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What Does ADSL Splitter Do? and how does it work? w can use adsl without splitter. so why we must use this

Thanks

ADSL over Standard PSTN Lines
Telephone wires were originally designed to carry "Commercial Speech" between your home and the telephone exchange. This uses a band of frequencies from 300 to 3400 hertz. this system is called PSTN (public switched telephone network).

ADSL uses frequencies very much higher than this speech band to carry fast data traffic. ADSL systems use typically frequencies between 25 kHz and around 1.1 MHz.

Because PSTN and ADSL systems operate at different frequencies, they can be carried though the same wire pair at the same when the operating conditions are right. Voice calls operate between 300Hz and 3.4KHz, and include also DC power (0-72V DC at on-hook condition, typically 0-60 mA current and lower voltage at on-hook) and ring voltage (typically 40-80 V AC at 20-25 Hz frequency). The voice telephone system is matched to 600 ohm (or close to it) impedance at voice frequencies. ADSL technology operates between 26KHz and 1.1 MHz and is designed for around 100 ohms impedance. Because the two frequency spectrum do not overlap, it follows that both data and voice can be present at the same time on a single pair of copper wire. The different impedance have historical and technical reasons. The impedance of telephone wiring is typically around 100-120 ohms at the frequencies ADSL system uses. The cable impedance is somewhat higher at voice frequency range, considerably higher than 100 ohms, and where where historical 600 ohms impedance comes to picture (cable might not be exactly 600 ohms for voice, but that's what devices are designed for).

Why splitters / filters are needed
When ADSL and PSTN work at the same line at the same time, the electronics inside a normal telephone can be problem for high frequency ADSL signals: the ADSL signals can be attenuated (high capacitance on telephone input, possible resonances inside telephone, impedance mismatch) and ADSL signals can be heard as noise on some telephones (phone electronics demodulates high frequency signal outside it's operating range to voice frequency noise). In order to keep these systems apart and stop them interfering with each other it is necessary to separate the two components from the telephone line in your home.

This is where the Filter / Splitter comes in. The ADSL POTS Splitter / filter allows taking the full advantage of the 1.1MHz copper line frequency spectrum, by stopping the telephone and ADSL systems from interfering with each other.

What will happen if I do not use a splitter?
Without DSL filters, signals or echoes from analog devices at the top of their frequency range can result in reduced performance and connection problems with DSL service, while those from the DSL service at the bottom of its range can result in line noise and other issues for analog devices.

SLT guys also have a fairly good explanation (quite unusual, isn't it? ). See faq 12 of http://www.slt.lk/data/forhome/107adsl_faq.htm

use this link and read if you are interesting in ADSL technology --

http://docs.google.com/viewer?a=v&q=cac ... wBJ5YhdIlw

Introduction to ADSL



ADSL (Asymmetric Digital Subscriber Line) is an Internet access technology that makes use of the existing telephone network to provide broadband Internet service to homes and businesses. At the present time, ADSL is the most popular high-speed Internet access technology for home and businesses in many parts of the world.

This tutorial explains what ADSL broadband is and how it works. It describes the strengths and limitations of this high-speed Internet access technology. The cost of ADSL service and service availability are also addressed.


ADSL Technology



Asymmetric DSL (digital subscriber line) is a technology that leverages a conventional telephone line to provide "always on", high-speed Internet connectivity. Because it doesn't require a dedicated phone line, ADSL is able to share a line with an existing telephone service without impacting that phone service in any way.

The word "asymmetric" means that the capacity to send data upstream and downstream is not equivalent. "Digital" means that data or voice is converted into a binary format where the audio or video data is represented by a series of "1"s and "0"s. The term "subscriber line" simply refers to the copper pair telephone wires that are used for conventional phone service.

To provide ADSL broadband service, special equipment is required at the telephone exchange and an ADSL modem is needed at the residence or business.

Strengths of ADSL



Because ADSL broadband service leverages the existing telephone network, the technical infrastructure for ADSL service is relatively inexpensive. In addition, because nearly 100% of homes in the developed world already have a land line telephone service and most people live in urban areas nearby telephone exchanges, ADSL service is widely available.

ADSL broadband allows files to be downloaded from the Internet very rapidly. This works well for most Internet uses such as web surfing, live text chat, email, streaming media and for other popular applications.

Unlike dial-up Internet connectivity, ADSL is "always on" and therefore readily available. Unlike dial-up, ADSL does not does not monopolize the phone line.

Two or more computers can be connected to a single ADSL broadband connection. This allows multiple users to concurrently access the Internet without noticeable degradation in response.


ADSL Weaknesses



ADSL broadband is not available everywhere. Special equipment must be installed at the telephone exchange and the users must be located within 5.5 kilometres of the exchange. The speed of ADSL Internet service deteriorates the farther a home or business is located away from the telephone exchange.

ADSL is not well suited for all Internet applications. Because the ADSL "pipeline" to send data is comparatively small, Internet applications such as web conferencing, web hosting, VoIP (Internet telephony) and VPN (Virtual Private Networking) are not well suited for ADSL (but none-the-less will work).

Pipeline Capacity

The "upstream" and "downstream" pipelines for ADSL have different capacities. The ADSL "pipeline" for sending data is much smaller than the pipeline for receiving data. This asymmetry is not a problem for the most common uses of the Internet.



ADSL broadband can transfer data at rates of 1.5 to 9 Mbps (megabits per second) when receiving data. The ability of ADSL to send data, however, is limited to between 16 to 640 Kbps. By comparison.

Alternatives to ADSL

ADSL broadband is the most popular form of DSL Internet connectivity at present. Other types of DSL services including SDSL are expected to gain popularity in the years to come.

Broadband Internet services are also available via cable, satellite and wireless technologies

ADSL Installation



It normally takes only a few minutes to install ADSL in a home or business. A technician normally visits the premises to ensure that the telephone line is able to carry a strong, clear signal.

The ADSL technician will then connect the phone line to an ADSL modem and the modem to the computer. If multiple client computers are to share an ADSL Internet connection, a router is installed between the ADSL modem and the computers.

ADSL broadband modems can either be purchased or rented. Many ADSL providers include the cost of the modem in their monthly service charge.


if these things are helpful for you that is my happy..

thank you!

Thank you for All

well come.......