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Can fiber optic solve the bandwidth problem of HD network monitoring? by guard summer
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Can fiber optic solve the bandwidth problem of HD network monitoring? by GUARD SUMMER
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| Article Posted: 07/02/2014 |
| Article Views: 320 |
| Articles Written: 129 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 1305 |
| Article Votes: 0 |
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Can fiber optic solve the bandwidth problem of HD network monitoring? |
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Business,Electronics,Science & Technology
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We know that the traditional standard definition monitor is divided into analog, digital, and three types of networks. Analog front-end analog surveillance cameras, the back end is the matrix. Analog front-end digital cameras also monitor backend is DVR. There are two front-end network monitoring, an analog camera video encoder, a network camera, the back end is the monitoring and management platform. The current CMOS-based sensor for high-definition video, CMOS sensor output directly digitized video signal in the camera through the DSP or ASIC digital high-definition video signal directly to this compression encoding, and then transmitted to the network, the camera than the direct output HD signals more convenient and more efficient process. HD network camera provides clear visual experience to the people, but also a higher network bandwidth requirements. To get large-scale application, in addition to the passive network operators expect to make some adjustments, but also need to take some proactive alternatives to alleviate HD cameras transmit broadband network is not enough contradictions. Active use of advanced video compression standard, to ensure the least amount of data used to achieve the best image quality, but through a combination of image coding technology and intelligent technology, using a local coding method can reduce the transmission of high-definition images require a considerable degree network bandwidth. Currently, there are three mainstream compression format, which are JPEG, MPEG-4, H.264. JPEG is a compressed single frame of the picture, the effect of a single picture of the best, but the larger network bandwidth occupied; MPEG-4 and H.264 compression consecutive frames and frames. One of the most popular compression format H.264 highest compression efficiency through H.264 compressed video data transmission in the network bandwidth required for less. While achieving high local video, using dual stream technology can both reduce bandwidth usage and ensure local long-distance transmission of a better image quality. HD cameras in remote monitoring environment that provides all the way to high-bit-rate HD stream for local storage, such as 720P/1080P coding, all the way to low bit rate streams for network transmission, such as QCIF / CIF encoding, taking into account local storage and remote network transmission. According to the network bandwidth flexibility to choose bitstream format, to local HD storage, while the back-end network transport low stream. Can in the limited network resources users can get the case to ensure the stable operation of the transmission system. Intelligent technology can improve monitoring efficiency, it can bring value more than that, through the analysis of pre-coding and intelligent embedded intelligent analysis module definition network camera can capture valuable information from the source and then spread to the background, can reduce the transmission of pressure, truly effective transmission. HD network camera to capture the image itself can be analyzed to determine, and the alarm signal is transmitted to the back-end system, which is different from the previous intelligence technology to transfer images to a back-end system and then the alarm mode analysis carried out by the software. The conventional approach requires taking up too much bandwidth and storage space, and since the image signal exists in the transmission loss, prone to false alarms. The HD cameras since all signal processing in the internal front camera, the signal is the most complete, so greatly enhance the accuracy of the alarm, while reducing bandwidth. Rational design front-end caching technology to ensure the device image is not lost. HD camcorder itself limited data storage capacity, depending on the communication transmission and back-end storage devices. Data can be lost when we designed front-end caching mechanism to prevent communication failure. For example, in the design of high-definition camera system, optional on-board memory or other storage devices, and support for offline work. In the case of abnormal network interruption can be local, such as the network returned to normal after temporary storage of data back to the server. But also through network technology, network temporarily interrupted when the front-end cache, and automatically upload recorded data upon network recovery, thereby ensuring the integrity of the recording. Monitoring market is necessary to unite the various manufacturers, some of the prevailing norm, seek common ground while reserving differences. Present situation makes Onvif, PSIA and other standardization organizations see video products and systems standardization hope. Video surveillance "plug and play" era believed not far off. For monitoring network traffic has driven the popularity, but also suffering from network bandwidth constraints, large-scale long-distance transmission performance suffered in the test project, based on the current specifications megapixels HD 720P computing, stream about D1 2 times the bandwidth of about 4M, taken 1080P calculations stream D1 is 5 times, and the bandwidth is about 10M. To 100M Ethernet, for example, under the premise of ensuring smooth, in fact, around the same time can only carry 5-way high-definition images, but if the same video source has multiple user access, the bandwidth will be even greater. Gigabit Ethernet switch can take dozens of roads, for small-scale high-definition surveillance system that can effectively solve, for large projects, the transmission performance will become a stumbling block. In recent years, the rapid development of optical fiber communication technology allows optical transmission monitoring systems significantly reduce the cost of optical fiber and Optical applications in monitoring system is becoming increasingly popular. Fiber has been widely used in homes and offices fiber access network, home field of intelligence, office automation, industrial networking, automotive and military airborne communications network in. For the transmission bandwidth, transmission distance requirements for high-definition video streams, in the era of high definition optical fiber monitoring is no longer a dream. Optical fiber transmission characteristics make fiber transmission medium of choice for digital high-definition signals. Optical fiber transmission also has the following advantages: a wide band optical fiber, up to 30 trillion Hertz theory can guarantee bandwidth and quality of digital high-definition signal. Is the traditional copper cables simply can not match. This makes it an ideal base fiber technology for high bandwidth data transmission. The use of traditional cable transmission of digital high-definition signal, but the effective distance of several hundred meters, and optical fiber can transmit hundreds of meters or even tens of kilometers away. HD signal for reducing communication costs and improve the reliability and stability of particular importance. Fiber is an insulator material, it is not lightning interference in nature, changing the ionosphere disturbances, without electromagnetic fields and electromagnetic radiation, the fiber provides a clearer signal than copper; light in fiber optic transmission process is difficult from the fiber leak out. Thus, even if a lot of the total fiber in the cable can also be realized without crosstalk, outside the cable, tapping into the fiber can not transmit information. Its tensile strength, low mass, and relatively small, so the cable wiring to maximize utilization of the pipeline expansion, and can reduce installation problems as possible. By following figures we can analyze the advantages of the fiber, 1000 1km long twisted pair weighs 8000kg, while the larger capacity 1km-long weight of only 100kg weight of two optical fibers, which greatly reduces the need to maintain the system requires expensive mechanical support, the optical fibers to be better than copper. Optical fiber as a transmission medium for system expansion capability is very strong, due to the very wide passband fiber and chemical resistance, long service life. After the formation of the investment once the physical link, the system can be upgraded and expanded on the basis of the original link, simply replace the equipment part of it, without having to replace the existing fiber optic network. Significant cost savings to upgrade the system. Fiber-optic transmission technology in order to meet future needs provides unparalleled flexibility and scalability. Fiber can provide much higher bandwidths than copper, which makes it more and more used to transmit video signals, the computer signals and high-definition signals. Fiber-definition video surveillance technology provides the best solution.
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HD network camera, fiber optic, network monitoring,
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