Wireless networking has become one of the fastest growing trends in the home computer market. The latest complete standard, 802.11n (or “wireless-N”), is capable of speeds faster than many wired networks and has better range and reliability than its predecessors. However, a replacement standard called 802.11ac (or “wireless-AC”) is already on the drawing board and some manufacturers have even released products using the incomplete standard.
802.11ac, expected to have final approval in 2013, improves upon many of the new technologies that debuted in the 802.11n standard. Wireless-N typically connects at speeds up to 150Mbps, with some higher end devices capable of an impressive 300Mbps or even 450Mbps. However, wireless-AC promises to triple those speeds so the lower end devices using wireless-AC will be as fast as the highest-end devices using the current 802.11n standard and the higher end devices will be able to outperform today’s fastest wired connections. While wireless-N is already fast enough for most current network needs, including streaming HD video, the 802.11ac standard promises to allow even higher quality media to be streamed to multiple devices at the same time.
In addition to huge speed increases, the new standard also promises better range and reliability. Although the overall technology behind it is complex, there are two features of 802.11ac that make the biggest difference. Firstly, wireless-AC will use the 5GHz wireless spectrum, which helps to avoid interference with wireless phones and many other devices (including older wireless-G and wireless-B networks) that use the 2.4GHz frequency.
let’s know about fiber optics
Fiber optics is a type of transmission line or cable is made of glass or plastic is very smooth and smaller than a hair, and can be used to transmit light signals from one place to another. The light source used is usually a laser or LED. This cable is approximately 120 micrometers in diameter. Light that is in the optical fiber does not come out because the refractive index of glass is greater than the refractive index of air, because the laser has a very narrow spectrum. Speed optical fiber transmission is very high so it is great to use as a communication channel. The efficiency of the optical fiber is determined by the purity of the building blocks of glass / glass. The more pure glass material, the less light is absorbed by the fiber optics.
Structure of Fiber Optics
Broadly speaking, the structure of the optical fiber is divided into two parts, namely core and cladding (wrapping of the core). Caldiing have a function to protect the light that bounces off the core leads out to be reflected back into the core. Cladding can reflects the light from the core that leads out because the cladding have a lower refractive index.
In fact the optical fiber is also wrapped in a layer called resin-called jacket. This resin layer can absorb the light so as to prevent leakage that leads out of the core.
Types of Optical Fiber
Broadly speaking, the distribution of types of optical fibers can be seen from two aspects, namely based on the propagated mode and based on the core refractive index.
a. Based on the propagated mode optical fiber can be divided into two general categories:
Cikaso Waterfall – Indonesia
Cikaso waterfall is a dramatic waterfall on the Cikaso River in Western Java.
The Cikaso waterfall is on the Cikaso River, which originates in North Sukabumi and flows south to the Surade District in South Sukabumi. It lies in the Ujung tourist area between Jampang Kulon and Surade. The waterfalls have a height of almost 80 metres (260 ft), with three parallel drops along cliffs that are about 100 feet (30 m) wide. The falls are accessible from the Ciniti, Cibitung village in the Cibitung Kulon sub-Jampang. They can be reached by foot or by motor boat.
article source: wikipedia
Google’s secure data centers are some of the most energy efficient in the world. Each year we save millions of dollars on energy costs, and we use renewable energy whenever we can.
Lets see the from original page : http://www.google.com/about/datacenters/