Tampilkan postingan dengan label Wireless Connections. Tampilkan semua postingan
Tampilkan postingan dengan label Wireless Connections. Tampilkan semua postingan

Sabtu, 28 Maret 2009

High-Speed Internet - Cable Versus DSL

Introduction to Cable and DSLIf you're looking for life in the fast lane, and are interested in delving into the world of high-speed internet access for your home or office, there are two main contenders:
DSL
CableThe services are similar in that they'll offer you super-fast Web surfing; at least three times as fast as dial-up. They'll also allow you to download files, stream video or send sizable emails multiple times faster than dial-up. So, you can finally send those pictures of your kiddies to mom and dad.
Differences Between Cable and DSLBut, there are differences between cable and DSL that may affect which of these services you select.
Cable Versus DSL on BandwidthWinning the bandwidth or speed battle is usually 'Cable' modem Internet services. Cable download speeds are up to 2 times faster than DSL. But cable services can slow down significantly if many people are accessing the Internet at the same time in the same area. Basically, the same cable line often connects to many households in your neighborhood, so if you and your neighbor are both using the service at once, your speed may suffer and become more sluggish. That's also the reason why cable modem services may not always be as secure as DSL.
Cable Versus DSL on SecuritySince cable uses a shared line, anyone in your neighborhood could potentially access the same local area network or LAN that you use, and be able to click on your Windows Network. That means they could see your personal information or even download copies of your data. Make sure to put the proper security measures in place - like a firewall and anti-virus software - no matter which service you decide on.So, winning the battle over best security, definitely DSL!
Cable Versus DSL on InstallationWhen it comes to installation, cable has a leg up. All you have to do is call the cable guy and get the new line installed and then you connect the line to your modem. It's as easy as hooking up your VCR to your television.With DSL you'll need a phone line and it may require you to take multiple steps on your computer after you install the DSL modem that the phone company provides. You may also be required to put filters on all of your additional phone jacks.
Buy Cable or DSLThe last thing to consider is cost. DSL tends to be less expensive than cable. With DSL, look for package deals through your phone company that may also reduce your phone bill. Here's the catch with cable modem services, if you don't subscribe to cable then you may have to pay an additional monthly fee for the service. But cable subscribers should also search for package deals. The champ in the cost arena is DSL.Again, you can't go wrong with either service, and not all cities or locations offer both so your choice may be limited to one or the other. But, my pick for the overall winner in what is a very close match? CABLE. I'm Brett Larson, About Gadgets.


Are you tired of your slow modem chugging along and taking 3 hours to download the latest and greatest software updates? You don't have to face that problem anymore in most areas of Little Rock! High speed Internet access is available and most of your friends probably already have either cable modem access or DSL. Southwestern Bell says DSL is better than cable. Comcast says it's faster than DSL. What do you do? Who do you choose? I've had both running and am here to dish the dirt on the two major broadband Internet providers in Little Rock.
Good news about both:
Cable or DSL Internet access will both free up your phone line so you can make calls and surf the Internet at the same time. They will also both make downloading things like music and video quicker. Both can be configured for wireless access at your house and both can connect multiple home computers to one Internet connection.
Is it available?
First things first, you may not have a choice. DSL is location specific. You have to be close to the central office (or a DSL hub). If you're not, you're just going to have to choose a cable provider, like Comcast. Luckily, most areas in Little Rock have access to a DSL hub. Which is Faster?
Speedwise, I find both basic accounts are comparable. Speed of the DSL is relative to line condition and distance from the central office. Cable modem speed is less dependant on location. In my experience, if you have a good DSL connection the speed will be more stable than a good cable connection. Either way, both are FAST.
The basic account on Comcast offers 4 Mbps/384 Kbps. The basic account on SBC offers 1.5Mbps/384Kbps. Those are the "top speeds." I rarely acheive those speeds when I test my line. Both companies also offer enhanced accounts with even more speed. Which is Easier?
In the ease of use department, Comcast is king! You turn on your computer and you're online. You have to "connect" to Southwestern Bell DSL unless you modify your setup a bit. That is an inconvenience, but it's not that big of a drawback. The connection rarely times out. If you keep your computer on, you can basically be online 24 hours a day. I've left mine on for a week before disconnecting with no problems. How about the Install?
This will depend on the situation. If you have a security system or bad wiring, DSL will be hard to set up by yourself. Even the SBC technicians refused to install mine over a security system. If you don't have any special circumstances, you won't even see the tech. They send you a package in the mail with phone line filters that just plug into place and you're set.
Comcast also has self-install kits but cable can be a bit tricky to install. For best results, the modem should be on a main cable line instead of a branched line. If you've had cable for a while and have it in many rooms in your house it could be difficult to find a satisfactory cable. To make things more difficult, splitting a cable with even a high quality splitter can make connections less stable. The best choice is to have a technician install a new, dedicated line for your modem. They normally charge a fee for this but it's an investment worth making. Which is Cheaper?
Price is the next biggest factor. SBC normally has specials running (currently $14.95 if you sign a one-year contract) on the service. Modems and routers are purchased for about $99-149. The self install kit costs vary.
Comcast charges $42.95/month for current cable customers. Their enhanced service with faster speeds is $10 more. You can either buy a modem or rent it for $7 a month. The self install kit is $29.95 plus shipping. Professional installation is about $100.The Bottom Line
I like both and I really can't tell that much of a difference. Comcast seems more user friendly and they have an idiot proof "member center" where you can setup new things on your account, talk to tech support, test your connection, etc. No matter what you choose be sure to tweak your settings or you'll lose lots of speed. Have fun and be sure to check out this site when you get your super fast connection!

