1. Overview With the continuous rise of safe cities, global eyes and other projects in recent years, more and more cities will install video surveillance systems in important places and traffic roads to realize 24-hour monitoring of each important public place. Video surveillance began to expand rapidly from buildings and parks. Monitoring points expanded from a dozen or dozens of monitoring points to thousands or 100,000 monitoring points. Coverage ranged from one or two square kilometers to tens or hundreds of square meters. Kilometers. The traditional video surveillance system is difficult to carry such a large amount of access. New types of IP intelligent network monitoring have emerged.
With the development of network technology, the network of video surveillance has become extensive and complex. With the rapid increase in the number of front-end video collection devices and the deepening of the complexity of the network, more and more surveillance cameras are guilty of not being able to take power. Sometimes it is not possible to find a suitable power point and have to move the camera position, which greatly affects the monitoring effect. Therefore, in the construction of the monitoring system, there must be a good power supply and guarantee a certain degree of flexibility. In order to meet this kind of demand, PoE power supply technology emerges at the right moment, it supplies power to the camera through the network cable, removes the extra power wiring.
In addition, due to the increasing size of the video surveillance system and the wider distribution range, the business presents more point-to-point. The bandwidth requirement of each video service is often between 1 and 10M. In the past, ADSL has been difficult to meet. Video surveillance vendors began to introduce EPON technology into surveillance solutions: access to multiple monitoring points through a single fiber to solve large-scale access problems. Optical fiber access system realizes integrated service access for data, voice, and video, and has good economy.
2. System Design A complete EPON network consists of OLT, ONU, and optical splitters. The system design places an OLT in each sub-control center. Each OLT provides four GE interfaces (solar and electrical) that can provide two-way transmission channels for the monitoring center. The PON ports of each OLT are connected to passive light through optical fibers. The splitter performs passive splitting, and the separated optical fibers are then respectively connected to ONUs or OLTs of different monitoring nodes, and then connected to a DVR or a video server through an ONU's FE interface, and finally monitored by a camera. Each OLT can cover 20KM, up to 256 ONU nodes, and is small in size for easy placement. At the same time, different networking access modes can be provided according to different situations.
The quality of the video in the video surveillance project is very important. The video surveillance stream is mainly occupied by the uplink bandwidth. If the compression effect is based on the D1, the upstream bandwidth of each video stream is 2M. In this solution, one OLT in each police station is four PONs, and each PON has symmetric 1.25G bandwidth (effective bandwidth 900M) up and down, mainly considering upstream data bandwidth.
The maximum number of monitoring nodes in each sub-control center: 900 M × 4 × 2 M = 1 800 The maximum bandwidth of the DVR/DVS per ONU is calculated according to the split ratio of 1:32: 900 M ÷ 32 = 28 M.
According to the split ratio 1:64, the maximum bandwidth of the DVR/DVS per ONU is calculated as: 900M÷64=14M.
The solution can also control and adjust the bandwidth of each ONU through the control of the EPON system. The user can flexibly control the bandwidth according to the situation of each monitoring node. Each ONU bandwidth can reach 0-1000M (adjustable).
With the development of technology, the power supply mode is constantly being updated, and PoE power supply has become the mainstream power supply mode. The PoE supplies power to the network equipment on the other end through the network cable, which not only avoids additional power supply wiring, but also can supply power to multiple monitoring cameras at the same time.
In order to use PoE power supply in EPON network system, Feng Runda launched the EPS5081 with PoE power supply, which has 8 PoE power ports and 1 EPON port. It replaces the ordinary ONU as an access device and can be connected through the EPON port. The OLT, in turn, can connect the camera and power it.
In addition, stable operation of the EPON network requires an efficient and stable network management system to monitor network performance in real time. The main functions of network management include: configuration management, fault management, performance management, security management, and billing management. The most influential network management protocols at the moment are SNMP and CMIS/CMIP. They represent two major network management solutions. The main features of the SNMP protocol are simple, easy to implement, versatile, easy to extend, and robust, and it has been widely used and supported by the industry.
