Wireless Technology Drawback

Lenovo IdeaCentre B520

The Lenovo IdeaCentre B520 ($1,799 list) is one of the few truly 3D-capable all-in-one desktops out on the market. For that admittedly high price tag you'll receive a quad-core processor, lots of hard drive space, and the capability to view just about any video that exists today. You can watch TV over the Internet, Blu-ray (2D and 3D), DVDs, downloaded videos, over the air HDTV, programming from your HD DVR, and even video from an old VCR (provided the VCR still works). For those video-obsessed nuts out there that must have the Star Wars saga on every format, we may have the PC of your dreams. For all others, there are more sedate choices that work better as a run-of-the mill touch screen PCs.

Design
The B520 is an evolution of the design seen on systems like the Lenovo IdeaCentre B305 ($949 list, 3.5 stars) and B500 ($1,399 direct, 4 stars). The B520 shares the look and feel of the previous systems, including the prominent speaker bar below the screen, which blocks under-chassis storage for the wireless keyboard and mouse. A notable new feature is the seamless glass in front of the system's touch screen. Previous touch screens required a gap between the screen surface and the outer bezel in order to house the system's IR light-based sensors. Essentially, the system's IR sensors beam a grid across the screen, and when your finger crosses the streams, it registers the touch. The seamless screen on the B520 uses projective capacitive technology, which is more like the touch technology on most smartphones and tablets. The result is that the touch screen is more responsive and more accurate. It also means that the glass screen can be more easily cleaned (less nooks and crannies to trap dust) and the screen looks more like a standard widescreen HD monitor.

The B520 has a bunch of external ports for expansion, including six USB 2.0 ports, HDMI in, HDMI out, composite video AV in, and the usual audio and Ethernet ports. The system lacks newer ports like USB 3.0 and eSATA, but the two HDMI ports and composite AV port mean that this desktop will last beyond its internal technology. The HDMI in port gives you a way to extend the monitor's life by hooking up a separate DVR, gaming console, or a future PC. Once the B520's formidable innards become obsolete, the screen can live on as the external monitor for another laptop or desktop. The composite AV port looks to the past, allowing you to hook up an old school VCR for viewing those relic VHS tapes stored in your garage. The back of the system is easy to open without tools, so you can get to the hard drive and memory slots. You'll have to replace them if you want more space, but with 8GB of memory and a 2TB 7,200rpm hard drive in this configuration, you probably won't have to upgrade for a long time.

Understanding Bluetooth Technology | Digital Technology

Blue tooth is a telecommunications device for wireless individual location network which describes how mobile phones, computers, laptops, printers, video game consoles and digital camera can be interconnected making use of a short range wireless connection. With the assist of this technologies, users of cell phones, personal digital assistants and pagers can get synchronized with details and have all mobile and personal computer devices be fully coordinated. The term blue tooth derived its name from a tenth century Denmark king Herald blue tooth Blatand who united Denmark and Norway and was popular for his ability to support people to communicate with every other.

To include blue tooth facility, a low cost transceiver chip need to be included in every single device, which transmits and receives in an unused frequency band accessible globally.

Considering that blue tooth uses radio waves in 2.four-gigahertz range, it is designed such that it is a safe and affordable way of connecting and exchanging details between devices without wires. Since it uses a typical protocol, transmission of information between two blue tooth devices from various manufacturers would be straightforward. If the mobile phone has blue tooth hardware, blue tooth drivers are not necessary because the computer software is inbuilt and ready for use. Then blue tooth can be used to beam the photos and other objects from the mobile telephone to the laptop or a PC provided the PC also has the blue tooth.

Blue tooth and wi-fi are both radio technologies but the frequencies and protocols are various and both of them are not compatible on the same device. The speed and the power of a blue tooth are lower than that of wi-fi. To pair one blue tooth device to an additional, a pass code need to be exchanged between the two devices. Although connecting the very first, it asks for a 4-digit pass code and then the other device asks for the pass code where the identical pass code should be given.

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