Universal Serial Bus - USB 2.0 Cables
We manufacture and supply USB 2.0 cables in low, medium, and high volume to our OEM, ODM and reseller customers throughout the industry. Our state of the art cable assembly equipment, expert engineering and manufacturing personnel, and flexible manufacturing allow us to outshine our competition in terms of both
quality and great prices.
Fundamentals of USB and USB Cables
Universal Serial Bus, or USB for short, was originally designed in 1993 by a group of companies including Intel, Compaq, Digital, Microsoft and NEC. USB requires a PC, but is relatively cheap to
implement since it leverages the power of the computer's CPU. This is much faster than the slow COM ports that the standard is intended to replace. Furthermore, USB represents a great leap in user friendliness and the cost effectiveness of the USB cables. It is considered a primary hardware interface for low-speed peripherals such as: keyboard, mouse, joystick, scanner, printer, and telephony devices.
The USB contains two connector types - A and B. All USB ports on your PC will be of Type A. Type A is also used on those devices in which the external cable is permanently attached, such as keyboards and mice. Type B is used in applications which require detachable external cable such as printers, scanners and modems. A Type A/B cable is used to connect these devices to a hub (distribution box) and to connect the hub directly to your PC
USB follows a tiered star topology where hubs are necessary, but can be nested. A USB port can support up to 127 devices, all sharing the same bandwidth. The standard allows for devices to be powered from the port as well as from external power sources. Some notebooks do not provide enough power to their USB ports to run external devices requiring port power. It also supports MPEG-1 and MPEG-2 digital video. USB has a maximum bandwidth of 12 Mbits/sec, however USB 2.0 goes to 480 Mbits/sec.
USB's hot swap capability allows USB cables to be plugged in and unplugged without turning the system off. USB ports began to
appear on PCs in 1997, and Windows 98, 2000 and ME fully support it. Devices are plugged directly into a four-pin socket on the PC or into a multi-port hub that plugs into the PC.
The USB bus distributes 0.5 amps (500 milliamps) of power through each port. Thus, low-power devices that might normally require a separate AC adapter can be powered through the cable. Hubs may derive all power from the USB bus (bus powered), or they may be powered from their own AC adapter. Powered hubs with at least 0.5 amps per port provide the most flexibility for
future downstream devices. Port switching hubs isolate all ports from each other so that one shorted device will not bring down the others.
The USB Connectors
USB ports on the PC and hubs use a rectangular Type A socket. All cables that are permanently attached to the device have a Type A plug. Devices that use a separate USB cable have a square Type B socket. The USB cable that connects them has a Type A and Type B plug.
Expected after 2001, USB 2.0 dramatically increases capacity to 480 Mbits/sec, which challenges FireWire (IEEE 1394) as the serial interface of the future.
Although USB support is built into newer versions of both Windows and the Mac OS, it is not compatible with all operating systems and some USB devices will not work with older versions of Windows.
- Windows 95 OSR 2.1 provides support for some USB devices.
- USB support is built into Windows 98 and Windows 2000
- Macintosh systems with OS 8.1 or higher support USB.
- Linux systems can also support USB, especially with the V2.4 kernel.
- Windows NT 3.5 and 4.0 do not support USB.
- Macintosh systems 8.0 or lower do not support USB.
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