USB 1.1
The Universal Serial Bus is the most widely deployed PC peripheral interface in history, enabling simple plug and play connectivity for a wide variety of devices to enhance the computing experience. Developed to improve ease of use and provide flexible port expansion, the USB bus has become an indispensable computing technology. USB 1.1 provides support for two interface speeds: Low Speed at 1.5Mb/s and Full Speed at 12Mb/s. The two interface speeds target specific classes of devices to provide the most efficient and cost-effective interconnect solution. Low speed devices are typically interactive input devices such as keyboards, mice or game controllers. Full speed devices are typically application specific input devices such as microphones, cameras and printers.  Despite the introduction of USB 2.0 and 3.0, USB 1.1 is still a very viable and usable option, depending on your application and speed requirements.

USB 2.0
The Universal Serial Bus is the most widely deployed PC peripheral interface in history, enabling simple plug and play connectivity for a wide variety of devices to enhance the computing experience. As PC’s and peripheral devices have added more processing bandwidth, performance and features, the USB 2.0 standard was developed to offer a complimentary high-speed transfer rate at 480Mb/s. Backwards compatible with the full speed and low speed transfer rates of USB 1.1, USB 2.0 delivers a significant bandwidth increase while maintaining the value added features that motivated the original USB development.

Super Speed USB 3.0
As technology innovation marches forward, new kinds of devices, media formats, and large inexpensive storage are converging. They require significantly more bus bandwidth to maintain the interactive experience users have come to expect. In addition, user applications demand a higher performance connection between the PC and these increasingly sophisticated peripherals. USB 3.0 addresses this need by adding an even higher transfer rate to match these new usage and devices.
USB continues to be the answer to conncectivity for PC, Consumer Electronics, and Mobile architectures, It is a fast, bidirectional, low-cost, dynamically attachable interface that is consistent with the requirements of the PC platforms of today and tomorrow.

SuperSpeed USB brings significant performance enhancements to the ubiquitous USB standard, while remaining compatible with the billions of USB enabled devices currently deployed in the market. SuperSpeed USB will deliver 10x the data transfer rate of Hi-Speed USB, as well as improved power efficiency.

• SuperSpeed USB has a 5 Gbps signaling rate offering 10x performance increase over Hi-Speed USB.

• SuperSpeed USB is a Sync-N-Go technology that minimizes user wait-time.

• SuperSpeed USB will provide Optimized Power Efficiency.No device polling and lower active and idle power requirements.

• SuperSpeed USB is backwards compatible with USB 2.0. Devices interoperate with USB 2.0 platforms. Hosts support USB 2.0 legacy devices.

The USB 3.0 SuperSpeed specification has been ratified. The SuperSpeed specification provides the technical details to understand USB 3.0 requirements and design USB 3.0 compatible products and is available for download from the official USB website at www.usb.org/developers/docs/.
Check our MilesTek’s complete line of USB products, http://www.milestek.com/search.asp?skw=ZZAVD

RG6 Dual Shield vs. RG6 Quad Shield?

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RG6 Quad shield and RG6 Dual shield are pretty much identical in terms of signal loss.  However, when it comes to rejecting interference, Quad is far superior and should be used in high EMI environments.  If there is absolutely no chance of interference, Dual would be fine.

Check out MilesTek’s offering of RG59 and RG6 coaxial cables:
 http://www.milestek.com/lp_coax_cable.asp

RG59 Coax vs. RG6 Coax?

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The first obvious difference between RG59 and RG6 is the diameter of the cables themselves.  Standard RG59 coax has a 20 AWG copper center conductor and RG6 coax has an larger 18 AWG copper center conductor, offering higher bandwidth and longer distance capability.

Generally, RG6 is widely used in CATV and Satellite DSS applications and RG59 is used for in analog CCTV or baseband video applications. RG6 Dual or Quad Shield shouldn’t be utilized for baseband applications, such as video projectors, component video, plasma TV’s, etc. It may sound like a great solution because of all the layers of shielding, but RG6 Dual and Quad Shield don’t have the proper type of shielding for the above described applications. It is manufactured using foil shields and braided aluminum shields. The makeup of the shields differs between models. The effective range of operation for foil shields is above 50MHz, which makes them perfect for rejection of radio frequency interference, or RFI, that may have an effect on satellite or cable installations. At frequencies below 50 MHz, however, foil shields are not effective. The braiding on the RG6 Dual shield and the RG6 Quad shield doesn’t have enough coverage to work effectively with baseband applications.

The frequencies that are used in High Definition are usually around 37 MHz. For those lower frequencies, an RG59 with a 95% all-copper shield is designed to block RFI inclusion at base band frequencies. Because RG59 does not have a foil shield, it shouldn’t be utilized for satellite feeds or cable feeds.

RG59 has a little less signal reduction, or attenuation, over 100 feet. The shielding on RG59 does not work quite as well to maintain Gigahertz level signals inside of the center conductor. RG6 has a better design for maintaining the signal levels inside the center conductor. This is the reason RG6 has become the standard for broadband CATV and satellite systems. A basic rule of thumb is to use RG6 for any Rapid Frequencies, and use RG59 for video frequencies. RG6 has an aluminum braid and an aluminum shield. RG59 comes with a copper braid, and in some instances, an aluminum braid and shield, although this is quite rare.

Check out MilesTek’s offering of RG59 and RG6 coaxial cables:
 http://www.milestek.com/lp_coax_cable.asp