What is a four -wire circuit?
The four -wire circuit is defined as two pairs of two communication wires that allow signals to be transferred in both directions simultaneously. Contemporary communication is called a full-elly system where two people can speak and be heard at the same time. Many domestic and business data lines use these circuits to optimize data transfer. The electrical circuit, which provides 120 and 240 in the device by means of two hot or current wires, as well as neutral and ground, is also called a four -wire circuit.
Normal home phone equipment uses voice calls. Conversations can be held in both directions, but usually only a few phones can be connected to one two -wire line. Data communication would be limited in this type of circuit. Data speeds are significantly improving with smaller errors and signal loss. This system is called a fully duplex line, common from the 80s for data systems such as integrated system digital networks (ISDN). As demand for data speed increased, digitThe system systems have expanded to Ethernet digital systems, a pair of circuits with a four -wire circuit or eight wires that can handle voice and data communication.
The digital data system that can work on a two -wire line is a digital subscriber (DSL). This system uses voice and data communication through a single pair of wire by transferring two different frequencies. Normally, a filter is installed on each phone to prevent distortion from a higher frequency data signal. Due to the losses of the signal on the distance, DSL may not be available in areas that are too far from the device for carrying a telephone company.
until the end of the 20th century, the communication system was built from copper conductors dotted in non -conductive insulation. As the Internet grew and the data requirements increased, the networks were increasingly limited and the transfer rates were threatened. NetworkCompanies first began to convert wire networks to the coaxial cable and then to the optics of the fibers capable of transmitting multiple data using laser light transmitted by glass fiber. Home and businesses could subscribe to internet services from various companies and bring cable or fiber technology directly to the building.
The four -wire circuit has been replaced by cable and fiber systems for user data transmission. Inside the building, however, within the 21st century was widely used by a four -wire circuit in individual or more circuits. Wireless data networks can be used, but companies or individuals who are worried about data security can still choose a cable network that minimizes the risk of data theft.