Three guidelines for purchasing Wireless Network Interfaces

After learning about the basic knowledge of wireless NICs, let's talk about the precautions for purchasing wireless NICs and the use of wireless devices such as wireless NICs and wireless NICs. First, we will focus on the three elements of wireless network card purchase.

Option 1: PCMCIA is the most suitable

Like many other peripherals, you also need to consider the interface selection when purchasing a wireless network card. Currently, wireless network interfaces mainly use PCMCIA, CF, and USB interfaces. In addition, a few products use SD interfaces or Express card interfaces. PCMCIA is supported by almost all laptops, and its interface bandwidth is based on the PCI bus, and the speed performance is naturally the best. However, in all fairness, low-bandwidth wireless network interfaces do not require high interface bandwidth. Therefore, the advantage of PCMCIA is that in actual use, the wireless network interfaces can be completely inserted into the inside of the laptop slot, there is basically no prominent part, which is undoubtedly more secure and will not cause a collision due to some unexpected circumstances.

The CF interface is more compact than the PCMCIA Interface, and can be converted to the PCMCIA Interface through a tens of Yuan Adapter. Therefore, it is also known as the best interface for wireless network interfaces. Of course, choosing the CF interface is not to work with a laptop, but to bring convenience to devices such as PDA and UMPC. Nowadays, many PDAs have CF interfaces and support data transmission. In this case, a good Outdoor Mobile Internet application can be achieved by combining wireless network interfaces.

Relatively speaking, the USB interface is not an ideal choice. Taking the laptop application as an example, the USB interface device cannot be completely inserted. In this case, the wireless network adapter is easily broken once an accident occurs. In addition, PCMCIA and CF interfaces are generally designed for low power consumption, while USB interfaces tend to be more inclined to desktop applications. Therefore, power consumption control is usually worse. Of course, selecting a USB interface wireless network card is not no good, flexible compatibility with desktop and laptop, this is the greatest temptation. We recommend that you do not consider the SD interface or Express card interface products for the time being. SD-interface wireless NICs require devices to have SDIO interfaces, which are only supported by a few PDAs and are expensive. As for the Express card interface, although it does not doubt the long-term trend of replacing the PCMCIA Interface, at least it is too advanced.

Option 2 for wireless network adapter: scalable

Antennas are the details that are easy to ignore when purchasing wireless network adapters, but they are related to reliability and stability in actual use. Wireless Network Card antennas on the market are divided into retractable, detachable, and fixed. There is no doubt that the former is the most convenient to use and can be taken away when not in use, not only does not affect the appearance, but also does not break in the face of bumps. The detachable type is the best solution to avoid bumps and damages, and the alternative antenna can be easily purchased if it is broken.

However, the biggest inconvenience caused by detachable antennas is that they are hard to store and are easy to lose. Of course, some wireless network adapters can access the Internet even if they do not use an antenna, which is more flexible. As for the fixed antenna, you must check whether it is a soft antenna or a hard antenna. Soft antennas are generally easy to bend and not easily damaged. If it is a hard antenna, you have to be careful.

Wireless Network Card Purchase element 3 focus on transmission stability and heat dissipation performance

For wireless network interfaces, the key to determining the transmission rate and stability is to transmit the chip. At present, the global launch module is monopolized by several major manufacturers, so the gap between different products is actually not big. Similar to the signal strength of a mobile phone, the data sending and receiving capabilities of different wireless network adapters in the weak signal are slightly different, which is related to the vendor's reluctance to increase the transmission power. Generally, the vendor does not disclose the transmit power of the wireless network adapter, so you can only choose based on the actual trial use of the product. However, it is certain that the launch power is basically the same among the popular formal brand products on the market. After all, manufacturers also need to follow the relevant standards of relevant departments.

However, once you purchase some water products or contractor products, you have to be careful. After all, the domestic signal is not as good as that in foreign countries, over-paying attention to low-transmit-power health protection will also cause some trouble for outdoor Internet access. Stability is another focus of attention. The stability factors caused by the driver and application software do not exist, because the core content of the driver is provided by the launch chip manufacturer, and the software development does not increase the technical difficulty and bottleneck. Relatively speaking, calorific value is our focus. In a small PCMCIA slot, if the wireless network adapter is used for a long time, the calorific value must be small enough; otherwise, the product may be accelerated and aged frequently.

Use

A wireless network card cannot connect to a wireless network, and a Wireless AP is required, which is equivalent to a hub of a wired network. The wireless network can be connected only when appropriate settings are made in the area covered by the Wireless AP.
Wireless Internet access relies on wireless network cards. Of course, wireless cat routing is required ).
A wireless Nic is equivalent to a receiver, and a wireless cat is routed wirelessly. In fact, it is still necessary to connect a wired Internet line to a wireless cat, and then transmit the signal into a wireless signal, which is received by the wireless Nic. Generally, a wireless route can be dragged down to 2 ~ With four wireless NICs, the working distance is less than 50 meters, and the communication quality is poor. Strictly speaking, this wireless solution only involves wireless network deployment, and the working environment must be closely connected to the wired network.

The price of a set is between 120 and ~ 200. The other is pure Wireless, which requires communication equipment, such as satellite receivers or mobile phones that can access the Internet. These things are connected to computers through dedicated data lines, they receive signals from satellite or wireless network services, but the speed is not very good, the communication cost is too high. In addition, satellite receivers and mobile phones are expensive, usually between 650 and ~ 2000. The advantage is that you can access the Internet even if you are in the desert mountain or wild Ridge ). These two solutions can be used on Laptops and Desktops. Of course, it is inconvenient to move the desktop, and wireless is meaningless.