What is plc?
Usually, the way we access the Internet is usually: dial-up?xdsl way using telephone lines; cablemodem way using cable lines, or Ethernet way using twisted-pair wires.
Now, we have another more convenient, more economical choice: the use of wires, which is plc! plc's full English name is powerlinecommunication, that is, power line communication. By utilizing the power line that transmits current as a communication carrier, it makes plc extremely convenient. As long as there is a power outlet anywhere in the room, without dialing a number, you can immediately enjoy 4.5~45mbps high-speed network access to browse the web? Make phone calls, and watch online movies, thus realizing the integration of data? Voice, video, and power all in one. video, and electricity in one "quadruple-play"! In addition, the house phone? TV? Audio? Refrigerator and other home appliances using plc connection, centralized control, to achieve the "smart home" dream. At present, plc is mainly used as an access technology to provide broadband network "last mile" solution for residential areas, schools, hotels, office buildings and other areas.
The technical principle of plc
plc utilizes the 1.6m to 30m band range to transmit signals. When sending, the use of gmsk or ofdm modulation technology will be user data modulation, and then in the power line transmission, in the receiving end, first through the filter will be modulated signal filtering out, and then through the demodulation, you can get the original communication signal. At present, the achievable communication rate is between 4.5m~45m depending on the specific equipment. plc equipment is divided into bureau and modem, the bureau is responsible for the communication with the internal plc modem and the connection with the external network. In communication, the data from the user into the modem modulation, through the user's distribution line transmission to the bureau end equipment, the bureau end will be demodulated out of the signal, and then transferred to the external internet.
plc advantages
1. low cost of realization due to the direct use of the existing distribution network can be used as a transmission line, so there is no need to carry out additional wiring, thus Greatly reduce the investment in the network, reducing costs.
2. wide range of power lines is the widest coverage of the network, its scale is incomparable to any other network. plc can easily penetrate into every home, creating great space for the development of the Internet.
3. High-speed rate plc can provide high-speed transmission. At present, its transmission rate depends on the different equipment manufacturers and between 4.5m ~ 45mbps. Far higher than dial-up and isdn, faster than adsl! Sufficient to support a variety of applications on existing networks. Higher speed plc products are under development.
4. Always online plc belongs to the "plug and play", without the tedious process of dialing, access to power is equal to access to the network!
5. Convenient no matter which corner of the home, as long as the connection to any power outlet in the room, you can immediately have plc to bring the enjoyment of high-speed network!
The application of plc
1. can provide users with high-speed Internet access services? Voice services, thus adding a new option for users to access the Internet and make phone calls.
2. Through the combination of control technology, the existing basis for the realization of "smart home" to provide strong support. The use of power lines as a physical medium, can be spread all over the corners of the residence of the information home appliances, pc, etc. Connected as a whole, access to the Internet, to realize the remote? Centralized management control.
3. Without additional wiring, you can connect multiple computers at home to form a home LAN.
4. Realize remote water? The system can be used as a remote water, electricity, and gas meter reading system. Gas and other automatic meter reading, a charge sheet can solve all the charges in the user's life
5. The use of plc's "always online" features, components of fire? Anti-theft? Anti-toxic gas leakage and other security monitoring system and medical rescue system.