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4G was made available as early as 2005 in South Korea under the name WiMAX and was rolled out in several European countries over the next few years. It became available in the United States in 2009, with Sprint being the first carrier to offer a 4G cellular network.
All 4G standards must conform to a set of specifications created by the International Telecommunications Union. For example, all 4G technologies are required to provide peak data transfer rates of at least 100 Mbps. While actual download and upload speeds may vary based on signal strength and wireless interference, 4G data transfer rates can actually surpass those of cable modem and DSL connections. |
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network backbone carries data to smaller lines of transmission. A local backbone refers to the main network lines that connect several local area networks (LANs) together. The result is a wide area network (WAN) linked by a backbone connection.
The Internet, which is the ultimate wide area network, relies on a backbone to carry data over long distances. The Internet backbone consists of several ultra-high bandwidth connections that link together many different nodes around the world. These nodes route incoming data to smaller networks in the local region |
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| The term "cloud" comes from early network diagrams, in which the image of a cloud was used to indicate a large network, such as a WAN. The cloud eventually became associated with the entire Internet, and the two terms are now used synonymously. The cloud may also be used to describe specific online services, which are collectively labeled "cloud computing." |
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| A domain name is a unique name that identifies a website. For example, the domain name of the Tech Terms Computer Dictionary is "techterms.com." Each website has a domain name that serves as an address, which is used to access the website. |
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| little text-based faces and objects that you often see in e-mail and online chat. They help give the reader a sense of the writer's feelings behind the text. For example, the classic =) face shows that the writer is happy about something or that his message in good humor. The =P face is used to show frustration or to say "Whatever..." Emoticons can also be used to create real-world objects. |
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| While "Flash" was the name of a popular superhero in the 1970s, today the term refers to something completely different. When you see Flash on the Web, it most likely refers to Adobe Flash, a multimedia technology. Flash allows Web developers to incorporate animations and interactive content into their websites. |
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| Graymail describes email messages that are generally unwanted, but do not fit the definition of spam. Unlike spam, graymail includes messages from mailing lists and newsletters that you have legitimately signed up to receive. Over time, these messages can begin to clutter your inbox and can easily be mistaken for spam |
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| describes a Web application that combines multiple services into a single application. For example, a Web forum may contain a mashup that uses Google Maps to display what parts of the world the users are posting from. Yahoo offers a mashup called Yahoo! Pipes that aggregates RSS feeds into a single page that can be navigated using a graphical interface. |
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A mirrored volume is a hard drive or other form of storage media that stores an exact copy of the data from another volume. It is used for fault tolerance, which means mirrored volume serves as a backup device in case the primary device fails.
Companies and organizations that store critical information typically "mirror" the data on another drive. Using a mirrored volume decreases the chance of losing data exponentially. For example, if the odds of a hard drive going bad is 1 out of 200, the odds of two drives going bad at the same time is 1 out of 40,000. |
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This ferocious cat is the code name for Mac OS X 10.4, released April 29, 2005. Tiger follows a list of other felines in the Mac OS X lineup, including Panther (10.3), Jaguar (10.2), Puma (10.1), and Cheetah (10.0). Apple originally used the cat names as internal names for the operating system development, but actually started to market the names with the release of Jaguar.
According to Apple, Tiger includes over 200 improvements from Mac OS X 10.3. A few of the most notable additions include an enhanced search feature called "Spotlight," an internal scripting program called "Automator," and quick information access via widgets from the new "Dashboard |
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