end feed Bronze Fittings is designed according to kembla and connex type .but the quality is same as kembla bronze fittings and coneex bronze fittings,End Feed Bronze Fittings,end feed gunmetal fittings,kembla bronze fittings,connex bronze fittings End Feed Bronze Fittings,end feed gunmetal fittings,kembla bronze fittings,connex bronze fittings Taizhou Runde Company , https://www.zjpressfittings.com
Network data transmission in elevators
There are many digital signals in elevators that are transmitted through the network, such as video surveillance, advertising screens, and smart integration. However, the elevator is a special use scenario. The elevator runs up and down frequently and the cable is easily broken.
Several methods that are currently used have different levels of deficiencies, such as the network cable is not enough, easily broken; wireless penetrating power is weak, distance is short; the optical fiber is not bent and so on. Therefore, it has been thought that the network data transmission of elevators has become a rather troublesome issue and there is no good idea.
Inadvertently, there is a new product, digital network transmitter, using video lines, dual cores can transmit network signals, and far away, far away.
For example, as a network camera image in security monitoring, back to the surveillance room, there can be such a move:
In the elevator's accompanying cable, there is either a coaxial line or a dual-core cable that can be used for transmission.
In the same situation, if it is necessary to deliver advertisements to the advertising screen in the elevator, it is also possible to return the network signal through the network transmitter:
If so, the network signal collection of other elevators can also be accomplished through a network transmitter.
Then, compared to network cables, wireless and optical fiber transmission methods, what are the special features of network transmission devices?
We make a simple comparison, one characteristic of the cable is the short distance, only the limit of 80 meters, there is a certain limit for the network transmission of the elevator, at least 20 floors above the elevator can not use it, the more deadly point is that the core With the continuous operation of the elevator up and down, so many wire core network cable is easy to break, causing transmission failure. Therefore, it is less used.
Wireless? It is necessary to install a wireless transmitter at the top or bottom of the elevator, and then install the receiver at the top or bottom of the hoistway. Not to mention that the installation of this equipment is more complicated, it is said that the wireless signal is easily affected by electromagnetic waves when the elevator starts and the distance is different. There are differences, all of which will cause instability to the wireless. In particular, after a certain period of application, the general signal will be reduced to a common problem. This is a fact that users who use it are fully aware of it. Therefore, it is rare to see.
Let's talk about optical fiber, ordinary optical fiber is not available on the elevator, how can the glass core withstand the ups and downs of the elevator? However, there is a new type of plastic optical fiber that may be used. The use of optical fiber is a problem. Fusion welding is a problem. It takes a long time to replace the plastic optical fiber. Once again, the fusion welding may not be very satisfactory. In addition, the cost is high. Therefore, Not commonly used.
The above three kinds of transmissions are not the best. Therefore, the three points of the world are all in use and cannot be forced.
Digital network transmitters, which use video cables and two-wire cables, are redundant cables in the elevator's necessary accompanying cables. They do not require re-wiring and do not require special installation. They are simple and efficient to use. .
The most important thing is that the network speed is guaranteed, stable at a speed of 60 MPS/S, and the distance is at least 300 meters and the maximum distance is 1,000 meters. Which of the above three methods can afford it?
Only the products belong to new products. There are not many people who know and few people know. In time, the network signal transmission of elevators is definitely the time for digital network scanners.