USB was originally created byIntelAndMicrosoftAdvocacy and initiation, the biggest feature of which is supportHot plugAnd Plug and Play.When the device is inserted, the host detects the device and loads the required driver, so it is much easier to use than PCI and ISA buses.
USB specification was first proposed in 1995 by USBIF (USB Implementation Forum), which is composed of Intel, IBM, Compaq, Microsoft, NEC, Digital, North Telecom and other seven companies. USBIF was formally proposed in January 1996USB1.0Specification, bandwidth is 1.5Mbps. However, there were few peripheral devices supporting USB at that time, somother boardBusinessmen do not design USB ports directly on the motherboard.
The popularity and demand of USB external devices.In September 1998, USBIF proposed the USB1.1 specification to revise USB1.0, which mainly revised the technical details, with a bandwidth of 12Mbps.USB1.1 is downward compatible with USB1.0, so for ordinary users, they cannot feel the difference between USB1.1 and USB1.0.
USB1.1
The maximum transmission rate of USB1.1 is 12Mbps, that is, "Full Speed USB" in the current USB2.0 standard. Some manufacturers label their products as "USB2.0 Full Speed".Be careful not to mistake "Full Speed" for "High Speed". The maximum transmission rate of the real USB2.0 High Speed is 480Mbps.
Upgrade method
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Most of the old computers are equipped with USB 1.1 interfaces.In order to achieve higher speed, it is necessary to upgrade to USB2.0. There are currently two methods:
2. By adding a USB2.0 pci card (divided into two ports and four ports), insert it into thePCI slotJust go up.This mode can achieve a transmission speed slightly lower than USB2.0 full speed and much higher than USB1.1.