A wireless access point



A wireless access point (sometimes called an "AP" or "WAP") serves to join or "bridge" wireless clients to a wired Ethernet network. Access points centralize all WiFi clients on a local network in so-called "infrastructure" mode. An access point in turn may connect to another access point, or to a wired Ethernet router.
Wireless access points are commonly used in large office buildings to create one wireless local area network (WLAN) that spans a large area. Each access point typically supports up to 255 client computers. By connecting access points to each other, local networks having thousands of access points can be created. Client computers may move or "roam" between each of these access points as needed.
In home networking, wireless access points can be used to extend an existing home network based on a wired broadband router. The access point connects to the broadband router, allowing wireless clients to join the home network without needing to rewire or re-configure the Ethernet connections.
As illustrated by the Linksys WAP54G (compare prices) shown above, wireless access points appear physically similar to wireless routers. Wireless routers actually contain a wireless access point as part of their overall package. Like wireless routers, access points are available with support for 802.11a, 802.11b, 802.11g or combinations.














A wireless network adapter allows a computing device to join a wireless LAN. Wireless network adapters contain a built-in radio transmitter and receiver. Each adapter supports one or more of the 802.11a, 802.11b, or 802.11g Wi-Fi standards.
Wireless network adapters also exist in several different form factors. Traditional PCI wireless adapters are add-in cards designed for installation inside a desktop computer having a PCI bus. USB wireless adapters connect to the external USB port of a computer. Finally, so-called PC Card or PCMCIA wireless adapters insert into a narrow open bay on a notebook computer.
One example of a PC Card wireless adapter, the Linksys WPC54G (compare prices) is shown above. Each type of wireless network adapter is small, generally less than 6 inches (0.15 m) long. Each provides equivalent wireless capability according to the Wi-Fi standard it supports.
Some notebook computers are now manufactured with bulit-in wireless networking. Small chips inside the computer provide the equivalent functions of a network adapter. These computers obviously do not require separate installation of a separate wireless










A wireless print server allows one or two printers to be conveniently shared across a WiFi network. Wireless print servers for home networks generally are available in both 802.11b and 802.11g varieties.
Wireless print servers offer the following advantages:
Allows printers to be conveniently located anywhere within wireless network range, not tied to the location of computers
Does not require a computer be always turned on in order to print
Does not require a computer to manage all print jobs, that can bog down its performance
Allows administrators to change computer names and other settings without having to re-configure the network printing settings.
A wireless print server must be connected to printers by a network cable, normally USB 1.1 or USB 2.0. The print server itself can connect to a wireless router over WiFi, or it can be joined using an Ethernet cable.
Most print server products include setup software on a CD-ROM that must be installed on one computer to complete the initial configuration of the device. As with network adapters, wireless print servers must be configured with the correct network name (SSID) and encryption settings. Additionally, a wireless print server requires client software be installed on each computer needing to use a printer.
The Linksys WPS54G (compare prices) 802.11g USB wireless print server is shown. Print servers are very compact devices that include a built-in wireless antenna and LED lights to indicate status.








