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Frequently Asked Questions

How can I use USB 2.0 device in Win98?

FAQ
Windows 98 default supports only USB 1.1. Install a USB 2.0 PCI adapter then USB 2.0 device still can work fine in Windows 98. Some device such as Micronet´s USB 2.0 adapter, it includes a USB 2.0 driver written by third party so it can work in Windows 98SE.

What do I need to use a USB 2.0 device?

USB Products
The requirement is similar to that of USB 1.1, but all components will have to be USB 2.0 compliant. A successful USB...

How do I use my USB device in the lab?

UT Physics Linux FAQ
Before inserting your USB memory stick, please log in to the machine directly (not via SSH from another system). Logging in at the console will ensure that the USB memory device is mounted with you as the owner. It is safest to insert the device into one of the USB ports on the front of the computer (rather than those on the back or on the keyboard).

What happen if a USB 2.0 device is plugged into a USB 1.1 system?

USB Products
The entire bus under the USB 1.1 root hub will slow to 12Mbps. The operating system will probably notify the user...

What can I do about the error message "Could not find USB device"?

Chapter 3. Frequently Asked Questions (FAQ)
The exact error message looks like Could not find USB device (vendor 0x0000, product 0x0000). Make sure this device is connected to the computer You have to set up the permissions on your USB device correctly. See Section 4.3, "Setting up permissions for USB ports".

I only have USB 1.1 sockets will a 2.0 device work with them?

Offtek.co.uk |
The USB 2.0 Flash Drive is fully backwards compatible with USB 1.1 sockets. However the device will only transfer data at the speed of the sockets.

Q19. Is it possible to disable my Fifo one my USB 2.0 serial device?

USB Serial Adapter FAQs by Quatech
Quatech has implemented a Low-Latency mode on all USB 2 devices. This setting can be found on the USB Serial Ports Advanced Options tab of the device manager. Each port can be set individually.

How do I determine whether my device runs at USB 2.0 speed?

Solaris Ready USB FAQ
On Solaris 8 and Solaris 9, check with prtconf -D whether the host controller is usba10_ehci, for example on Solaris 9: usb, instance #0 (driver name: usba10_ehci) On Solaris 10 and later, check /var/adm/messages for messages similar to: Dec 13 17:05:57 mysystem usba: [ID 912658 kern.info] USB 2.0 device You can use 'cfgadm' to find the port that your device is connected to. See the man page cfgadm_usb(1M) for details.

What is USB 2.0?

Computer Tips
USB 2.0 is a complete overhaul to the Universal Serial Bus input/output bus protocol which allows much higher speeds than the older USB 1.1 standard did. USB 1.1 allowed a maximum transfer rate of 12Mbits/second. That rate is now called 'USB.' Though some manufacturers label their products Full-Speed USB. Note that this seems a bit deceptive. Its easy to mistake Full-Speed for Hi-Speed. an aside, USB mice and keyboards need only 1.5Mbits/s to function.

Can you use USB 1.x devices on USB 2.0 controllers?

FAQS (Someting About Data Connections)
Yes but they will only work at USB 1.x speeds. The only time you will get the full 480Mbps speed out of a USB 2.0 controller is if you are using a true USB 2.0 device. Back To Questions

What is the difference between USB and USB 2.0?

FAQS (Someting About Data Connections)
USB has speeds of up to 12 Mbps where USB 2.0 can use speeds up to 480 Mbps, making it 40 times faster! Back To Questions

What is the maximum distance you can use with a USB device?

FAQS (Someting About Data Connections)
You can go 5 meters or around 16 feet from a computers USB port or from a powered USB hub to a USB device. Back To Questions

Which USB to Serial device can I use with Solaris ?

Solaris Ready USB FAQ
Solaris supports Digi InsideOut Networks' devices and recently, KeySpan and Prolific chipset based devices' support were also integrated to Solaris. Keyspan and Prolific USB serial drivers are available in Solaris Express dated 2/2006 and in Solaris 10 Update 2 and later. PL2303 chip based adapters and Keyspan USA-19HS adapter are available as part of Solaris 10 Update 2. Keyspan USA-49WLC adapter is supported in Solaris Express dated 3/2006 and will be available in Solaris 10 update 3.

Can I use the USB adapter that came with another device with a non-USB controller?

The Control Center FAQ
Not only will it not work, you may damage your device. In order for a device to work with USB it must be compatible and have appropriate drivers. Some early releases of the Freestyle Pro and Precision Pro were not USB compatible; if it did not come with an adapter you are out of luck.

Why do I get the error message "Could not claim the USB device"?

Chapter 3. Frequently Asked Questions (FAQ)
The exact message looks like *** Error ('Could not claim the USB device') *** Could not claim interface 0 (Operation not permitted). Make sure no other program or kernel module (e.g. dc2xx or stv680) is using the device and you have read/write access to the device. You have to make sure that no such kernel module is loaded and that you have set up the permissions on your USB device correctly, such that you have (non-root) write access to the camera device.

Why don't you use a USB 2.0 or Firewire interface?

FAQ <neuron> Neuronal Synthesizer - Hartmann-Music.com
Currently, USB 2.0 and Firewire are both too expensive and not extensively tested by our developers to be approved as safe for a real time live performance instrument. Furthermore, the number of available peripherals that fully support the bandwidth of these interface formats is still too small. However, we might make these formats available as a future option as soon as more testing has been conducted.

How fast is USB 2.0?

Computer Tips
USB 2.0 has a raw data rate at 480Mbps, and it is rated 40 times faster than its predecessor interface, USB 1.1, which tops at 12Mbps. Originally, USB 2.0 was intended to go only as fast as 240Mbps.
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