Friday, July 23, 2010

Airtel 3G Data Card

The data card can work on all the partner networks of Airtel when on national roaming and is compatible with GSM network while on international roaming, the company said in a statement.

Before launching the 3G services , Airtel has launched the new USB 3G data card . The new Airtel 3G Data Card will be currently used for wireless Internet access over Airtel 2G/2.75G GSM services across India.Once Airtel launch their 3G services , the same data card can be used to access the 3G network.

Airtel broadband has earned its reputation by providing better broadand services and customer support then its competetors but airtels data card isint doing very well on that font.I used airtel data card for about 4 months and I hated it so much that I gave it to some one for free and got rid of the connection as well. I used to pay I think Rs500 per month and I was never able to log into my google adsense account not even once and nor was I able to log into paypal as the connection would time itself out by the time the page loaded.
I have got a new reliance data card now and I am more then happy with the performance both quality wise and speed.

Airtel 3G Data Card Price RS 3,499 For postpaid and prepaid users in India, Delhi, Mumbai, Chennai, Hyderabad, Pune, Bangalore

Airtel 3G Data Card is about the Airtel 3G Data card and USB Modem that can be used to surf the web wirelessly. Of course,Airtel 3G Data Card has to be noted that even though this is a 3G Data card, you’ll only be connected to 2G network at present and get speeds of GPRS/EDGE until 3G is rolled out Airtel, probably in 3-4 months time.

Airtel 3G Data card Full Card Specifications :

Airtel 3G Data card work on a Quadband, UMTS/HSDPA Cat 6 with a maximum speed of 3.6Mbps. As said before, until 3G arrives this will automatically downgrade to GPRS/EDGE network.

Simply put your Airtel Sim card in the USB Data card and plug it into the USB Port of your Laptop or Desktop. Airtel 3G Data card is compatible with Windows 2000/XP/Vista/7 and also Mac OS. You can send and receive SMS from your PC using this Data card. Normal SMS charges apply.

Airtel 3G Data card Tariff plans (prepaid Airtel 3G Data Card )

Plan I costs Rs.349 for which 500MB of Data can be used. Plan II costs Rs.599 which gives 1GB free Data and plan III gives 2GB of Data for Rs.899.

These are the tariff plans given by Airtel for prepaid users. It’s most likely that the administrators at Airtel website forgot to update that information since all you need now to get 2GB of GPRS/EDGE Data is Rs.98 per month.

Purchase this data card for Rs.3349 and use the Rs.98 per month data plan until 3G arrives. 3G data service will surely have different tariff plans.

Description of Airtel 3G Data Card :

Date Of Purchasing-16/04/10 Airtel has started offering 3G broadband services in India.But there is a catch currently you can access internet with Airtel 3G Data Card at only 256kbps of speed not 3.6 Mbps. The reason behind this – India is yet to complete the auction of licenses for the 3G spectrum.As we know 3G auction will be completed in next three months then you can access Internet at speeds up to 3.6 Mpbs with Airtel 3G USB modem.Airtel 3G Data Card Price in India – Rs. 3,499/- Indian Rupee (INR) Airtel 3G USB modem is available in both prepaid and postpaid tariff.

One month validity Plans of Airtel 3G Data Card – Rs.349 will get 500MB data transfer,Rs.599 will get 1GB,and Rs.899 will get 2GB

Advantages:

High speed 24/7 Internet connectivity through Airtel EDGE network
Easy to install & simple to use with choice of tariffs to suit you needs
No automatic disconnection unlike normal dial-up connections
Send and Receive SMS via the Airtel Data Card
Connectivity to Internet when traveling in India or abroad so you save on high Internet charges on your hotel bills

Features:

International Roaming.
Plug & Play.
Quad band.
EDGE.
Plug & Play.
Use it for both Notebooks and PCs.
EDGE/ GPRS/GSM(SMS).
Data, SMS.
FOR USB PORT.
SMS facilities.

