Wi-Fi Cards
A wireless fidelity (Wi-Fi) card is a type of Local Area Network (LAN) card that can be used to access the Internet. Wi-Fi cards have built in wireless radios and antennas that can be used both indoors and outdoors using infrared waves for data transmission. Wi-Fi cards are also known as wireless Internet cards and come standard on many notebook computers. Many store and restaurant locations are beginning to offer free wireless Internet to customers.
Wi-Fi enabled devices can broadcast and receive network connections without the need of a physical network connection. Wireless communication offers various utilities. You might want to configure printers, speakers, or entertainment devices to be compatible with your wireless network. You may also want to play online radio, download songs, send e-mail, and transfer files. With Wi-Fi cards, you can access the Internet without wires, and you can enhance your productivity while you are mobile.
How It Works
Wi-Fi cards come in several forms. There are Wi-Fi cards for laptop computers, desktop computers, and personal digital assistants. These days, many computers come with Wi-Fi cards preinstalled. Different types of Wi-Fi cards need to be installed for different devices. You can install a PCI card for a desktop computer and a PMCIA Wi-Fi card for a laptop.
When you connect your system to a wireless network connection, your computer sends the necessary data, files, or request to the Wi-Fi card. The Wi-Fi router or access point translates binary data into radio waves. These radio waves are broadcasted into the surrounding area. Wireless signals can generally travel a distance of 75 feet to 150 feet. If there are no obstacles, the signal can even travel up to a mile. Wi-Fi cards pick up radio waves using tiny antennas. The Wi-Fi card then converts the signal back to binary format in order to display the web page on your system
Companies/Brands
Motorola and Linksys by Cisco are two companies that manufacture and sell Wi-Fi cards.Call For Price
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Webcams
Overview
A webcam is a video camera that attaches to a computer to record video. You can even use a webcam to stream video over the Internet. The term webcam also describes low resolution digital cameras that are exclusively designed for video messaging and video conferencing. Web cams can also record non- real time events. They can connect to your PC through a USB port or wirelessly. Many computers come with built in webcams as well.
Webcams are available for a variety of purposes. There exist personal webcams, traffic webcams, private webcams, business webcams, and other unique webcams that broadcast video online at any time. Webcams are widely used for traffic information, travel promotion, and the remote visualization of any on-going events.
There are two types of broadcast webcams. The first streams images by taking constant pictures and converting them into video format. The second is through Java, which captures and refreshes images at permanent time intervals. It is the broadcasting tool (the camera) that is connected to the computer.How It Works
The operation of a webcam is very similar to that of a digital camera, it captures the light through a small lens at the front using a tiny grid of light detectors known as a CCD (charged coupled device) and converts the picture in the front of camera to a digital format. Certain USB support devices read the image from the sensor and transmit it to the host computer. The sensor and support devices are built on a single silicon chip in order to save space. The USB video device class (UVC) specification gives you the freedom to connect a webcam to a computer directly without the aid of proprietary driver. The images captured from the webcam are copied into your website through an FTP upload.
Companies/Brands
Creative and Logitech offer a wide range of webcams.
Wireless Routers
Overview
A wireless router performs the functions of a router and a wireless access point. This device determines the network point to which a packet of data should be forwarded to reach its destination. Wireless routers are devices that are capable of connecting one computer or an entire network to another computer or another entire network. Wireless routers allow you to access a network or Internet without the use of cables. These routers are only used to connect computers, media players, game consoles, and printers.
Wireless routers are usually available at prices beginning at $95. The cost of the router varies depending on your brand, security preferences, and network needs.
How It Works
These routers function in the same way as a wireless phone. They are hooked up to a cable or a Digital Subscriber Line (DSL) Internet connection and use radio frequency waves instead of telephone lines to transmit and receive signals. After receiving the signal, the wireless router decodes it and sends the data to the Internet. It can also receive data from web and transform it into a radio signal and then send it to the computer. Service Set Identifier (SSID) and Wireless Equivalent Privacy (WEP) improve the security and speed of wireless Internet access.
Wireless routers require at least two networks for a router to connect. They are commonly used to connect Local Area Networks (LANs) or Wide Area Networks (WANs) or a LAN and its Internet Service Provider (ISP) network. All wireless routers have a port that connects to a DSL or cable modem and an integrated switch that facilitates a network connection.
As a connector device, routers are positioned at gateways where two or more networks are connected. These routers uses headers and tables determine the best path for transferring data packets among networks. They use protocols such as Internet Control Message Protocol (ICMP) to communicate with one other and thus configure the best route for data transfer between hosts.
Companies/Brand
NetGear, Belkin, CISCO, and D Link manufacture wireless routers.
DSL Modems
Overview
A Digital Subscriber Line (DSL) is a type of broadband Internet service. It provides faster Internet access and is exclusively designed for usage with high-speed connections. DSL connections use frequencies from 25 kHz to above 1 MHz for Internet access. You can talk on the phone and access the Internet simultaneously, since DSL modems use a filter to keep data signals secure and to prevent interference with regular phone calls. A DSL modem can be connected to the computer through an Ethernet port or through a Universal Serial Bus (USB).
You can set up your Local Area Network (LAN) to access the Internet through the same DSL modem using Ethernet cables. Modems can range in cost between $29 and $1,399, depending on your bandwidth and technology needs. An Internet service provider (ISP) may rent out or waive the cost of a modem
How It Works
Your DSL modem gives you the technology to access the Internet through a DSL service provider. First, you should select a service provider. Your ISP might give you a DSL modem, or you will need to purchase your own. Make sure that your modem comes with a power supply, and Ethernet cable. If you have multiple computers or a network, you will also need a router. One computer can access the Internet directly through a DSL modem.
There are two forms of DSL: an Asymmetric Digital Subscriber Line (ADSL) and a Synchronous Digital Subscriber Line (SDSL). DSL technology allows both upstream and downstream traffic. Small companies and home users generally use ADSL for Internet access. ADSL typically has slower upstream speeds and faster downstream speeds. Larger companies prefer SDSL since they need to send and receive large amounts of information. SLS upload and download speeds are the same, and with ADSL, download speeds are much faster. Your overall speed will vary based on the plan that you purchase.
Companies/Brands
Companies including NetGear, D-Link, and EngNet manufacture DSL modems
CAT 5E Cables
Overview
Category 5 (CAT 5E) cables are able to carry high signals reliably. They contain either two or four pairs of copper wire and they can reach a maximum of about 330 feet in length. They have two conductors, a forward and a return, in a single circuit.
A CAT 5 cable is also known as an Ethernet network cable that utilizes two pairs of twisted copper wires. Many of these cables are unshielded and rely on the twisted pair design for noise rejection. CAT 5 cables support data transfer speeds of up to 1000 Mbps. CAT 5E cables support voice services, token ring networks, and ATMs.
CAT 5E cables are improved CAT 5 cables. They are held to a higher performance standard, but they do not increase the length of a local area network (LAN)
How It Works
CAT 5 and CAT 5E cables are either solid or stranded. Solid cables can be longer in length and are best for wiring configurations that are unlikely to change. Stranded cables are better for settings that are continuously changing.
You can purchase these cables in bulk and cut them down to the length that you need. Once cut, you can attach these cables to RJ-45 connectors. You can choose from a variety of colors and sizes to match your environment. You can also coordinate colors to avoid confusion. You can buy CAT 5E cables at hardware stores and electronics stores, and you can configure them to your network's needs.
Companies/Brand
Optimized and Philips manufacture CAT 5E cables in various lengths and colors
