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Wi-Fi Technology

Posted by Salem Alsuwaidi on

What is Wi-Fi:

Wi-Fi is a wireless networking protocol that allows devices to communicate with each other without internet cable. It's technically an industry term that represents a type of wireless Local Area Network (LAN) protocol based on the 802.11 IEEE network standard. This is an industry term which represents a type of wireless local area network (WLAN).

 

Explanation:

Within a fixed location, Wi-Fi is the most popular means of communicating data wirelessly.  From user prospective, Wi-Fi is just internet access from a wireless capable device like a phone, tablet or computer. The main requirement for Wi-Fi is that there should be a device that can transmit the wireless signal, like a router, phone or a computer. Normally in homes, there is an internet service provider (ISP) like Etisalat or du. The internet connection coming from ISP is connected with the router and the router transmits wireless signal, delivering the service to nearby devices. Another way to use Wi-Fi is a "Wi-Fi hotspot” so that a phone or computer can share its wireless internet connection just like a router. Most modern devices support Wi-Fi so that it can access a network to get internet access and share network resources.

How it Works:

Setting up Wi-Fi at home is pretty simple. You only need a wireless router and access to router’s admin management pages to configure the right settings like Wi-Fi name, password, parental control, allowing certain devices or blocking any devices etc. If the router is new and needs to be configured for the first time, it requires these steps. First connect the internet connection from ISP to the router, then provide username and password of ISP, then provide a name for the Wi-Fi and password. The devices will search for network to make the connection. If the router is dual band or tri band, you can specify two or three names for the Wi-Fi respectively.

Some devices don't have a wireless adapter built-in, in such case you can buy your own Wi-Fi USB adapter. You can also share your internet connection with other devices to create a wireless Hotspot from your computer. 

Operation:


It operates at much higher frequencies, and consumes more power. Many smart home products don’t use Wi-Fi-connectivity because it would require their devices to have a dedicated power source or a long-lasting battery. Thats the reason  most Wi-Fi webcams aren’t wireless.

Concerns:

Wi-Fi commonly uses 2.4 Gigahertz and 5 Gigahertz frequency which is greater than Bluetooth, Z-wave and zigbee. It is not reliable in case of Home Automation although it is easy to implement in any consumer product.
Wi-Fi has no physical connections and is more vulnerable to attack compared with wired connections such as Ethernet. Some products related to Wi-Fi are given below.

 
Linksys Dual Band Wireless Router

Linksys 8 Port Network Switch

Access point:

Access point is an important element in Wi-Fi technology. To connect to an access point, devices must be equipped with wireless network adapters. It can be used to provide internet to the devices that are within the range of wireless network. The coverage of one or more interconnected access points can extend from an area as small as a few rooms to as large as many square kilometers. For coverage in the larger area may require a group of access points with overlapping coverage.

 
Wi-Fi Access Point Wi-Fi Access Point

Normally, an access point has a range of about 20 meters indoors and a greater than 20 in outdoors.

Supported Devices:

Wi-Fi is supported by many applications and devices including video game consoles, home networks, mobile phones, operating systems, and a lot of other consumer electronics.

Biggest Edge:

Since the bandwidth of Wi-Fi is largeer, Wi-Fi network probably sends and receives large chunks of data around the home and also giant email attachments, streaming audio and video, and all of the two-way data sent and received by multiplayer video games. Other Wireless technologies can't such large amount of data in little time.

Wi-Fi Alliance:

Wi-Fi Alliance is the worldwide network of companies that brings the Wi-Fi. Wi-Fi Alliance defines innovative, standards-based Wi-Fi technologies and programs, certifies products that meet quality, performance, security, and capability standards, provides industry thought leadership, and advocates globally for fair spectrum rules.

Applications:

1) Acces to internet without any cable:

Wi-Fi is used for free at restaurants or coffee houses , It sends out Data to LAN and WANS network and these networks allow any connection without using cords , You can take your laptop where ever you want with the option of having a wireless connection with the help of the routers and the adapters .


2) Hotpsot from cell phones:

Hotspots are connected through Wi-Fi , The cell phone companies are supported by GSM. It allows people to always stay connected through Wi-Fi , So it can be used for emergencies .

3) More Secure than other wireless technologies: 

Wi-Fi network provides both security ( you can control who connects ) , and privacy ( the transmissions cannot be read by others ) for communications as they travel across your network , and for maximum security, your network should include only devices with the latest in security technology .

4) Use in Home Automation:

Wi-Fi can also be used in home automation. It provides medium to travel commands to thermostats, light bulbs, home security , monitoring and control systems , the appliances , and the automotive products.

Specifications:

Operating Frequency:

2.4 GHz under 802.11b and 802.11g,

5 GHz under 802.11a

Maximum Data Speed:

11 Mbps, using the 802.11b

54 Mbps, using the 802.11a or 802.11g

 

Average Data Speed:

 

5.5 Mbps, using the 802.11b

20 Mbps, using the 802.11a or 802.11g
Network Typologies: Star and point to point
Indoor Range: 46 meters
Outdoor Range: 92 meters
Founded- Union: Wi-Fi alliance
Main Application: Simplified access to internet
Power Consumption: 6 watts

 


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