sushrukh
08-07-2007, 09:24 AM
So, another guide from me.Hope you find it useful.:smile::icon_tiphat:
Wireless solutions are beginning to pick up in every contry.
Here is a lowdown on what options exist in order to go wirefree.
Wireless devices are redefining the word “mobility.” Laptops were the forerunners of the mobility theme, and wireless devices are taking it to the next level. The long-cherished dream of pervasive computing now feels closer to home.While wireless devices were around long enough, it was only after the introduction of Intel’s Centrino platform that it caught on to the imagination of mainstream industry
bigwigs.
Intel’s Centrino is a platform comprising of a CPU, a chipset and a wireless device,all bundled together in a nifty laptop. But there is more to the Centrino than just a laptop—it is a complete platform created from the ground up for mobile computing.
The wireless entity in this platform enables you to access your data anyplace anytime, provided the right infrastructure is there. “Infrastructure” here denotes specific locations where you can connect wirelessly to a device connected to the Internet.
Such locations are called hotspots, and the device to which you connect are the access points. This complete eco-system, when ready,allows you to access your mails, data etc. from almost any place such as airports, bus stops,restaurants, your bed etc—and that, without messy wire connections.
On the software end, these devices automatically recognise each other’s presence,and do the necessary settings required for smooth connection.For setting up a wireless environment,Access Points, or APs as they are called, and PCMCIA / PCI cards are the most basic devices required. Depending upon the standards they employ, such devices are categorised as 802.11a, 802.11b and 802.11g.
Introduction To The 802.11 Standards
In 1997, the Institute of Electrical and Electronics Engineers (IEEE) created the first WLAN (wireless LAN) standard. They called it 802.11, after the name of the group that oversaw its development. Unfortunately, 802.11 supported a maximum bandwidth of only 2 Mbps, which was too slow for most applications.
802.11b
The IEEE expanded on 802.11 in July 1999,creating the 802.11b specification. 802.11b supports bandwidths of up to 11 Mbps, comparable to Ethernet.
802.11b uses the same radio signalling frequency—2.4 GHz—as the original 802.11 standard. Being an unregulated frequency,802.11b devices can incur interference from microwave ovens, cordless phones, and other appliances using the 2.4 GHz range.
802.11a
When 802.11b was developed, the IEEE created a second extension to the 802.11 standard,called 802.11a. Due to its higher cost, 802.11a fits in well with the business market, whereas 802.11b serves the home market better.802.11a supports a maximum bandwidth of up to 54 Mbps and signals in a regulated 5 GHz range.
The higher frequency means the range of 802.11a is more limited. It also means 802.11a signals have more difficulty penetrating walls and other obstructions. Because 802.11a and 802.11b utilise different frequencies, the two technologies are incompatible
with each other.
802.11g
In 2002 and 2003,WLAN products supporting a new standard called 802.11g began to appear.802.11g attempts to combine the best of both 802.11a and 802.11b. 802.11g supports bandwidths of up to 54 Mbps, and it uses the 2.4 GHz frequency for greater range. 802.11g is backwards compatible with 802.11b.
Trends
Wireless Lan (WLAN) is primarily a platform for data transmission without use of a solid state media.Here one is essentially referring to IEEE 802.11 (a, b, g, i, etc.) standards.The WLAN market is to a large extent driven by the market for laptops and the penetration rate of laptops vs. desktops would define the extent to which WLANs are being deployed.
In my country,the penetration of PCs into homes is much lower compared to its presence in Business Environments.Simultaneously, it is most inconceivable to imagine that we would see a large number of homes having two PCs for some time.Hence, here, wireless deployments are mainly in enterprises.
Other drivers for WLANs are scenarios like rented office space premises that may need to be shifted, or Cyber-Cafes, or deployments in the hospitality industry. Besides the above,there are a few niche applica-tions such as RFID (Radio Frequency Identification) checks, industrial applications requiring the noting down of reading from various sensors, and real-time status monitoring in hospitals.
