USB 2.0 vs. USB 3.0

USB 2.0		USB 3.0
Released	April 2000	November 2008
Speed	High Speed or HS, 480 Mbps	10 times faster than USB 2.0. Super Speed, 4.8 Gbps.
Signaling Method	can either send or receive data.	can send and receive data simultaneously
Price	the USB 2.0 version is generally less expensive than it's USB 3.0 version.	the USB 3.0 version is generally more expensive than it's USB 2.0 version.
Power Usage	Up to 500 mA	Up to 900 mA. .
Number of wires within the cable	4	9
Standard-A Connectors	Grey	Blue
Standard-B Connectors	Smaller in size	Extra space for more wires
Max Cable length	5 meters	3 meters

NFC

It is a wireless connectivity technology that allows convenient short-range communication between electronic devices. NFC connects all type of communication devices and allow easy communication between them.

Advantages

it is a secure gateway to the connected world, now NFC-enabled mobile devices will allow consumers to store and access all kinds of their personal data at home. they can easily do this by bringing two NFC devices close, they at once initiate network communication without the help of user to make them do so. NFC-enhance devices can easily exchange and store your personal data like messages, pictures, MP3 files, etc. providing ease of use, instant intuitive connectivity, zero configuration and smart key access, NFC fulfils all the needs of connected consumers and provides better networks services for phones.

Cell phone vs Landline

BENEFITS OF A CELL PHONE

Here you will learn if either cell phones are better or landline is better so by reading the points below you will get to know which is better.

Mobility:  this is very obvious and you experience it in your daily life that a mobile phone can be carried anywhere  you want whereas a landline cant be taken anywhere the reason being that it always needs a base unit to connect it and make a call. and a mobile phone can be carried anywhere and you can make calls from anywhere you are no matter what.

Functionality:  this is very obvious that the functionality of a mobile phone is much more than a landline. by using a phone you can text, send voice mail, take pictures, make calls, use internet, GPRS, different kind of apps and many more but a landline can only make calls.

Cost: A mobile phone may be more cost efficient because if offers its users different kind of packages whereas a landline does not provide any such kind of packages.

BENEFITS OF A LANDLINE

 

Reception: Even though a mobile phone has become very efficient and convenient in use but still a phone does not provides a clear reception and smooth phone calls as a landline.

Family: some people don't want to buy their kids a cell phone because of some kind of personal reasons but they at the same time want to stay connected with them so a landline is a very good way of doing so.

Emergencies: in an emergency case you can easily dial 911 and the authorities will get to know your location at the very instant but if youre calling them using a cell phone it will be difficult and time taking for them to locate you.

 

WiFi VsWimax

Wi-Fi products are used to build WLANs, while WiMAX products are used to build WMANs.

A Wireless Local Area Network (WLAN) is a group of devices linked together by wireless within a relatively small space like a single office building or home. Three WLAN technologies were included in the original 802.11 standard: Infrared, Frequency Hopping Spread Spectrum (FHSS), and Direct Sequence Spread Spectrum (DSSS). 802.11b focused exclusively on DSSS; 802.11a/g/n also used Orthogonal Frequency Division Multiplexing (OFDM).

Wi-Fi is a certification applied to 802.11a/b/g/n products tested by the Wi-Fi Alliance, an industry consortium that promotes interoperability in heterogeneous WLANs. For example, all 802.11g products implement standard OFDM and DSSS, but only Wi-Fi certified products have proven that they correctly support a mandatory subset of features and options.

To create a WLAN, enterprises, small businesses, and home owners can purchase Wi-Fi certified Access Points (APs) and clients (laptops, phones, printers). Clients must be no more than a few hundred feet from the closest AP. Larger buildings can be covered by installing multiple APs that are connected to each other. Most WLANs are deployed indoors, but WLANs can also cover parking lots or courtyards or other local outdoor areas.

Wireless Metropolitan Area Networks (WMANs) use wireless "last mile" technologies to connect subscriber stations (customer premise equipment) to base stations (carrier network infrastructure), providing a wireless alternative to wireline Internet access technologies like DSL, cable, or fiber.