Different Plans

Plan I

Airtel Data Card Rental - Rs. 350
Free Bundled Usage - 500 MB
Free SMS per Month - Nil
Voice Plan - Voice Rental Inclusive
Additional Data Usage (per MB) - Rs. 5/-

Plan-2

Airtel Data Card Rental - Rs. 599
Additional Data Usage (per MB) - Rs. 5/-
Free Bundled Usage - 500 MB
Additional Data Usage (per MB) - Rs. 5/-
Free SMS per Month - Nil
Voice Plan - Voice Rental Inclusive.

Wednesday, July 21, 2010

Laptop RAM-Memory Price in India – DDR3,DDR2,DDR1

The term random in RAM refers to the fact that any piece of data can be returned in a constant time, irrespective of its physical location and whether it is related to the previous piece of data. RAM helps in accessing any byte of memory without touching preceding bytes. The word RAM is synonymous with the main memory and is reserved for computer related programs.

On the other hand, read-only memory (ROM) refers to computer memory which is used to store programs that boot the computer and perform diagnostics. Most of the computers have a small amount of ROM - around a few thousand bytes.

Random access memory is volatile, i.e. it requires a steady flow of electricity to maintain its contents and as soon as the power goes off, whatever data that was in the RAM is lost. RAM is commonly known as read/write memory and ROM as read-only memory. It is the most common type of memory found in computers and also other devices like printers.

History

During 1949 to 1952, the magnetic core memory was widely used as a writable random access memory. It was subsequently used in most computers, until the development of the static and dynamic integrated RAM circuits in the late 1960s and early 1970s. Before RAM, computers used delay line memory, relays and different kinds of vacuum tube arrangements to implement main memory functions, which were a few hundreds or thousands of bits. Latches built out of vacuum tube triodes and discrete transistors were used for smaller and faster memories such as registers and random access register banks. Before integrated ROM circuits were developed, random access memory was constructed using semiconductor diode matrices which were driven by address decoders.

How does RAM Works?

Like any other memory chip, RAM is made up of millions of transistors and capacitors. A transistor and a capacitor are paired to create a memory cell, which represents a single bit of data. The capacitor holds the bit information as 0 or 1 and the transistor acts as a switch which allows the control circuitry on the memory chip to read the status of the capacitor or change its state. The capacitor is like a small bucket that stores electrons. To store 1 in the memory cell, the bucket is filled with electrons, and to store 0 it is emptied. The problem with the capacitor's bucket is that it leaks and within few milliseconds the full bucket becomes empty. Therefore, either the CPU or the memory controller has to recharge all capacitors holding 1 before they discharge. For this, the memory controller reads the memory and then writes it right back. This refresh operation occurs automatically nearly thousands of times per second.

Types of RAM

The following are some common types of RAM:

