USB Cable PinOuts and Technical Information
Finding Additional Infomation on an Unknown Device Drivers.USB Devices can easily be identified by their Vendor ID and Products Id and then Looked up online at :
Step 1. Down Load USBView.com from Microsofts Website.
Step 2. Run USBView look for the New Device.
Step 3. Write down the Vendor ID and Product ID.
Step 4. Go to PCIDATABASE .
USB Cable PinOut Diagrams.
USB 1.1 and 2.0 Technical Information.
The Universal Serial Bus has the following features:The devices connected to a USB port rely on the USB cable to carry power and data.
Inside a USB cable: There are two wires for power -- +5 volts (red) and ground (brown) -- and a twisted pair (yellow and blue) of wires to carry the data. The cable is also shielded.
When the host powers up, it queries all of the devices connected to the bus and assigns each one an address. This process is called enumeration -- devices are also enumerated when they connect to the bus. The host also finds out from each device what type of data transfer it wishes to perform:
The host can also send commands or query parameters with control packets.
As devices are enumerated, the host is keeping track of the total bandwidth that all of the isochronous and interrupt devices are requesting. They can consume up to 90 percent of the 480 Mbps of bandwidth that is available. After 90 percent is used up, the host denies access to any other isochronous or interrupt devices. Control packets and packets for bulk transfers use any bandwidth left over (at least 10 percent).
The Universal Serial Bus divides the available bandwidth into frames, and the host controls the frames. Frames contain 1,500 bytes, and a new frame starts every millisecond. During a frame, isochronous and interrupt devices get a slot so they are guaranteed the bandwidth they need. Bulk and control transfers use whatever space is left.