is to purchase a PCI USB 2.0 ... port card..... ... Cari Windows Client - Printing & Imaging ... during the install not recognizing the printer on the USB port. ...
    (microsoft.public.windowsxp.print_fax)