Clarinet USB platform
Universal Serial Bus (USB) is a new communication standard device developed by the computer and telecommunication industries.
USB provides a powerful hot-plug-capable; "true plug-and-play" interface
between a host computer and add-on peripheral devices.
USB devices use two types of plugs, Type A and Type B:
- Type A Plug connects to the host computer or an upstream
- Type B Plug connects downstream to the USB device. It has a
sort of "house-shape" design. Some devices(like a mouse)
have the cable soldered into the device, and therefore don't use
- Each connector has four pins, two for power and two for data.
- USB ports, cables, and plugs are often labeled with this standard
Acacia chose to adopt USB since USB offers many advantages that benefit
- USB host is available on any new Notebook or Desktop computer
- USB uses reliable and low-cost connectors
- USB offers hot-plug-capable, auto-configuring ease of use.
- All without having to restart the host computer or even go into
USB also provides a fast connection and a large number of ports
(by daisy-chaining up to 127 devices).
The 3 steps to build a protocol test platform:
- Select any PC equipped with built-in USB interfaces and run Windows 98 or Windows 2000.
- Install the Clarinet Run-time Package (version 10.1 or greater)
- Plug the Clarinet-Book USB device into an available port. The
Clarinet device is "bus-powered" by the USB network. The
device should be sensed automatically, driver should automatically
load, and the device should then be ready for use.
A single USB port notebook drives Clarinet E1/T1 directly without any other connection
besides the USB cable.
Most desktops and some notebooks have a Host
supporting two USB ports. A dual USB port notebook drives two
Clarinet E1/T1 devices directly without any other connection but the USB cable. Both
devices are synchronized by the USB bus to provide a common time-stamping
(accuracy of 1 ms).