Foreword
Park monitoring is an important area of ​​the security market. The characteristics of park monitoring are: moderate scale, diverse requirements, and high degree of intelligence. If urban surveillance is the pinnacle of the security market, the monitoring of the park is a glimpse of the mountains in the field of security. It is a beautiful scenery and has unique features. Fengrun Dalai briefly introduced the unique EPON access technology under the park monitoring, and discussed together the new vitality of the “Into the Copper Retreat†era for the monitoring of the park.
EPON technology introduction
EPON, Ethernet passive optical network, is the product of perfect combination of Ethernet technology and PON technology. It constructs a pure media network, eliminates the active equipment between the central office and the user end, thus avoiding the electromagnetic interference and lightning impact of external devices, reducing the failure rate of lines and external equipment, and improving the reliability of the system. It saves maintenance costs at the same time; EPON technology uses a point-to-multipoint user network topology, and uses fiber to achieve full-service access to data, voice, and video, reducing the number of optical fibers and optical transceivers. EPON is a long-distance, high-bandwidth access technology. Currently, it can provide symmetric 1Gbps bandwidth for uplink and downlink, and it is expected to be upgraded to 10Gbps in the future, and the transmission distance will reach several tens of kilometers.
A typical EPON system includes OLT, ONU, and POS. The OLT optical line terminal is placed in the center room, and the ONU is placed near or integrated with the user equipment. The POS is a passive optical splitter. It is a passive device connected to the OLT and ONU. Its function is to distribute downlink data and centralize uplink data. Single-core optical fiber is used in EPON to transmit two waves in the uplink and downlink on one core (uplink wavelength: 1310nm, downlink wavelength: 1490nm, and it is also possible to superimpose 1550nm wavelength on this core to transmit analog television signals).
The OLT is not only a switch or router, but also a multi-service provision platform. It provides a fiber-optic interface (PON interface) for passive optical networks. In addition, it can also allocate bandwidth for different requirements of users' QoS/SLA, network security and Management configuration.
A POS is a simple device. It does not require a power supply and can be placed in a relatively relaxed environment. Generally, the split ratio of a POS is 8, 16, 32, 64, 128, and can be connected in multiple levels. A OLTPON port can be connected to a maximum of POS ports. The number of ONUs is closely related to equipment and is generally fixed. In the EPON system, the distance between the OLT and the ONU can be up to 20km.
The role of the ONU is to receive the optical signal of the OLT and convert it into an electrical signal, or to send the electrical signal converted optical signal of the user end to the OLT. The passive optical network we are talking about here refers to the pure medium in the middle transmission range, while the OLT and ONU are both active devices at the central office and the terminal.
EPON Application in Park Monitoring
EPON technology is characterized by high bandwidth, high stability, and high utilization of line resources. This technology has its own natural advantages when used in campus monitoring. First, the campus monitoring requires a high-speed, high-quality private network environment to carry its high-quality video services. The EPON technology provides up-down symmetric 1Gbps bandwidth that can fully meet the needs of video services. Secondly, the flexible topology of EPON takes maximum care of the layout of the park. Whether it is dense buildings or sparse roads, it is possible to use appropriate networking. Finally, the high security and high stability of EPON have also brought the level of access technology monitored by the park to a new level.
When the center of the campus needs high-density monitoring points to access, the EPON can adopt a fold-line layout, making full use of the length of the optical fiber transmission and extending to every area that needs to be deployed. The reserved excess fiber can be used for future capacity expansion access.
The monitoring of the surrounding roads can be done in a single-fibre pattern, and the park will be captured in the fiber ring. In a small campus environment, an EPON with an effective length of 20 KM can fully provide access. In a large campus, multiple line relays can be used to solve distance problems.
Currently, Fengrunda has introduced high-performance OLTs and PoE switches with PON functions. Selecting an ONU with PoE function is the best choice for inconvenient surveillance cameras.