SRAM: Static random access memory uses multiple transistors, typically four to six, for each memory cell but doesn't have a capacitor in each cell. It is used primarily for cache.
DRAM: Dynamic random access memory has memory cells with a paired transistor andcapacitor requiring constant refreshing.
FPM DRAM: Fast page mode dynamic random access memory was the original form of DRAM. It waits through the entire process of locating a bit of data by column and row and then reading the bit before it starts on the next bit. Maximum transfer rate to L2 cache is approximately 176 MBps.
EDO DRAM: Extended data-out dynamic random access memory does not wait for all of the processing of the first bit before continuing to the next one. As soon as the address of the first bit is located, EDO DRAM begins looking for the next bit. It is about five percent faster than FPM. Maximum transfer rate to L2 cache is approximately 264 MBps.
SDRAM: Synchronous dynamic random access memory takes advantage of the burst mode concept to greatly improve performance. It does this by staying on the row containing the requested bit and moving rapidly through the columns, reading each bit as it goes. The idea is that most of the time the data needed by the CPU will be in sequence. SDRAM is about five percent faster than EDO RAM and is the most common form in desktops today. Maximum transfer rate to L2 cache is approximately 528 MBps.
DDR SDRAM: Double data rate synchronous dynamic RAM is just like SDRAM except that is has higher bandwidth, meaning greater speed. Maximum transfer rate to L2 cache is approximately 1,064 MBps (for DDR SDRAM 133 MHZ).
RDRAM: Rambus dynamic random access memory is a radical departure from the previous DRAM architecture. Designed by Rambus, RDRAM uses a Rambus in-line memory module (RIMM), which is similar in size and pin configuration to a standard DIMM. What makes RDRAM so different is its use of a special high-speed data bus called the Rambus channel. RDRAM memory chips work in parallel to achieve a data rate of 800 MHz, or 1,600 MBps. Since they operate at such high speeds, they generate much more heat than other types of chips. To help dissipate the excess heat Rambus chips are fitted with a heat spreader, which looks like a long thin wafer. Just like there are smaller versions of DIMMs, there are also SO-RIMMs, designed for notebook computers.
Credit Card Memory: Credit card memory is a proprietary self-contained DRAM memory module that plugs into a special slot for use in notebook computers.
PCMCIA Memory Card: Another self-contained DRAM module for notebooks, cards of this type are not proprietary and should work with any notebook computer whose system bus matches the memory card's configuration.
CMOS RAM: CMOS RAM is a term for the small amount of memory used by your computer and some other devices to remember things like hard disk settings -- see Why does my computer need a battery? for details. This memory uses a small battery to provide it with the power it needs to maintain the memory contents.
VRAM: VideoRAM, also known as multiport dynamic random access memory(MPDRAM), is a type of RAM used specifically for video adapters or 3-D accelerators. The "multiport" part comes from the fact that VRAM normally has two independent access ports instead of one, allowing the CPU and graphics processor to access the RAM simultaneously. VRAM is located on the graphics card and comes in a variety of formats, many of which are proprietary. The amount of VRAM is a determining factor in the resolutionand color depth of the display. VRAM is also used to hold graphics-specific information such as 3-D geometry data and texture maps. True multiport VRAM tends to be expensive, so today, many graphics cards use SGRAM (synchronous graphics RAM) instead. Performance is nearly the same, but SGRAM is cheaper.

ATI Radeon HD 5850 – DirectX 11 graphics card

A graphics card (also video card) is a piece of hardware installed in a computer that is responsible for rendering the image on the computer’s monitor or display screen. Graphics cards come in many varieties with varying features that allow for a price range that extends from about $20 US Dollars (USD) to $2,400 USD or more.

The new ATI Radeon HD 5850 is the next-generation desktop graphics cards,part of the AMD’s ATI Radeon HD 5000 series of GPUs.It supports Microsoft’s upcoming DirectX 11 API.

Prepare to experience a riveting high-definition gaming experience with the new ATI Radeon HD 5850graphics processors.Expand your visual real estate across up to three displays and get lost in the action with revolutionary ATI Eyefinity Technology. Using ATI Stream technology, accelerate even the most demanding applications and do more than ever with your PC.The first to deliver full support for Microsoft DirectX® 11, these GPUs enable rich, realistic visuals and explosive HD gaming performance so you can dominate the competition.

The first consideration when buying a graphics card is to be sure it is capable of displaying the best resolution the monitor can support. For Liquid Crystal Display (LCD) monitors this means supporting the native resolution. Cathode Ray Tube (CRT) monitors do not have a native resolution. In this case, ensure the graphics card is capable of supporting the highest resolution, even if the CRT monitor will be frequently used at lower resolutions.

The second consideration is on-board memory. A graphics card must work very hard to render images to the screen. Unlike text files, graphics images are much larger files consisting of great amounts of data that must be processed by the graphics or video card. A faster graphics card has its own resident memory chips to perform this function so as not to impinge upon the system’s random access memory (RAM). Less robust graphics cards have less resident memory and require sharing system RAM to process images.