3. Conclusions The application of EPON access and PoE in the system has solved the high-density and wide-range access problems and camera power issues facing the large-scale monitoring of video surveillance systems. Through the unified network management of EPON, the failure rate of the system is effectively reduced, and the cost is saved for system maintenance.
With the development of network technology, the network of video surveillance has become extensive and complex. With the rapid increase in the number of front-end video collection devices and the deepening of the complexity of the network, more and more surveillance cameras are guilty of not being able to take power. Sometimes it is not possible to find a suitable power point and have to move the camera position, which greatly affects the monitoring effect. Therefore, in the construction of the monitoring system, there must be a good power supply and guarantee a certain degree of flexibility. In order to meet this kind of demand, PoE power supply technology emerges at the right moment, it supplies power to the camera through the network cable, removes the extra power wiring.
In addition, due to the increasing size of the video surveillance system and the wider distribution range, the business presents more point-to-point. The bandwidth requirement of each video service is often between 1 and 10M. In the past, ADSL has been difficult to meet. Video surveillance vendors began to introduce EPON technology into surveillance solutions: access to multiple monitoring points through a single fiber to solve large-scale access problems. Optical fiber access system realizes integrated service access for data, voice, and video, and has good economy.
2. System Design A complete EPON network consists of OLT, ONU, and optical splitters. The system design places an OLT in each sub-control center. Each OLT provides four GE interfaces (solar and electrical) that can provide two-way transmission channels for the monitoring center. The PON ports of each OLT are connected to passive light through optical fibers. The splitter performs passive splitting, and the separated optical fibers are then respectively connected to ONUs or OLTs of different monitoring nodes, and then connected to a DVR or a video server through an ONU's FE interface, and finally monitored by a camera. Each OLT can cover 20KM, up to 256 ONU nodes, and is small in size for easy placement. At the same time, different networking access modes can be provided according to different situations.
The quality of the video in the video surveillance project is very important. The video surveillance stream is mainly occupied by the uplink bandwidth. If the compression effect is based on the D1, the upstream bandwidth of each video stream is 2M. In this solution, one OLT in each police station is four PONs, and each PON has symmetric 1.25G bandwidth (effective bandwidth 900M) up and down, mainly considering upstream data bandwidth.
The maximum number of monitoring nodes in each sub-control center: 900 M × 4 × 2 M = 1 800 The maximum bandwidth of the DVR/DVS per ONU is calculated according to the split ratio of 1:32: 900 M ÷ 32 = 28 M.
According to the split ratio 1:64, the maximum bandwidth of the DVR/DVS per ONU is calculated as: 900M÷64=14M.
The solution can also control and adjust the bandwidth of each ONU through the control of the EPON system. The user can flexibly control the bandwidth according to the situation of each monitoring node. Each ONU bandwidth can reach 0-1000M (adjustable).
With the development of technology, the power supply mode is constantly being updated, and PoE power supply has become the mainstream power supply mode. The PoE supplies power to the network equipment on the other end through the network cable, which not only avoids additional power supply wiring, but also can supply power to multiple monitoring cameras at the same time.
In order to use PoE power supply in EPON network system, Feng Runda launched the EPS5081 with PoE power supply, which has 8 PoE power ports and 1 EPON port. It replaces the ordinary ONU as an access device and can be connected through the EPON port. The OLT, in turn, can connect the camera and power it.
In addition, stable operation of the EPON network requires an efficient and stable network management system to monitor network performance in real time. The main functions of network management include: configuration management, fault management, performance management, security management, and billing management. The most influential network management protocols at the moment are SNMP and CMIS/CMIP. They represent two major network management solutions. The main features of the SNMP protocol are simple, easy to implement, versatile, easy to extend, and robust, and it has been widely used and supported by the industry.
3. Conclusions The application of EPON access and PoE in the system has solved the high-density and wide-range access problems and camera power issues facing the large-scale monitoring of video surveillance systems. Through the unified network management of EPON, the failure rate of the system is effectively reduced, and the cost is saved for system maintenance.
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