Technology Reviews

SEO in Chicago OneIms proves to be the best

admin — Thu, 05 Mar 2009 21:44:36 +0000

Search engine optimization is optimizing the search engines to make your business visible on the web. Optimizing your website on the search engine is not an easy task as it seems as 76% of the end users use natural search engines for their search. Most of the users are hesitant to use the sponsored links. Unless your website shows up among the first few websites on a natural search engine, the popularity of the site is not much. Improving the market value is crucial for every small or big business. The more people reading about your website would increase the popularity of the products or the services offered. The main aim of internet marketing is increasing the visits to the website, increasing the clicks on the website and increasing the use of services offered by the website. One IMS, a Web Design Chicago is one of the leading ventures in this field. They assure a number of our requirements such as placing the site amongst the top 5 for some particular as well as popular keywords. The keywords will be sorted out by the experts and will be dependant on various factors like ranking, contents and so on. They have a lot of features that make them very much different from any other web-designing company. One of their best quality is their future vision which will not only make your website branded, but will also help you monetize in a much higher level. This SEO Chicago company assures a boost of your website in all search engines like yahoo, Google and all the other leading search engines.

About Lenovo X301 ThinkPad

admin — Sat, 07 Feb 2009 16:35:54 +0000

First of all, let us get into the sytem configuration.

CPU 1.4GHz Intel Core 2 Duo U9400 ULV
RAM Included 2GB
RAM Upgradable To 4GB
Hard Drive Size 64GB
Hard Drive Speed 90MB/s Read and 70MB/s Write
Hard Drive Type SSD Drive
Optical Drive Type DVD+RW
Optical Drive Speed 8X
Display Size (inches) 13.
Native Resolution 1440×900
Graphics Card Intel GMA X4500MHD
Video Memory 384MB
Wi-Fi 802.11a/g/n
Bluetooth Bluetooth 2.0
Mobile Broadband Optional Add-on 3G connection from AT&T ($80) or Verizon Wireless ($150)
Operating System MS Windows Vista Business
Ports (excluding USB) DisplayPort; Ethernet; Headphone; Microphone; VGA
USB Ports 3
Card Slot(s) N/A
Warranty/Support One-year parts and labor/24/7 toll-free phone
Size 12.5 x 9.1 x 0.9 inches
Weight 3.4 pounds

Review

The design is almost same as that of the older think pads. Athough it has a 6 - cell batter and an 8x-DVD burner, it weighs 3.5 lbs lesser than the others. The X301’s exterior is a more squarish shape and has a mettalic black finish. Just like X300, the dimensions are the same and the sides are also tapered.The dimensions are 12.5 x 9.1 x 0.9.

The thinkpad has a lower performance when compared with it’s graphic tests.

The ThinkPad X301 has achieved a score of 3157 in the PCMark Vantage, which is 400 points higher than most ultraportables. It’s a great score, but still falls about 60 points shy of the Sony VAIO VGN-Z530N’s and almost 500 points shy of the Lenovo ThinkPad X200.

Gmail has launched “multi-pane” system

admin — Sat, 07 Feb 2009 16:16:27 +0000

Gmail has recently launched the multiple panes system, which as per the name helps you to use simoltaneously any number of panes in Gmail instead of opening a new tab.This not only makes Gmail a lot more efficient, but also makes it unique from all other mail services present in the internet.
This mew system has really helped people who often sort their mails using Labels, which earlier used to size the whole window. But now, you can view and work with more than one mail at one time.
How to enable multi-pane system?

There are only 3 steps to activate this system

First activate Gmail labs for your account.
After scrolling down a while you will find an option called “Multiple Inboxes”. - Enable it.
Then setup your panes by going to Gmail settngs and select “Multiple Inboxes”. Then make upto 5 panes. For creating a pane you will have to enter the label code like “label:books” through which you can create a list of messages that are tagged with the books label. But, the best feature is that you can also combine multiple panes into a single one.

