1 Introduction
LED is widely used in landscape lighting of large and medium-sized cities in China because of its energy saving, long life, high reliability, rich color, easy control (fast response, easy non-standard design and long span control). In the Beijing Olympic Park, the “Water Cube†(National Aquatics Center) at night is exquisite and exudes a fascinating blue glow. The “Water Cube†landscape lighting project uses LED lighting. It is estimated that the traditional fluorescent lighting can save 745,000 kWh and save energy by more than 70%.
The LED is rich in color. In theory, only the LED light source can completely cover all the saturated colors in the CIE chromaticity curve. That is, the LED can produce almost any color through the organic combination with the phosphorus; the LED can be powered by low-voltage DC, and the dimming is convenient, so The field of landscape lighting has the advantage that other light sources cannot match.
At present, integration of management and control is a key technology for lighting energy conservation. In accordance with the appropriate control strategy, the LEDs are programmed and controlled according to the overall requirements of the environment. Through the coordination of LED light colors, the overall artistic landscape effect can be produced. The application of the integrated control technology in LED landscape lighting is introduced below based on practical applications.
2. LED landscape lighting control integrated intelligent control system
LED landscape lighting control integrated intelligent control system includes two parts of equipment supervision and intelligent control. The monitoring of field equipment mainly realizes intelligent control of lighting circuit, lamps, anti-theft, online fault diagnosis and alarm. The intelligent control of LED landscape lighting is a key part that is different from other integrated control systems. The intelligent control strategy can fully reflect the advantages of LED in landscape lighting, and it is an effective means to realize the design idea of ​​landscape lighting designers.
2.1 Equipment Monitoring
2.1.1 Intelligent controller / drive installation location
The integrated control system of the control system is equipped with an intelligent controller at the line terminal. The intelligent controller/driver is installed at different locations depending on the actual needs:
a. An intelligent controller/driver is responsible for the management of one/multiple loops, monitoring of multiple lighting devices, theft prevention and data transmission. This solution is suitable for places with a large number of lighting devices and relatively concentrated.
b. Install an intelligent controller/driver for each fixture. It can automatically detect unexpected events such as protection trip, line fault, voltage fluctuation, abnormal switch control, and upload the alarm data to the monitoring center in time through the communication module inside the controller, so that the on-duty personnel can understand the situation in time and make a deal. This solution is suitable for places where the number of lighting devices is small and relatively dispersed.
2.1.2 Anti-theft problem
Anti-theft is a major problem facing the current landscape lighting project. Most of the landscape lighting facilities are outdoors, and the surrounding people flow greatly, which brings great difficulties to the anti-theft work. The intelligent controller of the line terminal of the integrated control system can easily play the role of anti-theft:
a. Design tamper switch for lamps and distribution boxes, monitor and detect electrical signals through intelligent controllers, and link with alarms.
b. Design the glass broken vibration switch inside the lamp, monitor and detect the electric signal through the intelligent controller, and link with the alarm. In addition, it can be monitored by a remote video surveillance system to establish a system that combines remote monitoring with personnel patrol.
LTE CAT4/CAT6 Definition
The full name of LTE CAT is LTE UE-category, which is broken down to explain :LTE refers to 4G LTE network, UE refers to user equipment, and Category is translated as level. Smooth interpretation is the level of 4G LTE network transmission rate that user devices can support, which can also be said to be a technical standard for 4G network speed. Therefore, LTE CAT4/CAT6 means that the user device LTE network access capability level is 4 or 6.
Since the level is different, then its capabilities are certainly not the same, let's take a look at LTE CAT4/CAT6 affect what performance, respectively, what level. Simply put, LTE CAT affects the upper limit of 4G LTE uplink and downlink network speed, which is generally referred to as the maximum upload and download speed that a user device can achieve.
There are not only 4 and 6 levels in LTE CAT, but the table above is our list of currently known LTE CAT levels and the corresponding maximum transmission speed. Among them, LTE CAT4/CAT6 is also the current network transmission technology level of 4G mobile phones, while the faster CAT7 and CAT8 are still in the laboratory stage and have not been commercially developed.
Phones and chips that support LTE CAT4/CAT6
As far as the current 4G mobile phone market is concerned, most mobile phone products are CAT4 technology, and only a small number of new mobile phones use CAT6 technology, such as Huawei Honor 6, Samsung Galaxy S5 advanced version and LG G3 Cat6, and the concept of LTE CAT6 is proposed by Huawei Honor 6.
For the mobile phone LTE CAT4/CAT6 standard, it is directly linked to the mobile phone chip, or, if you know the processor of the mobile phone, you know which technology the mobile phone uses. For the current 4G mobile phone chips, only Huawei Kirin 920 and Qualcomm Snapdragon 805 processors for LTE CAT6, before this 4G chips are LTE CAT4, the future and Kirin 930, Qualcomm Snapdragon 808/810 will support LTE CAT6. Mediatek won't have LTE CAT6 chips until the second half of next year.
Qualcomm Snapdragon 805, 808, and 810 also support LTE CAT6
It is worth mentioning here that Qualcomm Snapdragon 805 and Kirin 920 are not the same in chip design, the LTE CAT6 baseband of Snapdragon 805 is an external Gobi MDM9x35, while Kirin 920 is a direct SoC integration, and the chip is integrated, this point Kirin 920 has ultra-high integration. It has certain advantages in power consumption and cost. As a leading international communications company, Huawei's strength can not be underestimated, but also the pride of our people.
The actual use value of LTE CAT6
Upload, download speed is our use of mobile Internet access the most concerned performance, but it should be clear that the LTECAT standard is the 4G transmission speed limit, and can not improve the transmission speed, in the operator's 4G network speed has not reached the next standard, simply raising the limit is meaningless. At present, the 4G networks of domestic operators are all LTE CAT4 standards, and the peak download speed is 150Mbps, but it is difficult to reach the upper limit of LTE CAT4 in practical applications, and even to reach 100Mbps is very difficult, so at this stage LTE CAT6 has no use value.
In terms of real life applications, LTE CAT6 is not as beautiful as we think. We can do a calculation, according to the formula 1MB/s=8Mbps, the maximum download speed of LTE CAT4 is 18.75MB/s, such a download speed, for 1080P video online playback has no pressure, even 4K online film source still can not occupy such a large bandwidth, So LTE CAT6 has no use either.
To sum up, LTE CAT6 does not have much use value at this stage, and the term is only a gimmick of manufacturers, until the operator 4G standard reaches LTE CAT6, I believe that LTE CAT6 equipment has long been popular. So as for whether the phone is LTE CAT4 or LTE CAT6, you don't have to care.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.szmovingcomm.com