Various Types Of Internet Connections:

Thinking of taking a Internet Connection But confused which to choose, here i am mentioning a list of connections to chooose from:

1.Dial-up connections :

Dial-up connections are one type of internet connection available from ISPs,(Internet Service Provideres) they are the slowest and the cheapest.

A dial-up connection allows you to connect to the internet via a local server using a standard 56k modem. Your Computer dials  a phone number   and connects to the server and finally the internet.

Modern dial-up modems typically have a maximum theoretical transfer speed of 56 kbit/s  although in most cases 40-50 kbit/s is the norm. Factors such as phone line noise as well as the quality of the mode itself

play a large part in determining connection speeds.  .

Dial-up connections usually have latency as high as 400 ms or even more, which can make online gaming or video conferencing difficult, if not impossible.  An increasing amount of Internet content such as streaming media will not work at dialup speeds.

Increasing Dial-up Speed:

Now a days various algorithms of data compression are used to increase the speed of data transfer like

 V.42, V.42bis and V.44.

 2.DSL Connections:
DSL is also called an always on connection because it uses existing 2-wire copper telephone line connected to the premise 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. The two main categories of DSL for home subscribers are called ADSL and SDSL.

ADSL :
ADSL (Asymmetric Digital Subscribers Line) connections are becoming more and more widely available and popular. It  work by splitting your phone line into two separate channels, one for data (internet) and one for voice (phone calls), which means you can talk on the phone and be connected to the internet at the same time. Some common configurations for a ADSL connections:

• 256Kbps/128Kbps
• 512Kbps/128Kbps
• 1Mbps/256Kbps
• 2Mbps/512Kbps
• 8Mbps/1024Kbps

Notice there are two values to each configuration, the first figure states the download speed and the second figure is the maximum upload speed. 

 

Lex in fig denotes your local exchange.

ADSL filter/splitter:

ADSL technology eliminates the need for a second phone line by allowing voice and data transfer at the same time.Since ADSL transfers data digitally it eliminates the usual performance overhead associated with standard dial-up connections, in other words ADSL doesn't need to convert the data from digital to analogue and back It enables faster data transmission over copper telephone lines by utilizing frequencies that are not used by a voice telephone call.The distinguishing characteristic of ADSL over other forms of DSL is that the volume of data flow is greater in one direction than the other, i.e. it is asymmetric. Providers usually market ADSL as a service for consumers to connect to the internet in a relatively passive mode: able to use the higher speed direction for the "download" from the Internet but not needing to run servers that would require high speed in the other direction.

ADSL+2
ADSL +2 is an extension to ADSL broadband technology that provides subscribers with significantly faster download speeds when compared to traditional ADSL connections. ADSL+2 works in the same fashion as ADSL a special filter is installed on a subscriber's telephone line to split existing copper telephone lines (POTS) between regular telephone (voice) and ADSL+2. ADSL2+ service is most commonly offered in highly-populated metropolitan areas and subscribers must be in close geographical locations to the provider's central office to receive ADSL2+ service. 

SDSL
 SDSL is still more common in Europe. Short for symmetric digital subscriber line, 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 or VHDSL (Very High Bitrate DSL) is a DSL technology providing faster data transmission over a single flat untwisted or twisted pair of copper wires. It offers fast data rates over relatively short distances — the shorter the distance, the faster the connection rate. These fast speeds mean that VDSL is capable of supporting high bandwidth applications such as HDTV, as well as telephone services  and general Internet access, over a single connection.

3.Cable Connections:
Cable connections are considered one of the best types of internet connection available to the home user, they offer very fast and reliable connections with a fixed monthly fee. Cable companies usually offer different packages to suit different internet subscribers, your choice of package, as with all internet connections, will depend on how you intend to use the internet.The different packages will offer different speed specifications and bandwidth limits.Because a cable connection uses a totally separate medium to transfer data it doesn't affect your ability to make/receive phone calls.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.

 

What is an IP address?