CN101072330A - Closed circuit television monitoring system signal transmission method - Google Patents
Closed circuit television monitoring system signal transmission method Download PDFInfo
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- CN101072330A CN101072330A CN 200610079660 CN200610079660A CN101072330A CN 101072330 A CN101072330 A CN 101072330A CN 200610079660 CN200610079660 CN 200610079660 CN 200610079660 A CN200610079660 A CN 200610079660A CN 101072330 A CN101072330 A CN 101072330A
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Abstract
Purpose of the method disclosed in the invention is to solve issues the current closed circuit television monitor system (CCCTMS) faces to including distribution range of monitory points, system installation, maintenance cost, and performance of resisting environmental disturbance caused by technical limitation of signal transmission method. Characters of the invention are: signal transmission in closed circuit television monitor system is realized through ITU-T G.983 BPON, ITU-T G.984 GPON, and IEEE 802.3ah EPON; signal transmission is accomplished by three parts mainly: Optical Access Unit (OAU), Optical Distribution Network (ODN), and Optical Line Termination (OLT). Based on technical characteristic of passive optical network, the invention can solve issues CCCTMS faces to. The invention is especially suitable to application situation where large numbers of front ends are outdoors, and far away from control center of monitor system.
Description
Technical field
The present invention relates to closed-circuit TV monitoring system, particularly method for transmitting signals in the closed-circuit TV monitoring system.
Background technology
Comprise front end, transmission, rear end three parts on its function of closed-circuit TV monitoring system.Fore-end mainly is made up of video camera, The Cloud Terrace etc.; Hop then comprises signal cable and corresponding relay equipment; Rear end part then mainly refers to supervisory control system control centre.Traditional closed-circuit TV monitoring system mainly adopts coaxial cable transmission data, is limited to the coverage with the coaxial cable transmission signals, and this class closed-circuit TV monitoring system generally can only realize small-scale cctv surveillance.Under the situation of up to a hundred control points of needs and several square kilometres of monitoring ranges, adopt this class closed-circuit TV monitoring system of coaxial cable transmission signals, all there is huge problem aspect feasibility, construction and the maintenance cost of system.In recent years, along with the development of IP video (VIP:Video On IP) technology and the practicability of IP video camera (IP Camera), the network closed-circuit TV monitoring system becomes possibility.Be characterized in adopting the 100BaseT ethernet technology to realize the signal transmission of closed-circuit TV monitoring system, but, under no network trunk equipment situation, the effective propagation path of 100BaseT ethernet line also can only be limited to 100-200 rice, even adopting with optical fiber is the 100BaseFx ethernet technology of transmission medium, do not adopting under the expensive trunking situation, the intersegmental distance of its maximum web also has only 400 meters, the signal hop of this class network closed-circuit TV monitoring system between its front end and supervisory control system control centre needs a large amount of active network equipment, for the transmission network that adopts active equipment, environment electromagnetics is disturbed for it and the lightning protection condition also has higher requirement, therefore, making up this class closed-circuit TV monitoring system needs the place of certain condition, machine room and electric power system, in outdoor and away from the closed-circuit TV monitoring system of supervisory control system control centre, the construction cost that it is relevant and the maintenance cost problem of system itself can be very outstanding for the front end many places.
Summary of the invention
The objective of the invention is to propose a kind of closed circuit television monitoring system signal transmission method, because the technology of method for transmitting signals limitation and the problem that produced at control point distribution, system's installation and maintenance cost and anti-environmental interference aspect of performance, especially be in the open air in a large number and away from supervisory control system control centre when the front end of closed-circuit TV monitoring system to solve existing closed-circuit TV monitoring system.
For realizing purpose of the present invention, the present invention proposes with passive optical network technique, comprise G.983 BPON of ITU-T, ITU-T G.984GPON with IEEE 802.3ah EPON, realize signal transmission in the closed-circuit TV monitoring system, it is characterized in that light access unit (OAU:Optical Access Unit), these three parts of optical distributed network (ODN:Optical Distribution Network) and optical line terminal (OLT:Optical LineTermination) constitute the EPON hop of realizing the closed circuit television monitoring system signal transmission, video camera in the closed-circuit TV monitoring system front end, The Cloud Terrace, can link to each other with the light access unit of the front end that exists together by wired or wireless interface with other pilot signal transducer, behind the coding and electro-optical signal conversion process of pilot signal process necessity in the light access unit, via the optical distributed network that adopts Passive Optical Components pilot signal is sent to optical line terminal again, after in optical line terminal, finishing the electro-optical signal conversion process, gigabit networking interface by optical line terminal directly or again is sent to supervisory control system control centre via local area network (LAN) or wide area network, control signal is then from supervisory control system control centre, via optical line terminal, optical distributed network and light access unit arrive The Cloud Terrace to finish the control to rig camera.
