Low-cost passive optical network for video monitoring

A passive optical network and video surveillance technology, applied in the field of passive optical networks, can solve the problems that the performance cannot be well guaranteed, the video data bandwidth is greatly affected, and the algorithm wastes the cost, so as to save the network cost and improve the transmission. The effect of distance, good upgradeability

Active Publication Date: 2013-09-25
ZHEJIANG UNIV OF TECH
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Problems solved by technology

Therefore, it will inevitably bring about the waste of the algorithm and the extra cost
[0006] (3) EPON user data is encapsulated in Ethernet frames, IP packets, and TCP / UDP packets, which has a large overhead and has a great impact on the bandwidth of video data
And EPON has no constraints on video transmission quality QoS
[0007] In short, if EPON or GPON is used for video surveillance transmission, the overall implementation cost of the system is high and the performance cannot be well guaranteed

Method used

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  • Low-cost passive optical network for video monitoring
  • Low-cost passive optical network for video monitoring
  • Low-cost passive optical network for video monitoring

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[0027] The present invention will be further described below in conjunction with the accompanying drawings. Suppose there are N ONUs in the network (N=16, 32, 64, 128, etc.).

[0028] A low-cost passive optical network for video monitoring, characterized in that: the network topology is a star or tree structure, including an optical line terminal OLT, and the optical port of the OLT network is connected through a single G.652 optical fiber To one or more optical ports of the passive optical splitter, the passive optical splitter is connected to the optical ports of multiple optical network units ONU or other passive optical splitters through multiple G.652 optical fibers at the splitting port An optical combining port of the beam splitter, and the ONU is connected to an optical splitting port of the passive optical beam splitter through a single G.652 optical fiber.

[0029] The internal structure of the OLT is that the electrical signal output of the pulse generator is conne...

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Abstract

The invention relates to a low-cost passive optical network for video monitoring. The low-cost passive optical network for video monitoring is suitable for a point-to-multipoint star-shaped and tree-shaped topology networking video monitoring network requiring low cost. An optical signal with the central wavelength being 1550nm is adopted in the network to conduct time division duplex communication, downlink light sent by an OLT carries a small number of control data, a great number of the control data is load, an RSOA reflection-type semiconductor optical amplifier is used in each ONU for modulating data such as uplink video; the distribution mode that a TDMA is accessed and a uplink bandwidth is relatively fixed is adopted among a plurality of ONUs; various control frames and video frames (BT.656 standard of an ITU-R, the resolution ratio is a 4CIF (704*576) format uncompressed video bitstream ) are all encapsulated according to a IEEE802.3Ethernet format.

Description

technical field [0001] The invention relates to a passive optical network (Passive Optical Network, PON) solution for multi-front-end video monitoring signal transmission, which is suitable for point-to-multipoint star and tree topology network construction and requires low-cost video monitoring networks. Background technique [0002] With the security needs of modern cities to build "safe cities", video surveillance has become more and more important. Usually there are hundreds or even thousands of monitoring points in an area. To ensure that functional departments can grasp real-time, clear and high-quality video images at the first time, it highlights the shortage of optical fiber resources. PON (Passive Optical Network) technology can solve this problem well. It can give full play to the bandwidth advantage of optical fiber, solve the shortage of optical fiber resources, and improve the robustness of the network. A passive optical network includes an optical line termin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04L12/44H04N7/18
Inventor 温浩任宏亮常丽萍吴哲夫
Owner ZHEJIANG UNIV OF TECH
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