The optical fiber market to force copper prices soaring difficult to drop
As a normal data transmission, of the types there are many; in the video surveillance, image and video data is particularly important, of course, its means of transmission are not the same. In particular, is also facing a melee when the digital monitoring and analog controls are not yet command the security market, coaxial cable, twisted pair, fiber and other transmission media. It is said that the coaxial cable is still monitoring the market mainstream wire; Some people say that fiber is the high-definition transmission benevolent. Either transmission, which transmission wire, we should adopt in the face of the different needs of different transmission media.
The optical fiber market to force copper prices soaring difficult to drop
First, we look at both market trends. February 8, China Unicom announced ADSL and fiber optic users can enjoy free high-speed bandwidth of 10M and 20M, in the case of the same tariff packages to improve network bandwidth, but also a gospel of disguised price cuts. Although the fiber cost is high, but when the network environment is ripe, the optical fiber transmission can not only reduce the cost of the monitoring system, but also to protect the transmission effect. When the fiber market is frequently broadcast the good news, the coaxial cable market then? According to the latest news on the 8th, copper prices continued high and volatile, reported $ 3.9 / lb. It seems that in a cost point of view, the copper market outlook is bleak. For monitoring transmission problems, the author also interviewed a Contractors friends, he said, the current transfer market is mainly fiber-based copper cost is too high already in half-elimination stage. However, according to the different needs of users and laid monitor the different characteristics of the coaxial cable is still in use, but the cost of the project will slightly improve.
Coaxial cable really will be brought to its knees since then retreated into the shadows? The answer of course is no. When the coaxial cable is facing a market crisis, the HD-SDI and coaxial cable security link product was born. HD-SDI to solve the problem of the quality of the coaxial cable transmission, but the HD-SDI support products must be of high quality products, high product cost. In short, mature network environment, a bright market prospects of the optical fiber transmission, coaxial cable due to cost issues, a slight obstruction.
HD transmission quality decision to monitor the transmission medium
HD transmission quality decision to monitor the transmission medium
When the growing popularity of high-definition monitor, in addition to high-definition surveillance cameras, high-definition transmission has also become a key factor in determining image quality. Different transmission media, its output quality is also different. First, we look at the effect of SD to HD transmission: SD transmission using analog signals, bandwidth is 6M, 75-5 coaxial cable that can be transmitted without loss of quality 100m; to the HD era, 1080p images need bandwidth of 27M the bandwidth of SD of 3.5 times, theoretically transmission distance is less than 30m in the coming high-definition monitor, you believe that coaxial cable can continue the important task?
In fact, both the optical fiber or coaxial cable, the image transfer process, there will be attenuation. These data suggest that there will be varying degrees of attenuation in the transmission of different images, according to the bandwidth and transmission distance. Especially the last two years, copper prices growth, the transmission on the market such as copper clad aluminum products. Copper is responsible for transmission, the external aluminum is responsible for shielding interference. In the era of high definition digital signals, the combination of HD-SDI technology with coaxial cable to solve some of the interference problem, and did the frequency compensation function, the transmission distance was extended to 100m
Rely on the optical signal optical fiber transmission characteristics in its long-distance transmission has the advantages that can not be ignored; fiber band 1.25G and 2.5G, 1080p, 30 frames / second image signal bandwidth is = 1920 × 1080 × 16 × 30 = 995.328M approximation 1G, rated less than the fiber band, fully able to meet the high-definition monitoring requirements. In fact, careful people will find that the frequency of the HD-SDI interface, up to 1.48G, the theoretical data on high-definition images requires, but it requires the internal adapter, a lot of limitations in the high-speed ball and infrared cameras. HD-SDI coaxial cable, high-definition transmission, also encountered a bottleneck.
3: why mitigation monitoring transmission environment
When the optical fiber transmission encountered the high cost of short-range when you encounter a problem when the coaxial cable, twisted pair transmission seems to be a popular product of the surveillance market. SD transmission and coaxial cable has the same drawbacks, but due to its combination of "two-lane combination" splitter transmission, offset by the high frequency attenuation; along with its inherent anti-jamming capability. predominate in the network signal transmission.
Snipe and the clam play off "the story we have heard, when the coaxial cable and fiber optic played inseparable pay the emergence of the twisted pair will cause the" ancients "and" concerned about it? When the two generations can not be achieved completely supersede and replace the new generation of products may solve the immediate need. The author believes that the twisted pair is currently monitoring the transmission of a transitional product, the transmission medium is still not changed, a new breakthrough in the transmission.
I survey found that the current monitoring system, the use of "hybrid" transmission is more common. Erection of the optical fiber communication in the mature network environment, a wide range of high-bandwidth communications; the short distance within the coaxial cable baseband transmission, and reduce costs; In addition, there is more demand user can also use the computer network protocol transmission, image compression, using a network cable.
Monitor the transmission when the fiber encounter a coaxial cable, we are unable to tell who is winning, but we have made clear their applications and their own characteristics. HD-SDI became popular in the future, when fiber-optic transmission to solve the short-range transmission, copper reduce the cost of all technologies are superior, and perhaps monitor the transmission has been achieved wireless. Monitoring the Future, transmission and more exciting.