Park monitoring is an important area of ​​the security market. The characteristics of park monitoring are: moderate scale, diverse requirements, and high degree of intelligence. If urban surveillance is the pinnacle of the security market, the monitoring of the park is a glimpse of the mountains in the field of security. It is a beautiful scenery and has unique features. Fengrun Dalai briefly introduced the unique EPON access technology under the park monitoring, and discussed together the new vitality of the “Into the Copper Retreat†era for the monitoring of the park.
EPON technology introduction
EPON, Ethernet passive optical network, is the product of perfect combination of Ethernet technology and PON technology. It constructs a pure media network, eliminates the active equipment between the central office and the user end, thus avoiding the electromagnetic interference and lightning impact of external devices, reducing the failure rate of lines and external equipment, and improving the reliability of the system. It saves maintenance costs at the same time; EPON technology uses a point-to-multipoint user network topology, and uses fiber to achieve full-service access to data, voice, and video, reducing the number of optical fibers and optical transceivers. EPON is a long-distance, high-bandwidth access technology. Currently, it can provide symmetric 1Gbps bandwidth for uplink and downlink, and it is expected to be upgraded to 10Gbps in the future, and the transmission distance will reach several tens of kilometers.
A typical EPON system includes OLT, ONU, and POS. The OLT optical line terminal is placed in the center room, and the ONU is placed near or integrated with the user equipment. The POS is a passive optical splitter. It is a passive device connected to the OLT and ONU. Its function is to distribute downlink data and centralize uplink data. Single-core optical fiber is used in EPON to transmit two waves in the uplink and downlink on one core (uplink wavelength: 1310nm, downlink wavelength: 1490nm, and it is also possible to superimpose 1550nm wavelength on this core to transmit analog television signals).
The OLT is not only a switch or router, but also a multi-service provision platform. It provides a fiber-optic interface (PON interface) for passive optical networks. In addition, it can also allocate bandwidth for different requirements of users' QoS/SLA, network security and Management configuration.
A POS is a simple device. It does not require a power supply and can be placed in a relatively relaxed environment. Generally, the split ratio of a POS is 8, 16, 32, 64, 128, and can be connected in multiple levels. A OLTPON port can be connected to a maximum of POS ports. The number of ONUs is closely related to equipment and is generally fixed. In the EPON system, the distance between the OLT and the ONU can be up to 20km.
The role of the ONU is to receive the optical signal of the OLT and convert it into an electrical signal, or to send the electrical signal converted optical signal of the user end to the OLT. The passive optical network we are talking about here refers to the pure medium in the middle transmission range, while the OLT and ONU are both active devices at the central office and the terminal.
EPON Application in Park Monitoring
EPON technology is characterized by high bandwidth, high stability, and high utilization of line resources. This technology has its own natural advantages when used in campus monitoring. First, the campus monitoring requires a high-speed, high-quality private network environment to carry its high-quality video services. The EPON technology provides up-down symmetric 1Gbps bandwidth that can fully meet the needs of video services. Secondly, the flexible topology of EPON takes maximum care of the layout of the park. Whether it is dense buildings or sparse roads, it is possible to use appropriate networking. Finally, the high security and high stability of EPON have also brought the level of access technology monitored by the park to a new level.
When the center of the campus needs high-density monitoring points to access, the EPON can adopt a fold-line layout, making full use of the length of the optical fiber transmission and extending to every area that needs to be deployed. The reserved excess fiber can be used for future capacity expansion access.
The monitoring of the surrounding roads can be done in a single-fibre pattern, and the park will be captured in the fiber ring. In a small campus environment, an EPON with an effective length of 20 KM can fully provide access. In a large campus, multiple line relays can be used to solve distance problems.
Currently, Fengrunda has introduced high-performance OLTs and PoE switches with PON functions. Selecting an ONU with PoE function is the best choice for inconvenient surveillance cameras.
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