. Contactless IC Card In addition to the card contains IC card circuit, also contains the relevant RF transceiver circuit and antenna coil. IC card can receive the signal of reader and writer in a certain distance, and realize non-contact reading and writing.RF Identification Card
Radio Frequency identification card (RF card, RFID card), also known as contactless IC card (contactless Smart card) or contactless IC card, contactless card, inductio
One, the current family for wireless router + notebook + desktop use, if the desktop and notebook and wireless router in a room, but the phenomenon is also very frequent drop line.
If you connect to a router's desktop, dial-up stability, long work does not drop the line, then you can judge the fault may come from the wireless router, we can improve the quality of the router's power, heat, and so on, if the problem has not been resolved, we have to speed limit, the average distribution of two co
In general, the process of CDMA network optimization is divided into three stages: single base station configuration confirmation, community optimization and system-wide optimization (or global optimization), each phase completes different tasks.
Single Base station configuration confirmation
The goal is to confirm the installation integrity of the BTS and the accuracy of the data. The verification parameters include:
(1) The Base station equipment debugging: the base station equipment debugg
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1. OSI Seven layer protocol model1.1 Why mobile device management is requiredAlong with the rapid development of 3G technology in China, the dat
I. Questions about enhancing wireless signals
As you know, wireless signal loss may occur due to transmission distance, media, or other factors, shortening the transmission distance and reducing the transmission speed. Therefore, to improve the wireless transmission performance and improve the wireless routing signal, you can start from the following aspects.
◆ High-gain antenna preferred
Both wired and wireless networks have signal attenuation. Compa
= Corrected_valueresampler.sample_freq_out=corrected_value0x05 GPS Active AntennaSecurity researchers use a low noise amplifier (Noise amplifier LNA) antenna with ceramic patch days as an active GPS antenna to reduce overall noise. Showing the Garmin ga27c GPS antenna, we can see a piece of ceramic patch on its PCB board:Garmin GA-27 active
interference
If the noise intensity of your network bandwidth exceeds the -85DBM, then RF interference is likely to impair network performance. In this case, the user's retry rate will exceed 10%, and the user will feel the network speed is affected. This can happen, for example, when a wireless user is in the same room as a running microwave oven. If you decide that the problem is caused by radio frequency interference, you have to find out where the interference comes from and try to remove
present, wireless routers in the indoor launch power generally does not exceed 20dBm. The higher the transmitting power of the wireless router, the higher the signal strength, but more than the specified range will cause large electromagnetic radiation and interference.
Antenna gain: The greater the gain, the stronger the signal strength, at present, most of our routers antenna gain 3dBi.
Working Band: T
router until you hear a "click" of a network card. Now that the "one wireless router" and "one broadband network cable" have been successfully connected, the process of installing the wireless router has already been completed, and then let us know about the wireless router.
In addition to what we have just mentioned, wireless router, a number of network cable interface, a wireless router also has a power interface, as a network equipment, wireless routers need independent power supply, that i
When the router is published, there are some technical terms, such as 802.11AC, 5G, gigabit, dual frequency, 2*2 antenna, Wi-Fi, and also the conclusion that "10 times times Faster", "Top Configuration", "Global X". Under the manufacturer propaganda, some people think that the product is good to be bad, also some people think the manufacturer is bragging x. This article is the wireless router knowledge popularization, each followed by a selection of s
wireless route, it will also seriously affect the transmission of wireless signals.
6. Adjust the antenna Angle
During use, the antenna angle is also worth our attention. Through the adjustment of the antenna angle, we can think of the enhancement of the coverage intensity of wireless networks in some areas, enhances the stability and transmission rate of the sp
points is in line with the communication distance of bridge equipment.
Can use the point to point Way direct transmission: a building to place a wireless network bridge, the top placement side directional antenna; B building also placed a bridge without a network, the top of a directional antenna. Wireless network bridge between the two places through the feeder and the local
requirements. The ISO15693 standard complies with the library industry standards. Advantages: good security and anti-counterfeiting performance; can be used on books, CDs, and tapes; fast read/write speed without interference; can be read at the same time; applicable: various media books, tapes, and CDs); 2. intelligent Security Detection System 1) function description checks whether any missing books are taken out, and provides sound and lighting alarm functions. Technical SpecificationsMechan
erection cost is not as high as that of wired LAN, the successfully deployed wireless LAN can be easily changed in the future. More importantly, the expansion of the wireless LAN network is very good. For example, it can be compatible with various network connection interface standards, supports and complies with all communication protocol standards. For common access users, it is almost a completely transparent link that can meet the access needs of various client systems. With the help of Wir
Wireless LAN technology is becoming more and more mature, but many people are not clear about the wireless LAN networking method. Here we will summarize some specific methods for you to learn.
Wireless Networking 1 wireless networking
Networking requirements: Establish a network without a line in the LAN to share resources among devices.
Networking Mode: place a wireless access point in the LAN center and add a wireless network card to the Internet device.
2-point-to-point wireless networking
①
There are many networking methods for wireless networks. which method is suitable for our work environment? Here we will give a detailed description of the networking requirements.
Many of us are not clear about the typical networking methods of Wireless LAN, But what operations should we do? The following describes several typical methods. I believe this article will be helpful to you.
Wireless Networking 1 wireless networking
Networking requirements: Establish a network without a line in the L
1. Wireless Networking
Networking requirements: Establish a network without a line in the LAN to share resources among devices.
Networking Mode: place a wireless access point in the LAN center and add a wireless network card to the Internet device.
2. Point-to-point connection
① Wireless connection between a single machine and a computer network
Networking requirements: achieve wireless connection between remote computers and computer network centers
Networking Mode: Add a wireless access point
occur, reducing its transmission range. Therefore, do not hide a wireless router in the corner of the room, or bury it in the basement or in the shelve, instead, try to place the wireless router in the center of your wireless activity.
For the duplex room, try to place the wireless router in the center of the room
So how can we identify such a central location?
In fact, the simplest way is to observe through your line of sight, that is, where you can see the most room scenarios, then this
Wireless LAN technology has become the focus of all people, so what are the different requirements and instructions for wireless network networking methods? There is a networking method suitable for you through the following introduction.
Wireless Networking 1 wireless networking
Networking requirements: Establish a network without a line in the LAN to share resources among devices.
Networking Mode: place a wireless access point in the LAN center and add a wireless network card to the Internet d
Broadband Wireless Access in China is developing very rapidly. Many people may not be familiar with the development status and future development direction of broadband wireless access. After reading this article, you must have gained a lot, I hope this article will teach you more things. The possible major impact on the future of wireless cities is the rise and development of the family base station Femtocell. Femto refers to the second to second (10-12 seconds), and Femtocell refers to the ult
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