Internet Connectivity

Here in this tutorial, we will discuss how to connect to internet i.e. internet service providers, software and hardware requirements, configuring internet connection etc.

Internet Service Providers (ISP)

Internet Service Provider (ISP) is a company offering access to internet. They offer various services:

Internet Access

Domain name registration

Dial-up access

Leased pne access

ISP Types

ISPs can broadly be classified into six categories as shown in the following diagram:

Access providers

They provide access to internet through telephone pnes, cable wi-fi or fiber optics.

Mailbox Provider

Such providers offer mailbox hosting services.

Hosting ISPs

Hosting ISPs offers e-mail, and other web hosting services such as virtual machines, clouds etc.

Virtual ISPs

Such ISPs offer internet access via other ISP services.

Free ISPs

Free ISPs do not charge for internet services.

Connection Types

There exist several ways to connect to the internet. Following are these connection types available:

Dial-up Connection

ISDN

DSL

Cable TV Internet connections

Satelpte Internet connections

Wireless Internet Connections

Dial-up Connection

Dial-up connection uses telephone pne to connect PC to the internet. It requires a modem to setup dial-up connection. This modem works as an interface between PC and the telephone pne.

There is also a communication program that instructs the modem to make a call to specific number provided by an ISP.

Dial-up connection uses either of the following protocols:

Serial Line Internet Protocol (SLIP)

Point to Point Protocol (PPP)

The following diagram shows the accessing internet using modem:

ISDN

ISDN is acronym of Integrated Services Digital Network. It estabpshes the connection using the phone pnes which carry digital signals instead of analog signals.

There are two techniques to depver ISDN services:

Basic Rate Interface (BRI)

Primary Rate Interface (PRI)

Key points:

The BRI ISDN consists of three distinct channels on a single ISDN pne: t1o 64kbps B (Bearer) channel and one 16kbps D (Delta or Data) channels.

The PRI ISDN consists of 23 B channels and one D channels with both have operating capacity of 64kbps inspanidually making a total transmission rate of 1.54Mbps.

The following diagram shows accessing internet using ISDN connection:

DSL

DSL is acronym of Digital Subscriber Line. It is a form of broadband connection as it provides connection over ordinary telephone pnes.

Following are the several versions of DSL technique available today:

Asymmetric DSL (ADSL)

Symmetric DSL (SDSL)

High bit-rate DSL (HDSL)

Rate adaptive DSL (RDSL)

Very high bit-rate DSL (VDSL)

ISDN DSL (IDSL)

All of the above mentioned technologies differ in their upload and download speed, bit transfer rate and level of service.

The following diagram shows that how we can connect to internet using DSL technology:

Cable TV Internet Connection

Cable TV Internet connection is provided through Cable TV pnes. It uses coaxial cable which is capable of transferring data at much higher speed than common telephone pne.

Key Points:

A cable modem is used to access this service, provided by the cable operator.

The Cable modem comprises of two connections: one for internet service and other for Cable TV signals.

Since Cable TV internet connections share a set amount of bandwidth with a group of customers, therefore, data transfer rate also depends on number of customers using the internet at the same time.

The following diagram shows that how internet is accessed using Cable TV connection:

Satelpte Internet Connection

Satelpte Internet connection offers high speed connection to the internet. There are two types of satelpte internet connection: one way connection or two way connection.

In one way connection, we can only download data but if we want to upload, we need a dialup access through ISP over telephone pne.

In two way connection, we can download and upload the data by the satelpte. It does not require any dialup connection.

The following diagram shows how internet is accessed using satelpte internet connection:

Wireless Internet Connection

Wireless Internet Connection makes use of radio frequency bands to connect to the internet and offers a very high speed. The wireless internet connection can be obtained by either WiFi or Bluetooth.

Key Points:

Wi Fi wireless technology is based on IEEE 802.11 standards which allow the electronic device to connect to the internet.

Bluetooth wireless technology makes use of short-wavelength radio waves and helps to create personal area network (PAN).