Bleaching Earth For Refinery,Special Bleaching Earth For Refinery,Refinery Special Bleaching Earth,Special Refinery Bleaching Earth XUYI BOTU ATTAPULGITE CLAY CO.,LTD , https://www.xuyibotu.com
Analysis of the advantages of remote monitoring transmission bottleneck passive optical network
In recent years, the continuous development of network video surveillance is inseparable from the support of network broadband. At the same time, the huge demand for bandwidth from network monitoring has also promoted the development of access technologies. Network monitoring is mainly characterized by high-definition, networking, extensiveness, and complexity. Along with the construction of “safe cities†and “smart citiesâ€, the access of optical transceivers and access to optical fiber transceivers cannot meet the demand for access bandwidth. There will be bottlenecks in the existing access methods.
With the development of modern cities towards multi-functions, the layout of cities has become increasingly complex, and there are hundreds, hundreds, and even thousands of ground monitoring points. It is necessary to ensure that functional departments can grasp real-time, clear, high-quality video images in the first place. Fiber optic resource tension. Moreover, in today's increasingly powerful and complex urban functions, the re-laying of optical cables is not only very costly, but the coordination of all parties is even more difficult. In view of this, how to solve the above problem?
In fact, the same problem was encountered in the construction of FTTH (fibre to the home) of telecommunication operators. In order to solve this problem, give full play to the bandwidth advantages of optical fiber, solve the shortage of optical fiber resources, and improve the reliability of the network, telecommunication operators have chosen PON (passive optical network) technology. This technology can also be applied to security network monitoring.
PON (Passive Optical Network) is a passive optical network. A passive optical network includes an optical line terminal (OLT) installed at a central control station and a set of matching optical network units (ONUs) installed at the customer premises. The optical distribution network (ODN) between the OLT and the ONU includes optical fibers and passive optical splitters or couplers.
Passive optical networks do not have any active devices from the center to the premises network. Instead, passive optical devices are inserted into the network and the transmitted traffic is directed over the entire path by separating the power of the optical wavelengths. This replacement eliminates the need for the user to power and maintain the active devices in the transmission loop, significantly saving the user's cost. Passive beam splitters and couplers only serve to transmit and limit light, require no power supply and information processing, and have an unrestricted mean time between failures, which can reduce overall maintenance costs.
The advantages of PON technology are mainly reflected in the following aspects:
1, fiber access network is the most suitable solution for future development, especially PON technology has proved to be a very cost-effective way of integrated broadband access.
2. Since the PON technology is adopted, the entire optical distribution network is passive, and the passive optical network is small in size and simple in equipment. Compared with copper network, PON can reduce maintenance and operation costs, and completely avoid electromagnetic interference and lightning interference.
3, The passive ONU (Optical Network Unit) of the PON does not need to supply power, which not only eliminates a series of problems of power supply, but also has better reliability than active devices.
4, Due to the use of passive devices, sharing optical fiber transmission media, the investment cost of the entire optical network is low.
5, PON to a certain extent is transparent to the transmission system used, and it is relatively easy to upgrade.
PON technology has become the industry’s first choice for implementing fiber to the home (FTTH). The PON technology adopts a point-to-multipoint topology, and downlink and uplink respectively transmit data through TDM and TDMA. The distance between the OLT and the ONU can be up to 20km. The transmission rate is bidirectional symmetric 1Gbps. The maximum split ratio is generally 1:32 or higher. It can be divided into one level or multiple splitters.
Using PON technology can effectively solve the network monitoring bandwidth and distance restrictions. The central office OLT equipment is deployed in the central office and uses multi-stage optical splitting to achieve flexible deployment. The ONU network camera is used as the terminal combination. The ONU can be a PoE switch with PON function. The administrator sends the upstream multicast data at the same time. Go to the customer's monitoring room and storage server. It can be monitored in real-time in the surveillance room, and video data can be sent to the storage server at the same time to facilitate the collection of post-mortem evidence.
In today's "light into copper retreat", the widespread application of PON technology is particularly important. The remote video surveillance system adopting the PON technology reasonably solves the problems of intensive and complicated monitoring points in modern cities and fiber optic resources, and has unparalleled superiority in the aspects of networking form, optical fiber resources, video quality, reliability and so on. The development of commercial remote video surveillance services provides the best network solution.