The graphics processing unit (GPU) is a chip akin to the computer processing unit (CPU). The GPU on the graphics cardprocesses data in parallel lines called “pipelines.” The more pipelines a graphics card has, the faster it can process data. Some cards feature dual GPUs for additional performance. Other factors that play into performance include bus speed and the type of on-board memory the graphics card supports.

Because graphics cards work hard they generate heat. For this reason most high-performance video cards utilize built-in fans. Fans can be quiet or noisy, depending on the card model. High-performance fanless video cards are also available. These cards use heat syncs to pull heat away from the GPU. The advantage of a fanless graphics card is lack of noise; disadvantages include expense and a wider footprint that can take up two slots inside the computer.

Installing a graphics card is very easy. The card features an interface that plugs into a port or slot inside the computer on the motherboard. Older motherboards offer an Advanced Graphics Port (AGP) interface, while newer boards have the faster Peripheral Computer Interface Express (PCIe) interface. A PCIe graphics card cannot be installed into an AGP slot, and visa-versa, so be sure to get a card that is compatible with your system.

Features & Benefits of ATI Radeon HD 5850 graphics card

Get unrivalled visual quality and intense gaming performance and for today and tomorrow with support for Microsoft® DirectX® 11
With ATI Eyefinity technology get the ultimate immersive gaming experience innovative ‘wrap around’ multi-display capabilities
Tap into the massive parallel processing power of your GPU with ATI Stream technology and tackle demanding tasks like video transcoding with incredible speed
Feel the brute strength of more than 2 teraFLOPS plowing through the most demanding games
Experience the speed, responsiveness and performance of ultra-high bandwidth GDDR5 memory
ATI CrossFireX™ technology with multi-GPU support offers advanced scalability

Monday, July 19, 2010

PRINTER

HP LaserJet Pro P1606dn – Monochrome laser Printer with WiFi

In computers, a printer is a device that accepts text and graphic output from a computer and transfers the information to paper, usually to standard size sheets of paper. Printers are sometimes sold with computers, but more frequently are purchased separately. Printers vary in size, speed, sophistication, and cost. In general, more expensive printers are used for higher-resolution color printing.

The new HP LaserJet Pro P1606dn Printer is a compact and fast,entry level mono laser, printing at 25ppm.It feature industry-first ‘plug and print’ technology that allows customers to begin printing in as little as two minutes. Also, industry-first HP Auto-On/Auto-Off technology that uses up to three times less energy versus sleep mode.

HP LaserJet Pro P1606dn Printer key features :

Single-function laser printer

Connectivity: USB 2.0, Ethernet

Automatic duplexer (double-sided printing)

Auto-on/Auto-off technology

Print speed black (normal, A4) Up to 25 ppm

Maemory 32 MB

Processor speed 400 MHz

Duplex print options Automatic (standard)

Media sizes supported : A4, A5, A6, B5, postcards, envelopes (C5, DL, B5)

Standard connectivity :Hi-Speed USB 2.0 port, 10/100 Ethernet networking

Optional connectivity :HP Jetdirect en3700 Fast Ethernet Print Server; HP Jetdirect en1700 IPv4/IPv6 Print Server; HP Jetdirect ew2500 802.11g Print Server

The four printer qualities of most interest to most users are:

Color: Color is important for users who need to print pages for presentations or maps and other pages where color is part of the information. Color printers can also be set to print only in black-and-white. Color printers are more expensive to operate since they use two ink cartridges (one color and one black ink) that need to be replaced after a certain number of pages. Users who don't have a specific need for color and who print a lot of pages will find a black-and-white printer cheaper to operate.

Resolution: Printer resolution (the sharpness of text and images on paper) is usually measured in dots per inch ( dpi ). Most inexpensive printers provide sufficient resolution for most purposes at 600 dpi.

Speed: If you do much printing, the speed of the printer becomes important. Inexpensive printers print only about 3 to 6 sheets per minute. Color printing is slower. More expensive printers are much faster.

