Twisted Pair Transmission And Contrast Advantages And Disadvantages Of The Wirel
Goes without saying that the screen to the player, the best end and video extensions, which are known to everyone, but when comes down to practice them, the back-end digital signage network connectivity has become a very difficult problem, the first deployment for the users, this has become a big issue perplexing.
Although there is now a personal computer or media player to the video screen custom extension methods and the corresponding configuration, but most of the transmission of video content or in the form of analog and digital signals for transmission via Cat5 cable . According to different application characteristics, we cited a wireless or wired connection with their respective advantages and disadvantages.
ANALOGANDDIG IT ALOVERUTP analog and digital transmission scheme of the non-shielded twisted pair
The solution is through unshielded twisted pair Cable (UTP) cable into the video distribution, including Cat5, 5e, 6,7, etc., are all copper Cable . Computer or media player output VGA video signal to UTP transmitter, the transmitter signal into a voltage signal higher, and through UTP cable to extend the transmission. In general, red, green, blue video signals are carried by different UTP cable transmission, the rest of the twisted pair is used for auxiliary signals, such as walking through or audio. The other end of the cable, UTP Receiver is responsible for converting the received VGA signal sent to the screen.
Analog and digital signal transmission is the transfer form is the difference between different analog video is a small electrical pulses through the cable, and digital receivers to receive the signal can be converted into 1 and 0 for transmission.
Advantage This cable solution, especially in analog signal transmission on the implementation of the most important advantage is that it is relatively cheap. Cat5 cable applications are becoming increasingly widespread, especially in the receiver and transmitter cost is gradually decreased, so that such wire transfer is one kind of price is very reasonable solution.
“In the PC hardware and maintenance done to streamline costs, these devices will also be extended to provide a very real and effective return on investment”, Avocent’s vice president and product Marketing Manager ChuckPheterson it said.
Cable transmission also allows the user to send HD Xi-degree video, transmission distance can be very far in the 2000 feet, 1080i and 1080p formats can all be compatible.
“You can also single Cat5 cable to support a variety of signals”, Minicom Digital Signage North America Managing Director DaveHaar said of, “which means you can video, audio, and manage bi-directional RS-232 , are also carried by cable. ”
Shortcomings Although this wired solutions have been very popular, there are still some limitations in the application, we need more restrictions, only by addressing these issues in order to better and implemented in accordance with.
First, the use of Cat5 cable for analog signal transmission may occur when the phase lag or ghosting. This is a situation may arise because of the use of cable in the four standard UTP cables and different cable lengths and different lengths will result in different colors signal reaches the receiver at different times, makes the video display fuzzy.
Second, this model also best not to wire the analog signal transmission between the two buildings. “If this connection is established between two different buildings, there will be two different ground source, grounding will be different, this will result in the transmission through the Cat5 cable to become a difference”, Pheterson say “Because the voltage drop between the two ground even more than 100 volts, which can lead to extended delivery device overload, or even cause failure.
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