Wi-Fi, short for wireless fidelity refers to a set of wireless networking technologies more specifically referred to as any type of 802.11 network, 802.11b and 802.11a, dual band. The word Wi-Fi was built by an organization called the Wi-Fi Alliance. They overlook tests that confirm the production.
A product that undergoes the alliance analyses is given the name “Wi-Fi certified”. In earlier times, the term “Wi-Fi” was used only in place of the 2.4 GHz 802.11b.standard. It rapidly gained in fame with access points across the Unites States.
These standards are generally in used around the world, and allow users that have Wifi capable device, like a laptop or PDA to connect anywhere there is available Wi-Fi access point.
There are three standards referred to signify the speed of connection. Both the 802.11a and 802.11b are the ones capable of 54 MBPS with 802.11a additional capabilities.
802.11b are the most common of the three standards because it can transmit at 11 Megabits per Second even though the faster WI-Fi standards are quickly changing it. However, all these Wi-Fi standards are fast enough to generally allow a broadband connection.
Wireless Fidelity is an appearing technology that will probably be as common as electric outlets and phone lines in a few years. It adds great levels of convenience and high level of production for workers whose offices have a Wi-Fi access.
It is intentionally planned to be use for wireless devices but is now often used for Internet access. You can connect computers anywhere, in or out your home or office without needing wires. They are just connected to the network that uses radio signals. Even travelers can progressively equip Wi-Fi in airports, coffee shops, Internet cafes, malls, and hotels around the world.

How does W-Fi work?

Wi-Fi is the wireless way to handle networking. Wi-Fi allocates a worldwide Internet connection to be transmitted through radio waves. Radio waves are the ones that make Wi-Fi run and exist. They permit Wi-Fi networking occurs between many people. These waves are transmitted from antennae and Wi-Fi receivers are picking them up. The moment a device receives signal within the range of a Wi-Fi network, an Internet connection is produced without a chord and with the use of a Wi-Fi card that reads the signal. The user will be incited with login screen and password if needed once the connection is established between the user and the network.

How secure is Wi-Fi?

Wi-Fi maintains and continues to have numerous security issues. Wired Equivalent Privacy (WEP) is used in the physical and data link layers. It was planned to provide wireless security by protecting the data while it travels from one point to the other. Contrasting with the wired LANs, their networks are usually inside the building.
Even if it is protected by wireless LANs, they are more exposed due to the fact that the data travels over radio waves which are much easier to capture. One of the reasons why WEP is vulnerable, some other corporations do not even change their shared keys for a long time. The keys are too long to be used. With that much time, the key can get into other hands and use it in a wrong motive, which could be disastrous for the corporation.

A DVR card looks quite similar to the common computer video card in many PCs. However, when it comes to functioning, there are a lot of differences between them.  DVR cards come with software that can be used to display and record information from multiple cameras at the same time. These are installed in computers to allow them to function as digital video recording (DVR) systems.

DVR cards are mostly used in surveillance systems to process the information received from a source such as a camera and pass it on to a storage device like a hard disk. In such a set up, there is more than one video out port. At these ports, the output from the security cameras is plugged in to the card. Once installed inside a computer, the card becomes active and is instantly recognized by the machine thanks to the accompanying software. Once properly installed, this card allows the user to digitally record signals on to his hard drive and then view it instantaneously.

Depending on need, you can also choose the quality of storage. DVR cards frames per second (fps) ranges are 30, 60,120,240 and 480. The fps also determines the time for which recording can be done. For a hard disk having 80 GB disk space, at 30 fps one can record for 320 hours. Similarly, at 120 fps, for an 80 GB hard disk drive, one can record for up to 80 hours. If you have a 960 GB hard disk, you can record for a whopping 3840 hours at the rate of 80 fps, which translates into 160 days or nearly 5 months.

Only a limited number of cameras are supported by the old DVR cards (launched nearly two years ago). If more cameras were needed, more cards had to be installed. This led to an increase in the workload of the computer that was unable to meet the memory demand and resulted in a system crash. Modern cards come with enhanced inbuilt processing power that reduces the burden on the computer.

With unmatched features, DVR cards have come to symbolize a much needed technology intervention in the field of surveillance and monitoring. In the coming years, with advanced features, DVR cards will completely replace its conventional rival.

iPods are a great invention, however many have complained about the lack of playtime and poor battery life. Previously, replacing an iPod battery was next to impossible. So when your battery dies, its time for a new iPod. This of course proved to be extremely expensive.  As a result, manufacturers have begun producing aftermarket iPOD batteries for a DIY conscious producer. There are even high capacity batteries that will basically give you more playtime on your iPod in comparison to the original iPod batteries. An even better incentive to replace that dying battery!

I know what you’re thinking, you don’t want to rip apart that shiny iPod of yours! Aftermarket iPod batteries were designed to make the installation as simple as possible (it wasn’t really all that difficult to begin with anyway). Since the batteries installation doesn’t require any soldering, the most difficult part is opening up the physical case.  Since the iPod doesn’t contain any screws, the casing must be pried off in order to access the internal battery.  I do not recommend using a screwdriver to do this as it will damage the case. A guitar pick has been recommended to do the job, but even better, some batteries come with the non scratch nylon tools required to open your iPod safely.

Below are some instructions on how to install your battery. I am aware that there are more than one
Steps to install the battery:

• Lay your iPod on a piece of cloth o non scratch surface. Using your non scratch tools, slowly insert it under the cover and begin to pry off the cover. You should hear it begin to open. Work your way by sliding the tool all around the edges.
• The iPod is basically made of two halves. With both halves separated, put the empty shell aside.
• The other half will have all the internal components in there. You should be able to spot the battery in there. You will see that the battery is connected to the main circuit board of your iPod. Carefully unplug the old battery by pulling on the end of the connector.
• Get your new battery and plug in into the connector socket on your iPod’s circuit board. The connector will only go in one way so do make sure you insert it the right way up.
• Once it’s all connected up, put the cover back on by pressing the edges of the two halves together.
• Plug your charger in and let your new iPod charge up for at least 4 hours. All new batteries should get a longer than normal charge the first time around.
• Now you’re ready to enjoy your music once more!