Memory: Most printers come with a small amount of memory (for example, one megabyte ) that can be expanded by the user. Having more than the minimum amount of memory is helpful and faster when printing out pages with large images or tables with lines around them (which the printer treats as a large image).

General Categories

Serial Printers (Character Printers)
Serial printers print one character at a time moving across the paper. Electrosensitive, direct thermal, older daisy wheel and even inkjet printers could be cataloged in this group; however, the primary desktop serial printer is the serial dot matrix printer, with speeds ranging from 200 to 400 cps, which is about 90 to 180 lines per minute (lpm).

Line Printers
Line printers print a line at a time from approximately 400 to 2,000 lpm and are commonly found in datacenters and industrial environments. Earlier technologies included drum, chain, train and dot band matrix technologies. The surviving technologies use band and line matrix mechanisms.

Page Printers
Page printers print a page at a time from four to more than 800 ppm. Laser, LED, solid ink and electron beam imaging printers fall into this category. All of these printers adhere toner or ink onto a drum which is transferred to the entire page in one cycle for black and white and multiple cycles for color.

Impact Printers

Serial Dot Matrix
A desktop printer that uses a moving printhead of wire hammers. It forms characters and graphics by impacting a ribbon and transferring dots of ink onto the paper. See dot matrix printer.

Line Matrix
A type of line printer that uses an oscillating row of print hammers. The hammers form characters and graphics by impacting a ribbon and transferring dots of ink onto the paper. See line matrix printer.

Band (Line Character)
A type of line printer that uses a fixed set of characters attached to a continuously revolving metal band. A set of hammers (one for each column) hit the paper, pushing it into the ribbon and against the character image on the band. See band printer.

Earlier Impact Technologies
Impact printers were developed for the first computers, and several earlier technologies have gone by the wayside.

Chain, train and drum printers were precursors to band printers. They all used actual shaped characters, or type slugs, to print a fixed size and style of letter and digit. Daisy wheel printers were desktop impact printers used in the 1970s and 1980s. Dot band matrix printers used a combination of band printer and dot matrix methods. See chain printer, train printer, drum printer, daisy wheel and dot band matrix printer.

Non-Impact Printers

Laser & LED
Laser printers and LED printers employ the electrophotographic method used in copy machines. Both technologies are available from small desktop units to high-speed digital printing presses, ranging in speed from four to more than 700 ppm, and color units from three to 75 ppm. See laser printer, LED printer and electrophotographic.

Inkjet
Inkjets have become the most popular form of desktop personal printer, and all units print in color. Inkjets propel droplets of ink directly onto the paper. See inkjet printer.

IRIS
IRIS printers use inkjet technology, but are in a class by themselves. They achieve a perceived 1,800 dpi resolution and can print on fabric as well as paper. See IRIS printer.

Solid Ink
Solid ink printers use sticks of wax ink that are melted into a liquid. The ink is directed onto a drum, similar to a laser printer, and then transferred onto the paper to produce high-quality output. See solid ink printer.

Electron Beam Imaging
A technology somewhat similar to a laser printer, except that electricity is used to create the image instead of light. This evolved from ion deposition and is used in very high-speed page printers exceeding 800 ppm. See electron beam imaging.

Thermal Wax Transfer & Dye Sublimation
Dots of ink or dye are transferred from a ribbon onto paper by passing the ribbon and the paper across a line of heating elements. Thermal wax is used for bar code and other types of labels as well as medium-resolution graphics. Dye sublimation is used for photorealistic color output. See thermal wax transfer printer and dye sublimation printer.

Electrosensitive
A dot matrix printhead charges dots on aluminum-coated silver paper, usually in a serial fashion. The charge removes the coating, leaving a black image. See electrosensitive printer.

Direct Thermal
Used in bar code and other specialty printers as well as in earlier fax machines, dots are burned onto a type of coated paper that darkens when heat is applied to it. See direct thermal printer.

Electrostatic
Dots are charged onto a coated paper, typically a line at a time. A toner is attracted to the paper and made permanent by pressure or heat. See electrostatic plotter.

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