Analyze the transmission distance between IP, HD-SDI and analog HD
There are three kinds of high-definition, IP high-definition, SDI high-definition, and analog high-definition. In the three types of high-definition format signal transmission, there may be some distance and conversion problems that cannot be overcome.
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Generally speaking, when comparing IP HD and HD-SDI HD, operators or engineers often use HD-SDI or analog distance to explain the advantages and disadvantages of IP and HD-SDI, but with the author's experience in engineering applications, There is really no need to use these three types of transmission distances and the last video format as obstacles for system integration in the high-definition surveillance requirements, and under a high-resolution common goal, there is no need to be stuck in the selection due to transmission problems. .
In fact, in the current large-scale monitoring project, due to the rapid development of optical fiber communication technology, the cost of optical fiber transmission monitoring system is greatly reduced, so the application of optical fiber and optical transceiver in various high-definition monitoring systems is becoming more and more popular. At present, the investigation found that optical fiber has been widely used in various industrial monitoring systems. In addition, in the monitoring system HD-SDI signal transmission, generally short distance (about 100-200 meters) can be mostly transmitted by coaxial cable; can also be added to the repeater (Booster) way to extend the transmission distance to 400- About 500 meters. In the case of long-distance transmission in the network architecture, the most common is that HD-SDI is converted to fiber-optic cable transmission through the optical transceiver of Fiber, and in order to meet the one-way or two-way transmission of multiple HD-SDI signals, the optical transmission architecture also has Multi-channel optical wavelength division method transmission such as WDM/DWDM/CWDM achieves more than one HD-SDI or analog image fiber signal transmission transmission requirement, which can make analog and HD-SDI camera signal transmission reach 30-70 Kilometers.
Such transmission applications are in principle comparable to the distance traveled by the network. This architecture based on fiber-optic networks, supplemented by the Internet and coaxial, has been widely adopted in surveillance engineering, and this The architecture maximizes cost savings and reduces the impact of bandwidth on IP or HD-SDI HD video transmission.
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