VoIP (Voice over Internet Protocol), when it first came, was heralded as a system that would reduce the cost of communications drastically, and research organisations redicted/anticipated that all phones would be based on VoIP.
but this has happened only partially.True, VoIP has significantly helped in reduction of costs and thus prices, and enabled many smaller players to enter the normally very capital intensive area of telecom, yet on the other hand, one does not really find may telephone services being deployed completely on VoIP. One sees VoIP either being deployed by the carriers (on their back-end) or being used through dial-up IP phones or used within organisations for their internal communications on VPNs or Leased Circuit Networks.
VoIP over Wireless is essentially a tool to enable seamless deployments of VoIP within the organisation. It is a solution offered today by quite a few vendors and is constantly improving. One could even have these services deployed in homes as the last mile, but here one would need to have broadband as the base service on which one would deploy VoIP though Wireless.
The main market barriers for VoWLAN are existing network infrastructure and operating devices. These will have to be replaced with VoWLAN-compliant products, affecting the current projected revenues of mobile phone carriers and telephone operators. This makes it difficult to predict if telecom service providers will encourage or hamper the deployment for VoWLAN.
WLAN will remain in use mostly for data transmission in the next 4years. But usage of VoWLAN offshoots such as WiFi phones,PDAs or notebook PCs with built-in voice functions for home and office users has increased notably in 2007 (worldwide).
IEEE 802.11n
IEEE 802.11n is a proposed amendment to the IEEE 802.11-2007 (http://en.wikipedia.org/wiki/IEEE_802.11-2007) wireless networking (http://en.wikipedia.org/wiki/Wireless_network) standard to significantly improve network throughput over previous standards, such as 802.11b (http://en.wikipedia.org/wiki/802.11b) and 802.11g (http://en.wikipedia.org/wiki/802.11g), with many experts claiming that this wireless technology's potential 248 Mbit (http://en.wikipedia.org/wiki/Mbit)/s data rate will finally allow consumers to move beyond traditional wired ethernet (http://en.wikipedia.org/wiki/Ethernet) LANs (http://en.wikipedia.org/wiki/Local_area_network).
-----------------------------------------------------------------
:smile::icon_tiphat:
Wireless solutions are beginning to pick up in every contry.
Here is a lowdown on what options exist in order to go wirefree.
Wireless devices are redefining the word “mobility.” Laptops were the forerunners of the mobility theme, and wireless devices are taking it to the next level. The long-cherished dream of pervasive computing now feels closer to home.While wireless devices were around long enough, it was only after the introduction of Intel’s Centrino platform that it caught on to the imagination of mainstream industry
bigwigs.
Intel’s Centrino is a platform comprising of a CPU, a chipset and a wireless device,all bundled together in a nifty laptop. But there is more to the Centrino than just a laptop—it is a complete platform created from the ground up for mobile computing.
The wireless entity in this platform enables you to access your data anyplace anytime, provided the right infrastructure is there. “Infrastructure” here denotes specific locations where you can connect wirelessly to a device connected to the Internet.
Such locations are called hotspots, and the device to which you connect are the access points. This complete eco-system, when ready,allows you to access your mails, data etc. from almost any place such as airports, bus stops,restaurants, your bed etc—and that, without messy wire connections.
On the software end, these devices automatically recognise each other’s presence,and do the necessary settings required for smooth connection.For setting up a wireless environment,Access Points, or APs as they are called, and PCMCIA / PCI cards are the most basic devices required. Depending upon the standards they employ, such devices are categorised as 802.11a, 802.11b and 802.11g.
Introduction To The 802.11 Standards
In 1997, the Institute of Electrical and Electronics Engineers (IEEE) created the first WLAN (wireless LAN) standard. They called it 802.11, after the name of the group that oversaw its development. Unfortunately, 802.11 supported a maximum bandwidth of only 2 Mbps, which was too slow for most applications.
802.11b
The IEEE expanded on 802.11 in July 1999,creating the 802.11b specification. 802.11b supports bandwidths of up to 11 Mbps, comparable to Ethernet.
