USB 2.0 Compliance Testing with Infiniium Oscilloscopes
应用文章
Universal Serial Bus (USB) burst on the scene in 1995 delivering a revolutionary way to connect personal computers and devices. Allowing hot-plug capability, USB has introduced ease-of-use to the PC device market by providing a simple connection scheme and protocol for a wide variety of computer devices, ranging from keyboards and mice to high-bandwidth devices such as printers, scanners, and cameras.
USB has now successfully replaced aging serial and parallel ports as the connection of choice for both device manufacturers and end users. Whereas cable length and device expansion were limitations with older serial and parallel connections, they are no issue for USB. Amazingly, it allows devices to exist up to 30-meters away from the host, and allows up to 127 devices to be connected to a single host and port at once through a series of USB hubs. The ability to talk directly to devices or to devices through hubs allows for this incredible expansion capability.