802.16 standards define several WMAN technologies that operate at various frequencies, distances, and speeds to deliver Broadband Wireless Access (BWA). The original 802.16 focused on Fixed BWA, using point to point wireless uplinks to connect subscriber networks to carrier networks and the Internet. More recently, the 802.16e amendment defined Mobile BWA to serve subscriber stations that are not fixed in place, like laptops used in cars and trains.

WiMax is a certification applied to 802.16 products tested by the WiMAX Forum. Carriers build and operate WMANs by purchasing licensed spectrum and then deploying WiMAX base stations throughout a city, region, or other designated coverage area. To use the WMAN, subscribers must purchase wireless services from a carrier. For example, Sprint recently launched a commercial WiMAX service called XOHM in Baltimore. Consumers in and around Baltimore that want to use XOHM must purchase a compatible WiMAX device and pay Sprint for air time.

Here are some key differences between WLANs and WMANs, supported by Wi-Fi and WiMAX products:

1        It's possible to use WMAN technology indoors, but 802.16 protocols are optimized for outdoor operation. It's possible to use WLAN technology outside, but 802.11 protocols were primarily designed for indoor networks.

•         Larger WLANs can be constructed using many densely-spaced Wi-Fi APs, but to blanket miles of territory with wireless, you really want to create a WMAN technology. On the other hand, using WiMAX products for communication between PCs inside the same building would be pricey and impractical -- that's precisely what WLAN technologies were created for.

•         Most office and home WLANs are composed of Wi-Fi products operating in unlicensed spectrum -- channels freely available for use by anyone. WiMAX products most often operate in spectrum licensed to wireless carriers who use them to deliver commercial BWA services.

For nuts-and-bolts differences, check out Michael Finneran's excellent paper on WiMax versus Wi-Fi.

The bottom line is that WLANs and WMANs are complementary network architectures, supported by standard technologies that were designed for very different environments and purposes. This is why your next laptop may well include both Wi-Fi and Mobile WiMAX adapters. Use the Wi-Fi adapter to connect to your office or home WLAN free-of-charge, but use the WiMAX adapter when you're on the go to reach the Internet through a carrier's WMAN.

 

Bluetooth Vsinfrared

Infrared technology is used in remotes. the more the strength of the remote the more the infrared rays can travel, but for household electronics the range is less then 50 feets. in order to have a signal detected there should be a straight line between the transmitter and the receiver. If there is a wall or large object between the transmitter and receiver than  the signal will not pass through it.

Bluetooth  uses a radio frequency, which allows transmission of infrared signal through walls and other big objects. The range  Bluetooth device is about 30 ft. Because Bluetooth technology is based on a standard 2.4 GHz frequency, different Bluetooth devices can easily communicate with each other, regardless of the manufacturer. this means that it can be of any company not necessary Samsung or acer or any other manufacturer. 
While Bluetooth is well on its way to replacing infrared in many different areas, the technology is not meant to be used for wireless networking. Instead, wifi technology, which has a larger range and higher bandwidth than Bluetooth, is the standard that most wireless networking equipment uses to compare.

Side Effects of facebook

facebook is a social networking site. it has reduced the distance between people to a great extent but at the same time it has many adverse effects too. some parents allow their children to use facebook and they get involved in wrong activities without their parents knowledge and hence create troubles for themselves and others too. people keep on posting silly statuses and when some one else see them they develop envious and jealous feelings which results in the destruction of the peace of their mind and the society. many fake accounts are made and people are targeted. so the use of facebook should be avoided as it leads to many problems if not used in a right way. 

Difference between 3G and 4G

	3G	4G
Data Throughput	Up to 3.1Mbps	2 to 12 Mbps .
Peak Upload Rate	5 Mbps	500 Mbps
Peak Download Rate	100 Mbps	1 Gbps
Switching Technique	packet switching	packet switching, message switching
Network Architecture	Wide Area Cell Based	LAN and Wide area.
Services And Applications	CDMA 2000, UMTS, EDGE etc	Wimax2 and LTE-Advance
Forward error correction (FEC)	3G uses Turbo codes for error correction.	Concatenated codes are used for error corrections in 4G.
Frequency Band	1.8 – 2.5 GHz	2 – 8 GHz