What is TCP/IP (Transmission Control Protocol/Internet Protocol)? - Definition from WhatIs. Short Film “Sight” Shows Us The Dark Side Of Project Glass-Like Technology. Much of the talk around the tech world recently has been focused on Project Glass – aka Google Glasses – the wearable heads of display that many think could revolutionize the way we interact with apps, photos, video, and really the internet in general. But Google’s not the only company that’s dying to put a computer on your face. Even Apple seems to have joined the fray, recently patenting their own little version of Google Glasses. It definitely feels like this type of technology is the future, as companies everywhere are rushing to get in on the ground floor. But before we go turning everyone’s life into one giant computer interface – should we pause and think of what could happen in the not-so-distant future…if things took a turn for the darker side?
At first, this type of technology will come in the form of glasses. Then, perhaps, contact lenses. This amazing short film from Eran May-raz and Daniel Lazo takes it a step further. Check out “Sight” below: How Routers Work" Ipexpress. Five Best Home Wi-Fi Routers. Wireless Earbuds For iPod. If you are looking for wireless earbuds for your iPod maybe this article will make you decide which earbuds are good for you.
This wireless earduds are perfect if you want to run in a park or any other sport activates because you can listen to your favorite music without cord or wires. <-300x250 Medium Rectangle - center-> If you are looking for wireless earbuds you should know that there are 2 types: the ones that connect directly to your iPod and the ones that connect to your iPod through an iPod adapter. Most of the wireless earbuds for iPod use the Bluetooth protocol to connect to your iPod and some of them use other wireless protocol. The fist wireless earbuds we are going to present are the Sennheiser MX W1 Totally Wireless Earphones.
This earbuds don’t connect directly to your iPod and they come with a small transmitter that connects to your player. You can find the Sennheiser MX W1 Totally Wireless Earphones on amazon.com at a price of $499.95. Polk Audio UltraFit 500 headphones. Polk Audio, one of the classic manufacturers of high-end room speakers, have taken their first step into headphone-land with their recent UltraFit line of sports headphones. The ergonomic fit of some exercise-specific headphones can sometimes be difficult and too often we find the earpieces won't stay correctly in the ears when actively exercising and jumping about. While the fit design of the UltraFit 500 doesn't technically fall too far outside of "difficult", once you figure it out, they'll fit very securely and feel like they would stay perfectly in place through even the most aggressive of work-outs.
The earpiece fit into the ear is fairly shallow which allows you to remain at least somewhat aware of your ambient environs when jogging city streets, for example. The overall fit ergonomics remain very stable due to the flexible ear loops securing the headphones to your noggin. Best Headphones For Running and Exercise- 2011 Gear Guide. Best Headphones for Indoor or Outdoor Exercise Anyone who hits the gym or runs knows that awesome music is a huge asset to any exercise routine. After all, nothing can get you motivated for a hard workout quite like your favorite tunes. When choosing your 'sport' headphones, it's important to consider where you'll be listening -- indoors or outdoors. Indoor exercise at gym or home is typically best done with good in-ear headphones or closed headphones which can isolate at varying levels from ambient noise and distractions.
You also won't need to turn up the volume to hear the music very clearly. However, if running, walking or cycling outdoors, you'll need 'open-back' headphones, such as an 'on-ear' earpad style, that allows you to hear traffic and other potential hazards. Best Headphones for the Gym In ear headphones are excellent for workouts since they can isolate you from all the ambient gym noise and distractions. Best Headphones for Running or Jogging. Hands-on with Sennheiser MX W1 wireless earbuds. First Wireless Ear-buds. Wireless earbuds. JayBird uSport Bluetooth Adapter for 3.5mm Devices - Bluetooth Headset - Retail Packaging - Black: Cell Phones & Accessories. Jaybird Freedom Stereo Bluetooth Earbuds with Secure Fit-Bluetooth Headset - Retail Packaging - Midnight Black: Cell Phones & Accessories.
Sony Ericsson Wireless Stereo Headphone - Black: Cell Phones & Accessories. Administrative Division of New Zealand: Districts and Cities - Statistics & Maps on City Population. ISM band. The industrial, scientific and medical (ISM) radio bands are radio bands (portions of the radio spectrum) reserved internationally for the use of radio frequency (RF) energy for industrial, scientific and medical purposes other than telecommunications.[1] Examples of applications in these bands include radio-frequency process heating, microwave ovens, and medical diathermy machines.
