Theoretically, full-duplex transmission can improve network efficiency, but it is still useful in cooperation with other related devices. For example, twisted pair network cable must be selected for full duplex transmission, and the hub connected in the middle should also be able to transmit full duplex; Finally, the adopted network operating system must also support full-duplex operation in order to truly exert the power of full-duplex transmission.
Advantages and disadvantages of power grid communication:
There are several communication modes used in the power grid, namely: optical fiber communication, ordinary microwave communication, power line carrier communication, wired audio cable communication, UHF radio communication and wireless spread spectrum communication. ?
1. Optical fiber communication is characterized by large communication capacity and high speed. It can transmit hundreds or even thousands of telephone calls and real-time images in one optical fiber, with good anti-electromagnetic interference performance, high communication quality and long service life. But the cost is high, especially for long-distance erection, and it is limited by terrain. ?
2. Ordinary microwave communication is a wireless communication mode with large transmission capacity, high quality and flexible configuration. It is widely used in substations above 220kv in power system, and this communication mode requires higher environment. In addition, the construction of an ordinary microwave communication network requires on-site survey and design, so the total construction cost is also high. ?
3. Power line carrier communication is common. The biggest advantage is that where electricity extends, communication can go, and the investment is not big. However, its disadvantages are poor reliability and small communication capacity, which leads to poor voice call quality and low data transmission rate. The communication from substation to dispatching needs to be solved by setting up audio cables. ?
4. Wired audio cable communication is widely used, and it is a better communication mode in the case of close distance, and its communication channel is analog channel. Therefore, in data communication, it is necessary to add a modem, which has poor anti-interference and is prone to lightning strike. When long-distance communication is carried out, the required wire diameter is thicker and the cost is higher. Generally, it is not used to form a larger communication network, and it is only used locally.