Protocol

admin — Thu, 05 Feb 2009 05:04:37 +0000

A protocol means the rules that are applicable for a network. Protocol defines standardized formats for data packets, techniques for detecting and correcting errors and so on.
To understand the concept of a communication protocol, let us assume that A and B need to talk to one another. They want to exchange their ideas. But it turns out that, both, A and B are egoists. They start talking again simultaneously, then pause for breath simultaneously, and then start talking again. Now imagine the confusion and chaos. To avoid it, they must follow a set of rules while talking. For instance, say first A must talk, then he/she must give B a chance to put forward his/her ideas, and so on. This common set of rules would be known zz communication protocol for A and B.
Thus for effective use of a network it must follow a standardized protocol. There are various protocols that are used in various types of networks. For example, IBM LAN software, DEC net (Digital’s family of communication protocols), TCP/IP (Transmission Control Protocol/Internet Protocol) etc.

Advantages of the Linear Topology

admin — Wed, 04 Feb 2009 05:03:30 +0000

1. Short cable length and simple wiring layout. Because there is a single common data path connecting all nodes, the linear topology allows a very short cable length to be used. This decreases the installation cost, and also leads to a simple, easy to maintain wiring layout.
2. Resilient Architecture. The LINEAR architecture has an inherent simplicity that makes it very reliable from a hardware point of view. There is a single cable through which all the data propogates and to which all nodes are connected.
3. Easy to extend. Additional nodes can be connected to an existing bus network at any point along its length. More extensive additions can be achieved by adding extra segments connected by a type of signal amplifier known as repeater.
Disadvantages of the Linear Topology
1. Fault diagnosis is difficult. Although simplicity of the bus topology means that there is very little to go wrong, fault detection is not a simple matter. Control of the network is not centralized in any particular node. This means that detection of a fault may have to be performed from many points in the network.
2. Fault isolation is difficult. In the star topology, a defective node can easily be isolated from the network by removing its connection at the center. If a node is faulty on the bus, it must be rectified at the point where the node is connected to the network.
3. Repeater configuration. When BUS type network has its backbone extended using repeaters1, reconfiguration may be necessary.
4. Nodes must be intelligent. Each node on the network is directly connected to the central bus. This means that some way of deciding who can use the network at any given time must be performed in each node.

Difference between a LAN and a WAN

admin — Mon, 02 Feb 2009 05:02:18 +0000

The next task is to distinguish between LANs and WANs. LANs are different in the following important respects.
>• The distance between the nodes is limited. There is an upper limit of approx. 10 km, and a lower limit of 1 m.
>* While WAN usually operate at speeds of less than 1 mbps (one mega bits per second), LANs normally operate at between 1 and 10 mbps. Using optical fiber technology, it is possible to achieve speeds of the order of hundreds of mbps.
>¦ Because of the short distances involved, the error rates in LANs are much lower than in WANs. LANs error rate is 1000 times lower than in WANs so are normal.
>¦ The distance limitations involved in LANs normally mean that the entire network is under the ownership and control of a single organization. This is in sharp contrast to WANs, where the network is normally operated by the countries post and telecommunications authorities rather than by its users.
It can be seen from the above, the LANs, differ from other types of network in that the area they cover is limited. This means they can operate at high speeds and with very low error rates