The powerful emissions of these devices can create electromagnetic interference and disrupt radio communication using the same frequency, so these devices were limited to certain bands of frequencies. In general, communications equipment operating in these bands must tolerate any interference generated by ISM equipment, and users have no regulatory protection from ISM device operation. Despite the intent of the original allocations, and because there are multiple allocations, in recent years the fastest-growing uses of these bands have been for short-range, low power communications systems. ISM bands[edit] Wi-Fi. Wi-Fi, also spelled Wifi or WiFi, is a technology that allows an electronic device to exchange data or connect to the internet wirelessly using 2.4 GHz UHF and 5 GHz SHF radio waves. The name is a trademark name, and was stated to be a play on the audiophile term Hi-Fi. The Wi-Fi Alliance defines Wi-Fi as any "wireless local area network (WLAN) products that are based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards".[1] However, since most modern WLANs are based on these standards, the term "Wi-Fi" is used in general English as a synonym for "WLAN".
Only Wi-Fi products that complete Wi-Fi Alliance interoperability certification testing successfully may use the "Wi-Fi CERTIFIED" trademark. Depiction of a device sending information wirelessly to another device, both connected to the local network, in order to print a document. Wi-Fi can be less secure than wired connections (such as Ethernet) because an intruder does not need a physical connection. IEEE 802.11. IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communication in the 2.4, 3.6, 5 and 60 GHz frequency bands. They are created and maintained by the IEEE LAN/MAN Standards Committee (IEEE 802).
The base version of the standard was released in 1997 and has had subsequent amendments. The standard and amendments provide the basis for wireless network products using the Wi-Fi brand. While each amendment is officially revoked when it is incorporated in the latest version of the standard, the corporate world tends to market to the revisions because they concisely denote capabilities of their products. As a result, in the market place, each revision tends to become its own standard. The LinksysWRT54G contains a router with an 802.11b/g radio and two antennae General description[edit] History[edit] 802.11 technology has its origins in a 1985 ruling by the U.S. Protocol[edit] 802.11b[edit] Frequency allocation. United States radio spectrum frequency allocations chart as of 2011 United States radio spectrum frequency allocations chart as of 2003 Use of radio frequency bands of the electromagnetic spectrum is regulated by governments in most countries, in a Spectrum management process known as frequency allocation or spectrum allocation.
Radio propagation does not stop at national boundaries. Giving technical and economic reasons, governments have sought to harmonise the allocation of RF bands and their standardization. A number standards bodies work on standards for frequency allocation, including: These standards bodies have assigned frequency bands in three types of allocation: High-demand sections of the electromagnetic spectrum may sometimes be allocated through auctions. Daily impact[edit] Every day, users rely on allocation of frequencies for efficient use of such devices as: Power levels vary widely (from 1 milliwatt in a Bluetooth node to 1 kilowatt in a microwave oven).
The Americas, Region 1. Bluetooth. Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz[2]) from fixed and mobile devices, and building personal area networks (PANs). Invented by telecom vendor Ericsson in 1994,[3] it was originally conceived as a wireless alternative to RS-232 data cables.
It can connect several devices, overcoming problems of synchronization. Bluetooth is managed by the Bluetooth Special Interest Group (SIG), which has more than 19,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics.[4] Bluetooth was standardized as IEEE 802.15.1, but the standard is no longer maintained. Name and logo[edit] Bluetooth logo The Bluetooth logo is a bind rune merging the Younger Futhark runes (Hagall) (ᚼ) and (Bjarkan) (ᛒ), Harald's initials.
Implementation[edit] Bluetooth operates in the range of 2400–2483.5 MHz (including guard bands). Uses[edit] Bluetooth vs. Fixed wireless. Fixed wireless is the operation of wireless devices or systems used to connect two fixed locations (e.g., building to building or tower to building) with a radio or other wireless link, such as laser bridge.[1] Usually, fixed wireless is part of a wireless LAN infrastructure. The purpose of a fixed wireless link is to enable data communications between the two sites or buildings. Fixed wireless data (FWD) links are often a cost-effective alternative to leasing fiber or installing cables between the buildings.
Antennas[edit] Fixed Wireless Antenna Fixed wireless services typically use a directional radio antenna on each end of the signal (e.g., on each building). These antennas are generally larger than those seen in Wi-Fi setups and are designed for outdoor use. Fixed Wireless Broadband[edit] With the growing infrastructure of the GSM wireless networks, fixed wireless has also become a viable solution for broadband access.