Owing to adopted the EPON transmission technology to realize the closed circuit television monitoring system signal transmission, only the coverage of its passive optical network signal hop can just reach 20 kilometers, thereby increased distance between front end monitoring point and supervisory control system control centre greatly, and the optical port of each optical line terminal unit adopts the transmission mode and the time division multiple access way of point-to-multipoint, can be front end the upstream data bandwidth of 1.25Gbps altogether is provided.As the prefect dielectric network that adopts Passive Optical Components, the passive optical network signal hop of this class closed-circuit TV monitoring system only utilizes passive optical splitters (Splitter) to realize the distribution of luminous power, need not specific place, machine room, electric power system, with corresponding system maintenance, in addition, because signal adopts optical transmission, has also just avoided electromagnetic interference and effects of lightning.The topological structure of EPON can be supported network topology structures such as tree type, star-like, bus-type, mixed type, redundancy-type, thereby this class closed-circuit TV monitoring system equipment network is also very flexible, also can solve existing closed-circuit TV monitoring system in the problem that control point distribution, system's installation and maintenance cost and anti-environmental interference aspect of performance are faced, be particularly useful for that front end is in the open air in a large number and away from the application scenario of supervisory control system control centre.
Description of drawings
Fig. 1 is the functional block diagram of closed-circuit TV monitoring system in a kind of closed circuit television monitoring system signal transmission method of the present invention.(1) is rig camera among the figure; (2) be the light access unit; (3) be optical distributed network; (4) be optical line terminal; (5) be local area network (LAN) or Wide Area Network; (6) be the cctv surveillance center.
Fig. 2 is the functional block diagram of light access unit (OAU) in a kind of closed circuit television monitoring system signal transmission method of the present invention.(1) is the front end interface module among the figure; (2) be coding module; (3) be EPON (PON) protocol process module; (4) be the optical line interface module; (5) be native processor; (6) be power module.
Embodiment
With reference to Fig. 1, adopting passive optical network technique to realize in the closed-circuit TV monitoring system of signal transmission, the light access unit is used for fore-end, by wired mode, as coaxial cable, composite signal cable, Ethernet cable, finish and being connected of rig camera, The Cloud Terrace and other monitoring sensor.The light access unit that connects one or more rig cameras can be regarded a basic guarded region (cell) as.Each basic guarded region inserts optical distributed network by the EPON interface of light access unit, is connected to optical line terminal, constitutes the EPON hop of closed circuit television monitoring system signal transmission.Optical distributed network comprises that fully by Passive Optical Components monomode fiber (SMF:Single ModelFiber) and branch light path device constitute.Optical line terminal is as the optical transmission terminal equipment of closed-circuit TV monitoring system, its each EPON optical port adopts the transmission and the access module of point-to-multipoint, descending employing broadcast mode provides and is up to the 2.5Gbps data bandwidth, and the up time-division access way that then adopts provides the data bandwidth that is total up to 1.25Gbps for each front end.Except finishing the data sending and receiving, optical line terminal also provides the condition monitoring of the registration management of each light access unit, TV monitoring and controlling channel data allocated bandwidth, light circuit and reports to the police and handle.Optical line terminal can directly link to each other with the local monitor System Control Center by its gigabit Ethernet mouth; Perhaps, optical line terminal also can be used as one of aggregation node in the supervisory control system, by its gigabit Ethernet mouth access to LAN or wide area network, finally is connected to the supervisory control system control centre that is positioned at far-end.Technology according to IEEE 802.3ah EPON, in the closed-circuit TV monitoring system that adopts passive optical network technique, the passive optical network port of each optical line terminal can connect 32 basic guarded regions by optical splitter, if adopt G.984 GPON technology of ITU-T, the passive optical network port of each optical line terminal can reach 128 by the attachable basic guarded region number of optical splitter.Like this, be the basic guarded region at center if adopt an optical line terminal with 4 GPON optical ports just can connect and manage 512 with the light access unit.As required, in the closed-circuit TV monitoring system of an employing passive optical network technique, can support the closed-circuit TV monitoring system of different scales with a plurality of optical line terminals with one or more optical ports.
With reference to Fig. 2, the core of light access unit (OAU) is the passive optical network protocol processing module, and its interface module is used to provide the signaling interface with rig camera, monitoring sensor and The Cloud Terrace.This interface module comprises video-audio signaling interface, serial/parallel capable control signal interface and Ethernet interface.The rig camera interface can be synthetic (Analog Composite) interface of simulation, AV interface, S-Video interface, USB interface or IEEE-1394 interface.The IP video camera then can link to each other with the light access unit by Ethernet interface or WiFi wave point.Signal encoding module in the light access unit then is used for finishing the compressed encoding to analog audio/video signal, and the signal encoding standard of being supported comprises M-JPEG, MPEG1, MPEG2, mpeg 3, MPEG4, H.264, H.263, G.722 and G.728.Native processor in the light access unit is used for realizing the control and the management of each module of light access unit.Power module is used to the power supply of light access unit.The EPON interface is then realized an optical port based on passive optical network protocol.
Claims (2)
1. closed circuit television monitoring system signal transmission method, it is characterized in that with passive optical network technique, comprise ITU-T G983 BPON, ITU-T G984 GPON and IEEE 802.3ah EPON, realize signal transmission in the closed-circuit TV monitoring system, light access unit (OAU:Optical Access Unit), these three parts of optical distributed network (ODN:Optical Distribution Network) and optical line terminal (OLT:Optical Line Termination) constitute the EPON hop of realizing the closed circuit television monitoring system signal transmission, video camera in the closed-circuit TV monitoring system front end, The Cloud Terrace, link to each other with the light access unit of the front end that exists together by wired or wireless interface with other pilot signal transducer, behind the coding and electro-optical signal conversion process of pilot signal process necessity in the light access unit, via the optical distributed network that adopts Passive Optical Components pilot signal is sent to optical line terminal again, after in optical line terminal, finishing the electro-optical signal conversion process, gigabit networking interface by optical line terminal directly or again is sent to supervisory control system control centre via local area network (LAN) or wide area network, control signal is then from supervisory control system control centre, via optical line terminal, optical distributed network and light access unit arrive The Cloud Terrace to finish the control to rig camera.
2. a kind of closed circuit television monitoring system signal transmission method according to claim 1, wherein described smooth access unit (OAU) is characterized in that having closed-circuit TV monitoring system front end watch-dog interface, signal coder and EPON interface.
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| CN 200610079660 CN101072330A (en) | 2006-05-09 | 2006-05-09 | Closed circuit television monitoring system signal transmission method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006454A (en) * | 2009-09-01 | 2011-04-06 | 中国电信股份有限公司 | Method and system for implementing video monitoring service in GPON network |
| CN103152413A (en) * | 2013-03-01 | 2013-06-12 | 瑞斯康达科技发展股份有限公司 | Transmission method and system of data in passive optical network |
| CN103179376A (en) * | 2011-12-22 | 2013-06-26 | 洛阳希诺能源科技有限公司 | Anti-theft monitoring device for cable TV network |
| CN114667051A (en) * | 2022-05-25 | 2022-06-24 | 绍兴中科通信设备有限公司 | Anti-interference optical module |
-
2006
- 2006-05-09 CN CN 200610079660 patent/CN101072330A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006454A (en) * | 2009-09-01 | 2011-04-06 | 中国电信股份有限公司 | Method and system for implementing video monitoring service in GPON network |
| CN102006454B (en) * | 2009-09-01 | 2013-04-17 | 中国电信股份有限公司 | Method and system for implementing video monitoring service in GPON network |
| CN103179376A (en) * | 2011-12-22 | 2013-06-26 | 洛阳希诺能源科技有限公司 | Anti-theft monitoring device for cable TV network |
| CN103152413A (en) * | 2013-03-01 | 2013-06-12 | 瑞斯康达科技发展股份有限公司 | Transmission method and system of data in passive optical network |
| CN103152413B (en) * | 2013-03-01 | 2016-02-03 | 瑞斯康达科技发展股份有限公司 | The transmission method of data and system in a kind of EPON |
| CN114667051A (en) * | 2022-05-25 | 2022-06-24 | 绍兴中科通信设备有限公司 | Anti-interference optical module |
| CN114667051B (en) * | 2022-05-25 | 2022-08-30 | 绍兴中科通信设备有限公司 | Anti-interference optical module |
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