EPON is an emerging broadband access technology. It realizes integrated service access of data, voice and video through a single optical fiber access system, and has a good cost performance. EPON combines the advantages of passive optical network technology and Ethernet technology. Passive optical network technology, because of its point-to-multipoint topology and the characteristics of only passive components in transmission, has the advantages of saving laying costs and avoiding subsequent maintenance. , It is especially suitable for access network and has become a popular optical access network technology. Through cost-effective structure and technology, an effective broadband method is provided for end users of the access network. With the maturity of EPON technology and its flexible networking advantages, when building a video surveillance system, it is a good choice to use EPON technology to realize the front-end access of the video surveillance system.

 

There are two main solutions in the past, one is to realize the remote access of the monitoring point through optical fiber, and the other is to use the operator's network to access through ADSL. However, these traditional access methods have many problems. In fiber access, each camera occupies a fiber, which requires a lot of fiber resources and optical transceiver equipment, and the network construction cost is high. At the same time, the inherent deficiencies of the simulation system in maintenance and management capabilities have brought huge challenges to the operation, maintenance and upgrade of the entire system, especially when the scale of the system continues to expand, these problems become increasingly prominent. When ADSL accesses, the downstream bandwidth is large and the upstream bandwidth is small. During monitoring, a large amount of image information is continuously uploaded to the monitoring center. There is only a small amount of PTZ control information in the downstream. Subject to the ADSL traffic model, the encoder can only Compressing the image to a smaller size before uploading will inevitably lead to a decrease in image quality and also bring security concerns to the transmission network.

 

Faced with the high-bandwidth and low-cost access problems raised by customers, according to the characteristics of the monitoring point distribution, the company adopted the EPON design in this program to provide customers with low-cost, high-quality, large-scale video surveillance access solutions Program.

 

EPON advantages:

 

◆ Compatible with existing Ethernet EPON is only a supplement to the existing IEEE 802.3 protocol. The compatibility of EPON and Ethernet is one of its big advantages.

 

◆ The downstream channel of high-bandwidth EPON is a 100M/Gigabit broadcast mode, and the upstream channel is a 100M/Gigabit channel shared by users, which is better than Modem, ISDN, ADSL or even ATM PON (622/155Mbps downstream and 155Mbps upstream sharing ) Are much higher.

 

◆ Low cost EPON network reduces a large number of optical fibers and optical devices, reducing maintenance costs. As far as the price of Ethernet is concerned, its low-cost components and installation and maintenance make EPON have the advantages of ATM PON.

 

EPON video surveillance overall scheme diagram: