Computer & Mobile Tech Journal

WAYS OF ACCESSING INTERNET

Recently, i made mention of Internet and the world wide web ,As technology grows, so does our need for bigger, better and faster Internet connections. Over the years, the way content is presented via the Web has changed drastically. Ten years ago being able to center bold, colored text was something to admire, while today Flash website, animations, online gaming, streaming video, database-driven Web sites, e-commerce and virtual offices  to name but a few are becoming standards. The need for speed has changed the options available to consumers and businesses alike in terms of how and how fast we can connect to the Internet. But today i want to discuss with you some ways to access the internet.

1)   Dial-up Internet Access

Using a PCI modem connected to the PC, users connect to the Internet when the computer dials a phone number provided the your ISP and connects to the network. Dial-up is an analog connection because data is sent over an analog,  public telephone network. The modem converts received analog data to digital and vise versa. Because dial-up access uses normal telephone lines the quality of the connection is not always good and data rates are limited. Typical Dial-up connection speeds range from 2400 bps to 56 Kbps

Advantages

  • Low Cost: Dial up method has always been and will remain the cheapest method of connecting to the Internet. All kinds of usages are charged according to the telephone call tariff only. No extra money is charged just because it is being used in data transfer, most of the times. Sometimes, the prizes go up because of the individual requirements of speed and performance.Safety: A dial up connection is much safer than any other technology because of the rotation of the IP addresses, assigned to a user
  • Availability: This is probably the best feature of dial up internet access. It provides the user with the convenience of using his account wherever the service is available.

Disadvantages

  • Speed: Speed is one of the biggest disadvantages of a dial up connection. The maximum speed a dial up connection can achieve is 56,000 bytes per second, which is way too less compared to all the other technologies available, these days.
  • Requires dedicated use of telephone Line: A dial up connection requires a permanent phone line, that can be dialed to connect to the Internet. So you cannot always carry your internet along with you, like with some other technologies. though you can surf it from some other place but only when there is an existing phone line of the same service provider, at  that place.
  • Route Busy: By route busy, the technology means that the single line available, is being used for some kind of data transfer and hence anything else cannot be done right now. So if the user is using the line for internet purpose, the line will sound busy for the other people, who may be trying to dial in. Hence, there may be times, that you are connecting to the world and feeling liberated and at the same time, your parents (out for a trip) are going mad trying to call you up at home.

 

2)  Integrated Services Digital Network (ISDN)

Integrated services digital network (ISDN) is an international communications standard for sending voice, video, and data over digital telephone lines or normal telephone wires. Generally ISDN speeds range from 64 Kbps to 128 Kbps.

- B-ISDN (Broadband ISDN)

Broadband ISDN is similar in function to ISDN but it transfers data over fiber optic telephone lines, not normal telephone wires. SONET is the physical transport backbone of B-ISDN. Broadband ISDN has not been widely implemented.

 

- DSL (Asymmetric Digital Subscriber Line)

DSL also called an always on connection uses the existing 2-wire copper telephone line connected to the internet and will not tie up  your phone as a dial up connection does. There is no need to dial-in to your ISP as DSL is always on. It supports data rates up to 10Mbits when receiving data ( download ) and from 16 to 640 Kbps when sending data ( upload ). ADSL is called asymmetric because it supports different data rates for upload than for download traffic. The two main categories of DSL for home subscribers are called ADSL and SDSL.

- ADSL (Asymmetric Digital Subscriber Line)

ADSL: is the most commonly deployed types of DSL in North America . ADSL supports data rates of from 1.5 to 9 Mbps when receiving data (downstream rate) and from 16 to 640 Kbps when sending data (upstream rate). ADSL requires a special ADSL modem.

- SDSL (Symmetric Digital Subscriber Line)

SDSL is still more common in Europe. This is a technology that allows more data to be sent over existing copper telephone lines. SDSL supports data rates up to 3 Mbps. SDSL works by sending digital pulses in the high-frequency area of telephone wires and can not operate simultaneously with voice connections over the same wires. SDSL requires a special SDSL modem. SDSL is called symmetric because it supports the same data rates for upstream and downstream traffic.

- VDSL (Very High DSL)

VDSL is a DSL technology that offers fast data rates over relatively short distances — the shorter the distance, the faster the connection rate.

3) Cable : There are two type of cable; Coaxial and optic fiber. The first one is used by cable TV and that is common for data communications.

- Coaxial Cable

The cross-section of the cable shows a single centre solid wire made of copper surrounded by a copper mesh conductor. Between the main wire ( in the centre ) and the mesh conductor is an insulating dialectric. This dialectric ( blue part in the image ) has a large effect on the essential features of the cable. Depending on the material that the insulator is made of, the cable has different inductance and capacitance values and these values affect how quickly data travels through the wire. The last layer is an outside insulator to protect the whole wire. Data is transmitted through the rigid wire, while the outer copper mesh layer serves as a line to ground.

Through the use of a cable modem , you can have a broadband Internet connection that is designed to operate over cable TV lines. Cable Internet works by using TV channel space for data transmission, with certain channels used for downstream transmission, and other channels for upstream transmission. Because the coaxial cable used by cable TV provides much greater bandwidth than telephone lines, a cable modem can be used to achieve extremely fast access. Cable speeds range from 512 Kbps to 20 Mbps.

And Lastly,

4)    Wireless Internet Connections

Wireless Internet, or wireless broadband is one of the newest Internet connection types. Instead of using telephone or cable networks for your Internet connection, you use radio frequency bands. Wireless Internet provides an always-on connection which can be accessed from anywhere as long as you are geographically within a network coverage area. Wireless access is still considered to be relatively new, and it may be difficult to find a wireless service provider in some areas. It is typically more expensive and mainly available in metropolitan areas.

Wireless network (WLAN) can be used to share Internet access, files, printers, game consoles, and other devices among all the computers in the home. It is easier than ever to set up a wireless network, especially now that Internet access and routers (like Linksys wireless routers and D-link wireless routers) have become widely available. Wireless networks take advantage of unlicensed airwaves to transmit data at the 2.4 GHz frequency. The most common application of wireless networks is to remotely connect to the Internet from your laptop, but you can also use wireless networks to send print jobs to remote printers or, eventually, to connect all of your wireless devices (cell phones, PDA’s, etc) together.

You can also read: HOW TO CONNECT TWO COMPUTERS TOGETHER WITHOUT A CABLE

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