See also[edit] References[edit] Electromagnetic interference at 2.4 GHz. Electromagnetic interference at 2.4 GHz can affect various devices. This article details the different users of the 2.4 GHz band, how they cause interference to other users and how they are prone to interference from other users. Phone[edit] Many cordless telephones and baby monitors in the United States and Canada use the 2.4 GHz frequency, the same frequency at which Wi-Fi standards 802.11b, 802.11g and 802.11n operate. This can cause a significant decrease in speed, or sometimes the total blocking of the Wi-Fi signal when a conversation on the phone takes place.
The last will sometimes not be successful, as numerous cordless phones use a feature called Digital Spread Spectrum. Bluetooth[edit] Bluetooth devices intended for use in short-range personal area networks operate from 2.4 to 2.4835 GHz. Car alarm[edit] Certain car manufacturers use the 2.4 GHz frequency for their car alarm internal movement sensors. Microwave oven[edit] Video devices[edit] Wi-Fi networks[edit] EIRP[edit] Electromagnetic interference. Electromagnetic interference in analog TV signal EMI can be intentionally used for radio jamming, as in some forms of electronic warfare, or can occur unintentionally, as a result of spurious emissions for example through intermodulation products, and the like. It frequently affects the reception of AM radio in urban areas. It can also affect cell phone, FM radio and television reception, although to a lesser extent. Types[edit] Narrowband EMI or RFI interference typically emanates from intended transmissions, such as radio and TV stations or cell phones.Broadband EMI or RFI interference is unintentional radiation from sources such as electric power transmission lines. [3][4][5] Conducted electromagnetic interference is caused by the physical contact of the conductors as opposed to radiated EMI, which is caused by induction (without physical contact of the conductors).
Susceptibilities of different radio technologies[edit] Interference to consumer devices[edit] History[edit] Standards[edit] Firewall (computing) An illustration of where a firewall would be located in a network. In computing, a firewall is a software or hardware-based network security system that controls the incoming and outgoing network traffic by analyzing the data packets and determining whether they should be allowed through or not, based on applied rule set. A firewall establishes a barrier between a trusted, secure internal network and another network (e.g., the Internet) that is not assumed to be secure and trusted.[1] Firewall technology emerged in the late 1980s when the Internet was a fairly new technology in terms of its global use and connectivity.
The predecessors to firewalls for network security were the routers used in the late 1980s:[3] The first paper published on firewall technology was in 1988, when engineers from Digital Equipment Corporation (DEC) developed filter systems known as packet filter firewalls. Packet filters act by inspecting the "packets" which are transferred between computers on the Internet. Proxy server. Communication between two computers (shown in grey) connected through a third computer (shown in red) acting as a proxy.
Note that Bob doesn't know whom the information is going to, which is why proxies can be used to protect privacy. Types of proxy[edit] A proxy server may reside on the user's local computer, or at various points between the user's computer and destination servers on the Internet. Forward proxies[edit] A forward proxy taking requests from an internal network and forwarding them to the Internet. Forward proxies are proxies in which the client server names the target server to connect to.[2] Forward proxies are able to retrieve from a wide range of sources (in most cases anywhere on the Internet). The terms "forward proxy" and "forwarding proxy" are a general description of behavior (forwarding traffic) and thus ambiguous.
Open proxies[edit] An open proxy forwarding requests from and to anywhere on the Internet. Reverse proxies[edit] Uses of proxy servers[edit] Translation[edit] Tech Know: CHoosing an e-reader. Technology continues to advance day after day to become one of the most important aspects of a person's life. Get tips on tech and learn about choosing better equipment from eHow's Tech Know. Choosing an E-Book Reader A good E-Book reader will allow you to take not just your favorite book but your entire collection with you wherever you go.
Get tips on choosing an E-Book reader with help from an expert in this free video clip. Take Better Smart Phone Photos Just because your smart phone has a great camera doesn't mean you can expect every last picture to come out perfect. Selecting a Cell Phone Plan That Meets Your Needs Choosing a cell phone plan that works for you requires careful consideration for both budget and features. What You Need in a Digital Camera Picking the right digital camera for you can be a tricky exercise. Get Online: Wireless Ways to Change Your Life Communications today require constant exchange of information between people at different locations instantaneously. CDR KING. Headphones - Find the best prices, information and user reviews. TDK WR700 2.4ghz Wireless Headphones Images - 1 of 1 at Mighty Ape NZ. TDK WR700 - Headphone - Find the lowest price, product reviews and information.
Wireless ear plugs. Wireless Earplugs. iBangle puts the iPod on the wrist. Samsung Galaxy S: 15 Free Android Applications.