EMU wireless monitoring system based on GPRS
With the increase of train running speed, it is of great significance to implement train monitoring. The use of computer communication technology and GPRS technology (general wireless packet service) to realize the system monitoring of trains is mainly for online detection of factors affecting driving safety, centralized display, storage and fault alarm of information, and historical data query. The wireless transmission of data and the sharing of resources are realized through GPRS, which more effectively guarantees the safe operation of the train.
solution
Adopting Helicomm's MA8 series GPRS wireless data transmission terminal (DTU for short) and the sensors installed on the front of the train, such as temperature sensor, speed sensor, power sensor, etc., are connected through RS232 / 485 interface, and the collected data is uploaded to the GPRS wireless data transmission terminal and Internet The remote center end, through the collected data to understand the current status of the train in real time, and can send data to the controller in the train head to control some equipment, such as air conditioning and lighting in the car.
GPRS (General Packet Radio Service) is a data transmission technology based on the global mobile phone system (GSM). It has a wide coverage and is suitable for long-distance data transmission of trains. The MA8 series GPRS DTU independently produced by Helicomm Company is powerful and has always online , Data triggering, SMS backup, remote modification, central call, support for fixed and mobile IP and other functions, reasonable and effective use of network resources, the system is stable and reliable.
Why choose Helicomm
1. MA8 series GPRS DTU is powerful and has strong adaptability to customer needs.
2. MA8 series DTUs have multiple interfaces of RS232 / 485 / Ethernet port, and the system is flexible to set up.
3. The graphical device configuration interface simplifies the system installation cycle.
4. Has many years of research and development and industry experience, independent core technology.
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.movingcommtech.com