Types of Internet Connections

3.5 Internet Connection


There are various type of connectivity to get hook on to Internet. They all can be broadly classified into following category.

3.5.1 Gateway Access

Gateway Access is also known as Level-One connection. It is the access to the Internet from a network, which is not on the Internet. The gateway allows the two different types of networks to “talk” to each other. But the users of the Gateway Internet have limited access to the Internet. They might not be able to use all the tools available on Internet. The local Internet Service Provider (ISP) normally defines this limitation.

Good example of network with Level One connectivity within India is that of VSNL (Videsh Sanchar Nigam Limited). All access to Internet from India are through VSNL gateway.

 

 

 
3.5.2 Dial-up Connection

‘Dial-up’ connection is also known as Level Two connection. This provides connection to Internet through a dial-up terminal connection. The computer, which provides Internet access is known as ‘Host’ and the computer that receives the access, is ‘Client’ or ‘Terminal’. The client computer uses modem to access a “host” and acts as if it is a terminal directly connected to that host. 56K modem access is now widely available and supported by most ISPs. It allows user to surf the Web at 56 Kbps with graphics. So this type of connection is also known as ‘Remote Modem Access’ connection. And the host to which the client gets connected is actually connected to the Internet by a full time connection (See Leased Connection).
In dial-up connection to Internet, Host carries all the command that are typed on a client machine and forward them to Internet. It also receives the data or information from the Internet on behalf of the ‘Client’ and passes it to them. The client computer acts as a ‘dumb’ terminal connected to remote host.
This type of connection can further be divided into three categories.


  • Shell Connection
In this type of Internet Connection, the user will get only textual matter of a Web Page. This connection does not support Graphics display.Shell Accounts were the only type of Internet access available for many years before the Internet entered in to the world of graphics and became more users friendly.
  • TCP/IP Connection
Today’s graphical World Wide Web browsers provide easier access with multimedia sound and pictures. The major difference between Shell and TCP/IP account is that, Shell account can only display text and does not support graphics display, whereas TCP/IP can display both.
  • ISDN
ISDN (Integrated Services Digital Network) offers Internet connectivity at speeds of up to 128 Kbps through the use of digital phone lines. ISDN is a dial-up service that has been provided by telephone companies for many years.
To access any of these dial-up accounts you need the followings;
  1. Computer
  2. Modem
  3. Telephone Connection
  4. Shell or TCP/IP/ISDN account from the ISP
  5. Internet client software such as Internet browser
 
  
3.5.3 Leased Connection
Leased connection is also known as direct Internet access or Level Three connection. It is the secure, dedicated and most expensive, level of Internet connection. With leased connection, your computer is dedicatedly and directly connected to the Internet using highspeed transmission lines. It is on-line twenty-four hours a day, seven days a week.
 
 
 
 
  
3.5.4 DSL
Digital Subscriber Line (DSL) is the newest technology being used for Internet access. DSL connects your home or office to the Internet through the same telephone wire that comes from the telephone pole on the street. Like ISDN, with DSL, user can make and receive telephone calls while connected simultaneously to the Internet. However, DSL service is limited in the distance that you can be from the provider’s point of presence (POP).
To use DSL you will need a DSL modem (also called a router), a Network Interface Card (NIC), and a telephone line. DSL is also relatively new technology that is just being introduced in many places. Hardware developers are working with service providers to make the service cost affordable for consumers. As time goes by, the service should become more widely available at a reasonable price.
 
 
3.5.5 Cable Modem Connection
The connection speed can be up to 10 times that of a dial-up and the cost is about twice that of an ISP’s dial-up account, with no phone company charges.Many people who have cable TV can now get a high – speed connection to the internet from their cable provider. Cable lines offer an extremely high bandwidth connection to the Internet. It divides the connection into lots of bands, and translates the data in the bands into signals that can be carried through cable lines. Cable modems change these signals into IP packets that your computer can understand.
To use cable modems you will need a cable splitter, a cable modem, and the service from a cable company. The installation process can be complex and is better left to a professional.
 
 
 
 
 
 
 
 
 

True-False Question


1. Gateway Access is also known as Level-One connection.

True False


2. Leased connection is also known as direct Internet access or Level Three connection.

True False


3. With DSL, user can make and receive telephone calls while connected simultaneously to Internet.

True False


4. Cable connection has slower speed than dial up connection.

True False


5. NIC refers to Never Interface Card.

True False


6. DSL  stands for Digital Subscriber Line.

True False
Multi-select
1. Types of Internet Connection are ?
Leased line
Gateway Access
Dial up
DSL



2. To access Dial-up you need....
Computer
Modem
DSL
Telephone Connection



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