Advantages of the Star Topology

admin — Thu, 29 Jan 2009 05:00:41 +0000

1. Ease of service. The star topology has a number of concentration points (where connections are joined). These provide easy access for service or reconfiguration of the network.
2. One device per connection. Connection points in any network are inherently prone to failure. In the star topology, failure of a single connection typically involves disconnecting one node from an otherwise fully functional network.
3. Centralized control/problem diagnosis. The fact that the central node is connected directly to every other node in the network means that faults are easily detected and isolated. It is a simple matter to disconnect failing nodes from the system.
4. Simple access protocols. Any given connection in a star network involves only the central node. In this situation, contention for who has control of the medium for the transmission purposes is easily solved. Thus in a star network, access protocols are very simple.
Disadvantages of the Star Topology
1. Long cable length. Because each node is directly connected to the center, the star topology necessitates a large quantity of cable. Whilst the cost of cable is often small, congestion in cable ducts and maintenance and installation problems can increase cost considerably.
2. Difficult to expand. The addition of a new node to a star network involves a connection all the way to the central node.
3. Central node dependency. If the central node in a star network fails, the entire network is rendered inoperable. This introduces heavy reliability and redundancy constraints on this node.
The star topology has found extensive application in areas where intelligence in the network is concentrated at the central node.

Data Transmission Techniques

admin — Sun, 25 Jan 2009 04:57:16 +0000

There are many ways of transmitting digital information through a medium. Making the choice between one technique and another is normally a question of comparison between performance, in terms of the speed and accuracy of transmission and cost.
There are two major obstacles to successful transmission : attenuation and noise. Noise can rise from a variety of sources in the environment and serves to distort the signal.
Attenuation is a measure of how much the strength of the signal is reduced in passing through the medium. It is proportional to the distance travelled.
For a particular medium, there will be a range of frequencies that can be transmitted through it.
In determining how much information can be sent through the cable, the most important aspect’ ; to consider is the width of this frequency range. This is known as the bandwidth of the medium.
Here there is a choice of baseband that carries a digital signal, or broadband that carries a radio frequency (RF) signal on the cable.
In baseband modulation, interfaces are relatively inexpensive as they require no special devices for generating the digital. Only one channel is available over the cable for communications and hence the signal can be transmitted at a single frequency at a time.

Network Switching Techniques

admin — Wed, 21 Jan 2009 04:59:16 +0000

Different types of switching techniques are employed to provide communication between two computers. These are : circuit switching, message switching and packet switching.
Circuit Switching
In this technique, first the complete physical connection between two computers is established and then data are transmitted from the source computer to the destination computer. That is, when a computer places a telephone call, the switching equipment within the telephone system seeks out a physical copper path all the way from sender telephone to the receiver’s telephone. The important property of this switching technique is to setup an end-to-end path (connection) between computer before any data can be sent.
Message Switching
In this technique, the source computer sends data or the message to the switching office first, which stores the data in its buffer. It then looks for a free link to another switching office and then sends the data to this office. This process is continued until the data are delivered to the destination computers. Owing to its working principle, it is also known as store and forward. That is, store first (in switching office), forward later, one jump at a time.
Packet Switching
With message switching, there is no limit on block size, in contrast, packet switching places a tight upper limit on block size. A fixed size of packet which can be transmitted across the network is specified. Another point of its difference from message switching is that data packets are stored on the disk in message switching whereas in packet switching, all the packets of fixed size are stored in main memory. This improves the performance as the access time (time taken to access a data packet) is reduced, thus, the throughput (measure of performance) of the network is improved.

Optical Fibers

admin — Tue, 13 Jan 2009 04:54:52 +0000

Optical fibers consist of thin strands of glass or glass like material which are so constructed that they carry light from a source at one end of the fiber to a detector at the other end. The light sources used are either light emitting diodes (LEDs) or laser diodes (LDs). The data to be transmitted is modulated onto the light beam using frequency modulation techniques. The signals can then be picked up at the receiving end and demodulated. The band width of the medium is potentially very high. For LEDs, this ranges between 20 and 150 mbps and higher rates are possible using LDs.
The major problems with optical fibers are associated with installation. They are quite fragile and may need special care to make them sufficiently robust for an office environment. Connecting either two fibers together or a light source to a fiber is a difficult process.
One of the major advantages of optical fibers over other media is their complete immunity to noise, because the information is travelling on a modulated light beam.
A side effect of this noise immunity is that optical fibers are virtually impossible to tap. In order to incept the signal, the fiber must be cut and a detector inserted.
Despite its shortcomings, optical fiber is an important technology and will be a very attractive transmission indeed.