A wireless game adapter connects a video game console to a Wi-Fi home network to enable Internet or head-to-head LAN gaming. Wireless game adapters for home networks are available in both 802.11b and 802.11g varieties. An example of an 802.11g wireless game adapter appears above, the Linksys WGA54G (compare prices).
Wireless game adapters can be connected either to a wireless router using an Ethernet cable (for best reliability and performance) or over Wi-Fi (for greater reach and convenience). Wireless game adapter products include setup software on a CD-ROM that must be installed on one computer to complete initial configuration of the device. As with generic network adapters, wireless game adapters must be configured with the correct network name (SSID) and encryption settings.












A wireless Internet video camera allows video (and sometimes audio) data to be captured and transmitted across a WiFi computer network. Wireless Internet video cameras are available in both 802.11b and 802.11g varieties. The Linksys WVC54G (compare prices) 802.11g wireless camera is shown above.
Wireless Internet video cameras work by serving up data streams to any computer that connects to them. Cameras like the one above contain a built in Web server. Computers connect to the camera using either a standard Web browser or through a special client user interface provided on CD-ROM with the product. With proper security information, video streams from these cameras can also be viewed across the Internet from authorized computers.
Wi-Fi Internet video cameras can be connected to a wireless router using either an Ethernet cable or wirelessly. These products include setup software on a CD-ROM that must be installed on one computer to complete initial Wi-Fi configuration of the device.
Features that distinguish different wireless Internet video cameras from each other include:
resolution of the captured video images (for example, 320x240 pixel, 640x480 pixel, and other image sizes)
motion sensors, and the ability to send email alerts when new activity is detected and captured
ability to timestamp images
built-in microphones and/or jacks for external microphones, for audio support
types of WiFi security supported, such as WEP or WAP






A wireless range extender increases the distance over which a WLAN signal can spread, overcoming obstacles and enhancing overall network signal quality. Several different forms of wireless range extenders are available. These products are sometimes called "range expanders" or "signal boosters." The Linksys WRE54G (compare prices) 802.11g Wireless Range Expander is shown above.
A wireless range extender works as a relay or network repeater, picking up and reflecting WiFi signals from a network's base router or access point. The network performance of devices connected through a range extender will generally be lower than if they were connected directly to the primary base station.
A wireless range extender connects wirelessly to a WiFi router or access point. However, due to the nature of this technology, most wireless range extenders work only with a limited set of other equipment. Check the manufacturer's specifications carefully for compatiblity information.

Senin, 16 Februari 2009

Wireless Connections


Ed Dickson

Yesterday, I wrote about how the FBI is warning us that personal details can be stolen (i-jacked) when using public computers. This occurs using crimeware, previously installed on a public computer, logs the keys you are stroking and sends the information (electronically) to criminals.

It can be dangerous to look at any of your online financial information on these (public access) machines.

When writing about this phenomenon, I remembered that even using your personal computer at a public place with a wireless connection can expose a person's personal and sometimes, financial details.

Just the other day, Martin Bosworth, over at Consumer Affairs, wrote an excellent piece covering this danger, where he stated:

Sending unencrypted information over any unfamiliar network can turn your computer into an open book -- with pages full of your personal information.

Many of these connections are appear to be legitimate connections because they are spoofed (camouflaged to appear as if they are a trusted connection).

Spoofing a connection, or site isn't very hard to do. They simply copy and transpose pictures and statements (words) from legitimate sites to their own. The Artists Against website has a portal, where you can see fake websites that are up and running on the Internet, here.

Martin's article contains some excellent tips on how to navigate the murky waters of public hot spots, safely.

They can be viewed, here.

Interestingly enough, wireless technology, isn't only used to compromise individuals. In the recent TJX data breach, where some are saying 200 million records were stolen since 2003, reports are saying the data was stolen, using wireless technology.

It's being reported that this was accomplished from a car with a laptop. Driving around with a laptop, using other people's wireless connections, is sometimes referred to as "war-driving," which is my new word for the day.

Joseph Pereira (Wall Street Journal) wrote about this (courtesy of the Northwest Florida Daily News), here.

source:http://computer-news-article.blogspot.com/2007/05/how-to-avoid-getting-your-information.html