ADSL technology allows you to access the Internet through a special high-speed modem, which is connected via a dedicated line. The advantages of ADSL are high data rates and continuity of the connection.
Functioning principle
ADSL technology is based on the transformation of the signal going through the subscriber telephone line by multiplexing the data transmission frequencies used in the network. The connection to the Internet channel is carried out via an already installed telephone cable.
The technology itself is based on the fact that the frequency of the human voice does not exceed the frequency of 3.4 kHz. Thus, a signal exceeding 4 kHz is not used to build a conventional telephone line. Nevertheless, the bandwidth of the wire allows data to be transmitted at higher frequencies, which is what ADSL uses. To transmit data over the channel, the frequency signal is compressed by using additional equipment. A wave frequency of about 30 kHz in the wire is used to transmit a pulsed signal, i.e. data required to download information on the Internet.
Equipment used
To use a telephone channel as a means for transmitting data, the wire itself must have certain characteristics, i.e. have certain parameters of loop resistance (Internet quality
The speed and quality of ADSL access depends on the technical condition and parameters of the telephone line. Modern telephone networks use cables that are adapted to the Internet connection, which allows stable connections and relatively high data rates to be achieved. Nevertheless, the wires of some old telephone networks are not capable of transmitting data, and therefore the quality of the Internet from such providers is much lower.
