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Traditional access technology can not fully meet the demand
As one of the sources of massive data in the information age, only security video surveillance has produced huge information data. Especially in recent years, with the rapid development of safe cities, intelligent transportation and other industries, large-scale integration and large-scale networking have pushed the security industry into the era of big data. At the same time, the security industry is related to the national economy and the people's livelihood, involving smart cities, intelligent transportation, security monitoring, and emergency management. 
Under such circumstances, how to transmit high-rate, clear, and long-distance video surveillance information? The traditional peer-to-peer video optical transceiver access method and fiber optic transceiver access method, although providing a very high network transmission bandwidth, can transmit video data to several kilometers away, but the optical fiber resource utilization is low, the composition of the high, and Ultra-long-distance video transmission cannot be performed.
The monitoring application determines the choice of access technology
Networked and high-definition means that video surveillance can return monitoring images and data in real time, providing high-definition image quality.
From the application level, the PON network uses the ONU equipment to access the PON through the digital video streams of the camera output image signals from each monitoring point, and then implements multi-point-to-point access through the optical splitter. Because PON is a point-to-multipoint passive optical fiber transmission, it meets the requirements of large-scale, high-quality and high-stability massive video access monitoring. 
As far as the security industry is concerned, in the era of big data, the influx of massive information in various application scenarios, and the number and distance of information transmission per unit time are bound to become an important indicator of the assessment and monitoring system. Second, the security industry is related to the national economy and the people's livelihood, and the application work is mostly 24 hours. This places high demands on the exquisiteness of the monitor, remote viewing, and system stability. On the basis of ensuring monitoring effects, how to build monitoring projects at low cost and flexibility, PON access methods are particularly important.
Which access technology is more suitable for modern monitoring
From the above analysis of security monitoring application requirements, we can see that PON access is more suitable for security video applications. Mainly in the following areas:
1, suitable for CIF/D1/720P/1080P and other standard definition, high-definition camera access requirements.
2, Relatively low cost, simple maintenance, easy to expand, easy to upgrade. The PON structure does not need power and no electronic components during transmission, so it is easy to lay and basically does not require maintenance. The long-term operation cost and management cost are greatly saved; the EPON system has little overhead on the central office, high degree of modularity, and initial system investment. Low, easy to expand, and high return on investment; PON systems are future-oriented technologies, and most PON systems are multi-service platforms, which is a good choice for transitioning to all-IP networks. 
3, provide very high bandwidth. PON can provide symmetrical 1.25Gb/s bandwidth for uplink and downlink, and can upgrade to 10Gb/s with the development of Ethernet technology.
4, a large range of services, transmission distance. PON, as a kind of point-to-multipoint network, uses a fan-shaped structure to save limited fiber-optic cable resources and serve a large number of users. Due to the single core fiber transmission, the maximum transmission distance can reach 20km.
PON and PoE complement each other
The PON network consists of three parts: OLT, ONU, and POS. It acts as a bearer network for video surveillance. It can transmit monitoring screens and data in real time to create a safe and reliable network. The OLT device has a single PON port with an upstream bandwidth of 1.25G, and after 1:64 splitting. , Bandwidth up to 19.5M, large bandwidth and high quality to ensure image quality; PON network equipment is rich in form, to meet the use of a variety of complex scenes. PON is a long-distance, high-bandwidth access technology.
On the other hand, the application and popularization of PoE power supply technology solves the problem of installation and power acquisition of network surveillance cameras. It also becomes more flexible in the networking mode. It can be said to be a revolutionary technology, but it cannot solve the video. Demand for ultra-high bandwidth and ultra-long-distance transmission. With the wide application of PoE technology and the demand for PON, the ONU based on the power supply of the network cable is a more appropriate choice, and a device having both "PON" and "PoE" functions can be "born." 
As mentioned above, one component of the PON network is the ONU. Prior to the emergence of the PoE technology, the ONU was merely an ordinary optical access device. With the complementary application of multiple technologies, Feng Runda firstly integrated PON and PoE. Based on PoE, it first created a PoE switch with PON function, which is also a new type of ONU with PoE function. For areas where power is difficult to obtain, and where it is difficult to wire the channels, selecting a PoE switch with PON function is the best choice for networking. 
PON-PoE Video Solution
When high-density monitoring points are required for access and long-distance transmission, the layout of PON access is adopted, and the length of optical fiber transmission is fully utilized, extending to each area where distribution is required, and the effective transmission length reaches 20 km. And spare fiber can be reserved for future expansion access.
The access layer uses a PoE switch with PON function to simplify the construction purpose.
PON has always been regarded as the future development direction of access network. With the integration of PoE technology, the application prospects are promising. It is believed that this type of new product will soon have a huge advantage in video surveillance and will even change the entire campus surveillance landscape.
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 also drives 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.
September 15, 2019