By PURPLELEC | 17 June 2024 | 0 Comments
How far can SDI signals actually be transmitted?
SDI is mainly divided into three types of SDI signals: 3G, HD, and SD. Compared with other high-definition audio and video signals, SDI has a longer transmission distance and is widely used in radio and television. The theoretical transmission distance of SDI can generally be transmitted from 100 meters to 300 meters. Of course, the transmission distance of SDI signals output by different devices is different, and it is also different from the SDI cables used for transmission.
Indeed, different manufacturers have specified the transmission distance of SDI, and usually this distance is measured by the manufacturer under certain conditions. There must be differences in actual applications.
Usually, there are no special restrictions for SD-SDI. It is normal to use less than 200M. For general equipment, this distance can be achieved.
For HD-SDI, the same 200-meter application is not achieved by every device and every cable.
In theory, there is no problem with HD-SDI signal transmission of 200 meters. Why can't some devices and cables reach it? This is because SDI signals are serial signals. The biggest obstacle affecting serial signal transmission is the bit error rate of the signal. For short distances, because the signal quality is good, the bit error rate is relatively small.
For long distances, the transmitter requires standard signal amplitude and good quality (such as jitter). On the other hand, the signal loss caused by the wire must be small. Furthermore, the receiver is required to have the ability to recover from weak signals. If there is a problem in any of these three aspects, the distance may be reduced.
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