2G is an acronym for second-generation wireless telephone technology. While its predecessor 1G, made use of analog radio signals, 2G uses digital radio signals. Based on what type of multiplexing (the process of combining multiple digital data streams into one signal) is employed, 2G technologies may be categorized by whether they are based on time division multiple access (TDMA) or code division multiple access (CDMA). 2G makes use of a CODEC (compression-decompression algorithm) to compress and multiplex digital voice data. Through this technology, a 2G network can pack more calls per amount of bandwidth as a 1G network. 2G cellphone unitsRead More
General packet radio service (GPRS) a standard for wireless communications in which a packet oriented mobile data service is available to users of the 2G ,GSM and 3G technology. GPRS data transfer is typically charged per megabyte of traffic transferred, while data communication via traditional circuit switching is billed per minute of connection time, independent of whether the user actually is using the capacity or is in an idle state. GPRS, which supports a wide range of bandwidths, is an efficient use of limited bandwidth and is particularly suited for sending and receiving small bursts of data, such as e-mail andRead More
GSM is an acronym for 'Groupe Special Mobile', which has now been changed to 'Global System for Mobile Communication'. CDMA refers to 'Code Division Multiple Access'. The working of GSM and CDMA is very different. How GSM works. GSM is a 'cellular' technology, that is, the entire coverage area is divided into various hexagonal shaped cells. Every cell has a corresponding network tower, which serves the mobile phones in that cellular area. That is the entire frequency band is divided into chunks and each such chunk is divided into timeslots and each such portion is made available to a user. How CDMA works. InRead More
A proxy server is a server that acts as an intermediary for requests from clients seeking resources from other servers. This server sits between a client application and its real web server. The client application is typically a web browser. The proxy server intercepts all messages to the server and fulfills the client requests itself if it can. A client connects to the proxy server, requesting some service, such as a file, connection, web page, or other resource, available from a different server. The proxy server evaluates the request according to its filtering rules ( IP address or protocol).Read More
Hacking is the practice of modifying computer hardware and software to accomplish a goal outside of the creator?s original purpose which is an unauthorized attempts to bypass the security mechanisms of an information system or network. People who engage in computer hacking activities are often called hackers. A hacker is a person who breaks into computers and computer networks, either for profit or motivated by the challenge. Hacker attitudes Broadly Hackers can be demarcated into- a) White Hat - breaks security for non-malicious reasons, for instance testing their own security system. b) Grey Hat - a hacker of ambiguous ethics and/or borderline legality. c)Read More
POP3 is an acronym of Post Office Protocol 3. POP3 is a protocol that provides a simple, standardized way for users to access mailboxes and download messages to their computers. What it does, is,it downloads mail from your mail-server and stores it for the user, till the user downloads the mail. The stored POP3 mails get deleted as soon as the user downloads the stored mails. It can be be thought of as a 'store-and forward' email service. Thus this allows users with temporary internet connections to view mails when online, and to view and manipulate messages theseRead More
A podcast is a series of digital media files (either audio or video) that are released episodically(episode wise) and often downloaded through web marketing. The word took over webcast in common jargon, due to rising popularity of the iPod and the innovation of web feeds. In very layman term we can say- an audio programme in a compressed digital format, delivered via an RSS feed over the Internet to a subscriber and designed for playback on computers or portable digital audio players, such as the iPod. The logo used by Apple to represent Podcasting.
A webcast is a media file distributed over the Internet using streaming media technology to distribute a single content source to many simultaneous listeners/viewers. A webcast may either be distributed live or on demand. Essentially, webcasting is ?broadcasting? over the Internet. For example, a university may offer on-line courses in which the instructor Webcasts a pre-recorded or live lecture, or an enterprise may Webcast a press conference in lieu of or in addition to a conference call. The ability to webcast using cheap/accessible technology has allowed independent media to flourish. There are many notable independent shows that broadcast regularly online.
IPTV is an acronym for Internet Protocol television through which internet television services are delivered using the architecture and networking methods of the Internet Protocol Suite over a packet-switched network infrastructure, e.g., the Internet and broadband Internet access networks, instead of being delivered through traditional radio frequency broadcast, satellite signal, and cable television (CATV) formats. In Simple words It is a service where digital cable network is delivered over internet networks rather than on cable or satellite Television. IPTV services may be classified into three main groups: a) live television, b) time-shifted programming, and c) video on demand.
The orange square with a dot and 2 curvy lines you see on almost every website these days is called an RSS feed. It's an acronym for Really Simple Syndication. The RSS feed basically provides access to all newly published content whether audio, video or text in a standardized format. Usually, one subscribes to RSS feeds of newspapers, blogs, news websites and your bookmarked items. RSS solves a problem for people who regularly use the web. They benefit readers who want to subscribe to timely updates from favored websites or to aggregate feeds from many sites into one place, toRead More