With the rapid development of IPTV and multimedia services, users' requirements for access bandwidth are increasing. The current copper access technology is difficult to meet the requirements of high bandwidth, two-way transmission, and security. Before 2010, FTTB was the mainstream FTTx networking model in China, and FTTH had only a small amount of experimental constructio
The composite overhead ground cable (OPGW for short) is unique to the power system and has a new technology of dual functions of power line ground and fiber communication. As an emerging information transmission channel, OPGW has developed rapidly in China in recent years. It has the characteristics of large communication capacity, anti-interference, safety and reliability, and does not occupy the line corridor. At the same time, it will be the communication cable and high-voltage transmission line ground. Cleverly combined into a whole, its good mechanical properties and electrical conductivity no
The new OPPC technology solves the shortcomings of current electric power ADSS and OPGW optical cables, such as electric corrosion, inability to meet cross-over distance requirements, lightning strikes, theft, line loss, etc., and more importantly, provides wiring for future deployment of distribution network automation. Cable channel. The use of power system transmission line path resources to set up OPPC fiber optic cable is a good way to meet various needs.
Security monitoring system is an important system for enterprise factory to realize safety management. It mainly includes TV monitoring, burglar alarm, help for help, fire alarm and so on. The most important part of factory park management is to ensure the safety of office space and employees. In real life, everyone may have some unexpected help situations. Therefore, the security and alarm system is a necessary system with advanced design and equipment and guarantees the security of the enterprise factory.
Broadband access system. At that time, ATM was recognized as the best link layer protocol, and PON was recognized as the best physical layer protocol. The combination of the two naturally produced APON technology. Both FSAN and ITU have published APON technical specifications (the technical specifications used for APON have been accepted as ITU-T Rec. G.983). Currently, in countries such as Japan, the United Kingdom, and Germany. A mature APON system has been put into use.
Q: Is it dangerous to use a shielding system? A: No. If a TN-S system is used, the system is as safe as an unshielded twisted pair system. Poor grounding or poor power distribution systems can affect a variety of copper cabling systems. If using a TNC or TN-C system. Current will appear on the PE(N) line. If it is a screen