802.11b uses the same radio signalling frequency—2.4 GHz—as the original 802.11 standard. Being an unregulated frequency,802.11b devices can incur interference from microwave ovens, cordless phones, and other appliances using the 2.4 GHz range.
802.11a
When 802.11b was developed, the IEEE created a second extension to the 802.11 standard,called 802.11a. Due to its higher cost, 802.11a fits in well with the business market, whereas 802.11b serves the home market better.802.11a supports a maximum bandwidth of up to 54 Mbps and signals in a regulated 5 GHz range.
The higher frequency means the range of 802.11a is more limited. It also means 802.11a signals have more difficulty penetrating walls and other obstructions. Because 802.11a and 802.11b utilise different frequencies, the two technologies are incompatible
with each other.
802.11g
In 2002 and 2003,WLAN products supporting a new standard called 802.11g began to appear.802.11g attempts to combine the best of both 802.11a and 802.11b. 802.11g supports bandwidths of up to 54 Mbps, and it uses the 2.4 GHz frequency for greater range. 802.11g is backwards compatible with 802.11b.
Trends
Wireless Lan (WLAN) is primarily a platform for data transmission without use of a solid state media.Here one is essentially referring to IEEE 802.11 (a, b, g, i, etc.) standards.The WLAN market is to a large extent driven by the market for laptops and the penetration rate of laptops vs. desktops would define the extent to which WLANs are being deployed.
In my country,the penetration of PCs into homes is much lower compared to its presence in Business Environments.Simultaneously, it is most inconceivable to imagine that we would see a large number of homes having two PCs for some time.Hence, here, wireless deployments are mainly in enterprises.
Other drivers for WLANs are scenarios like rented office space premises that may need to be shifted, or Cyber-Cafes, or deployments in the hospitality industry. Besides the above,there are a few niche applica-tions such as RFID (Radio Frequency Identification) checks, industrial applications requiring the noting down of reading from various sensors, and real-time status monitoring in hospitals.
VoIP (Voice over Internet Protocol), when it first came, was heralded as a system that would reduce the cost of communications drastically, and research organisations redicted/anticipated that all phones would be based on VoIP.
but this has happened only partially.True, VoIP has significantly helped in reduction of costs and thus prices, and enabled many smaller players to enter the normally very capital intensive area of telecom, yet on the other hand, one does not really find may telephone services being deployed completely on VoIP. One sees VoIP either being deployed by the carriers (on their back-end) or being used through dial-up IP phones or used within organisations for their internal communications on VPNs or Leased Circuit Networks.
VoIP over Wireless is essentially a tool to enable seamless deployments of VoIP within the organisation. It is a solution offered today by quite a few vendors and is constantly improving. One could even have these services deployed in homes as the last mile, but here one would need to have broadband as the base service on which one would deploy VoIP though Wireless.
The main market barriers for VoWLAN are existing network infrastructure and operating devices. These will have to be replaced with VoWLAN-compliant products, affecting the current projected revenues of mobile phone carriers and telephone operators. This makes it difficult to predict if telecom service providers will encourage or hamper the deployment for VoWLAN.
WLAN will remain in use mostly for data transmission in the next 4years. But usage of VoWLAN offshoots such as WiFi phones,PDAs or notebook PCs with built-in voice functions for home and office users has increased notably in 2007 (worldwide).
IEEE 802.11n
IEEE 802.11n is a proposed amendment to the IEEE 802.11-2007 (http://en.wikipedia.org/wiki/IEEE_802.11-2007) wireless networking (http://en.wikipedia.org/wiki/Wireless_network) standard to significantly improve network throughput over previous standards, such as 802.11b (http://en.wikipedia.org/wiki/802.11b) and 802.11g (http://en.wikipedia.org/wiki/802.11g), with many experts claiming that this wireless technology's potential 248 Mbit (http://en.wikipedia.org/wiki/Mbit)/s data rate will finally allow consumers to move beyond traditional wired ethernet (http://en.wikipedia.org/wiki/Ethernet) LANs (http://en.wikipedia.org/wiki/Local_area_network).
-----------------------------------------------------------------
:smile::icon_tiphat: