Wireless network card: Wireless network card is a widely used Internet medium in wireless wide area communication network. At present, China has four network standards: wcdma, edge, td-scdma and cdma (1X), so the common wireless network cards are wcdma wireless network cards, CDMA wireless network cards, EDGE and td-scdma wireless network cards.
Wireless network cards and wireless network cards seem to be the most confusing wireless network products for users, and comparing prices may be the easiest way to distinguish them. Most wireless network cards have dropped to 200 yuan or even 100 yuan, while wireless network cards are often around 1,000 yuan. In fact, they are two completely different network products: a wireless network card refers to a local area network card with wireless connection function, which, like an ordinary computer network card, is used to connect the local area network. It is only a signal receiving and sending device. Only by finding the exit to the Internet can we realize the connection with the Internet. All wireless network cards can only be limited to the existing wireless LAN, and their access to the Internet depends on the proxy server or wireless router connected to the WAN.
The function and function of wireless network card is equivalent to cable modem. It can use the SIM card of a mobile phone to connect to the Internet anywhere with wireless phone signal coverage. In China, its supporting networks are GPRS launched by China Mobile and CDMA 1X launched by China Unicom WCDMA and China Telecom.
[Edit this paragraph] function
It is equivalent to a cable modem, and you can use the SIM card of your mobile phone to connect to the Internet wherever there is wireless telephone signal coverage. In China, its supported networks are GPRS launched by China Mobile and CDMA 1X launched by China Unicom.
In fact, China Unicom's current wireless network includes CDMA, and its mobile network includes EDGE and GPRS. The theoretical maximum data transmission rate of EDGE can reach 460.8 kbps, and the theoretical maximum data transmission rate of CDMA can reach 230.4kbps. The speed relationship between them can be intuitively described as: Mobile EDGE=2 times Unicom CDMA=2 times mobile GPRS. So at present, the Internet access speed of EDGE is the fastest. However, EDGE is only available in most cities at present. If you want to choose an EDGE network, I suggest you first determine whether your city has EDGE. If there is no area where EDGE is available, I suggest you buy Unicom CDMA tariff card.
[Edit this paragraph] Classification
Various network cards
GPRS (General Packet Radio Service): 56 even 1 14Kbps.
Edge (Enhanced Data Rate for GSM Evolution): The highest rate can reach 384kbps, generally about 200 kbit/s..
Td-scdma (time division-synchronous code division multiple access code division multiple access technology): 384kbps.
HSDPA: High-speed downlink packet access technology.
TD-SCDMA HSDPA: at present, the maximum is 2.8Mbps, the latest market products reach 3.6m, and the laboratory products reach 33M.
CDMA2000 1X EV-DO (which can be understood as HSDPA of CDMA2000): the peak rate in Korea and Japan reaches 2.4Mbps.
HSDPA of WCDMA: Theoretically, it can reach 14.4Mbps, and it can basically reach 3.6Mbps in China, Hongkong, China, Taiwan Province, South Korea, Europe, the United States and other countries or regions, and it can reach 7.2Mbps in a few areas.
What are the manufacturers of wireless network cards?
At present, the wireless network card is mainly OEM, while China Unicom and China Mobile adopt centralized procurement mode, and the power of telecom procurement is relatively scattered. Formally, they are basically short-listed brands, and the market is dominated by Huawei and ZTE, and the price is relatively high. The manufacturers of China Mobile mainly include Datang, Huawei, ZTE, Times Power, Netcom, Lenovo, Huayu and P-Link.
The manufacturers of China Unicom mainly include Huawei, ZTE, Lenovo, Dexin, P-Link and Star Network.
The manufacturers of China Telecom mainly include Huawei, ZTE, P-Link, Shouxin, Putian, Dexin and Shichuangxing.
Almost all the existing 3G network card devices are dual-mode automatic switching. Where there is no 3G signal, you can choose other networks, and the network speed is relatively slow. China telecom can switch freely between EVDO and CDMA 1X network, China mobile can switch freely between TD-SCDMA network and EDGE network, and China Unicom can switch freely between WCDMA and CDMA 1X network.
What interfaces does the wireless network card have?
At present, wireless network cards are mainly used in notebooks and PDAs, and some are used in desktops, so their interfaces also have various specifications. Common interfaces mainly include PCMCIA interface, USB interface, EXPRESS34 interface, EXPRESS54 interface, CF interface and so on.
PCMCIA interface
Wireless network cards with this type of interface are usually dedicated to mobile devices such as notebooks. Due to the space limitation of notebook computer, it is far less than PCI interface network card. PCMCIA bus is divided into two categories, one is 16-bit PCMCIA and the other is 32-bit CardBus.
CardBus is a new type of high-performance PC card bus interface standard for notebook computers, just like PCI bus widely used in desktop computers. Compared with the original PC card standard, this bus standard has the following advantages: first, 32-bit data transmission and 33MHz operation. The maximum throughput of CardBus fast Ethernet PC card is close to 90 Mbps, while 16-bit fast Ethernet PC card can only reach 20-30 Mbps. Second, bus autonomy. The PC card can directly exchange data with the computer memory independently of the main CPU, so that the CPU can handle other tasks. Third, 3.3V power supply, low power consumption. It prolongs the battery life, reduces the heat diffusion inside the computer, and enhances the reliability of the system. Fourth, backward compatibility with 16-bit PC cards. The PC card of the old Ethernet and modem equipment can still be inserted into the CardBus slot for use.
Usb interface
USB (Universal Serial Bus) has much higher transmission rate than the traditional parallel port and serial port, and it is easy to install and supports hot plug. Once the USB device is connected, it can be immediately recognized by the computer, loaded with any required drivers, and can be put into use immediately without restarting the system. When a device is no longer needed, you can unplug it at any time and plug another new device into the port. Then, this new equipment can also be confirmed immediately and start working immediately, so it is increasingly welcomed by manufacturers and users.
CF interface
CF(Compact Flash) wireless network card is mainly used for PDA and other devices. CF card is made according to ATA standard, but its interface is 50 pins instead of 68 pins, which are divided into two rows with 25 pins in each row. CF cards are divided into type I and type II, and their specifications and characteristics are basically the same. The only difference between the two models is the thickness of the card. CF card is not a pin interface like hard disk, but a 50-pin (1.27 mm) hole interface, which is not easy to be damaged. This design is similar to PCMCIA interface.
SD interface or Express card interface
As for SD interface or Express card interface products, we suggest that you don't have to consider them for the time being. The wireless network card with SD interface requires the device to have SDIO interface, which is supported by only a few PDA's and is expensive. As for the Express card interface, although its long-term trend of replacing PCMCIA interface is beyond doubt, at least for now, it is still too advanced.
3G wireless network card
CDMA2000 1XEV-DO evolved from cdma2000. Compared with wired broadband, it is the third generation (3G) mobile communication standard, which can provide high-speed wireless connection.
CDMA2000 EVDO allows individual users to send and receive emails with large attachments, enjoy real-time interactive games, send and receive high-resolution pictures and videos, download videos and music content, or keep wireless connection with computers in the office.
This product is an Internet access device for CDMA2000 EVDO network wireless high-speed data service. You can insert the UIM card with EV-DO service into the equipment and connect it with the USB interface of the computer, so as to realize the functions of high-speed wireless Internet access, voice call, short message sending and receiving, data transmission and so on. The maximum data download rate can reach 2.4Mbps, and the upload rate can reach 153.6Kbps, which is suitable for notebook computers, desktop computers and industrial computers. Compatible with CDMA2000 1X network, and the data transmission rate of EV-DO network is 153.6Kbps.
CDMA wireless network card CDMA wireless network card CDMA is the abbreviation of code division multiple access technology, which is an advanced wireless spread spectrum communication technology in the process of digital mobile communication in recent years. CDMA wireless network card is similar to GPRS wireless network card, which adopts PC card interface and can be plugged into notebook computer to realize wireless Internet access. Generally speaking, the fastest speed can reach 153K, which is almost four times the speed of GPRS. Although CDMA 1X is several times faster than GPRS, at present, the domestic CDMA 1X network is not very mature and often cannot reach this speed.
GPRS (General Packet Radio Service): 56 even 1 14Kbps.
Edge (Enhanced Data Rate for GSM Evolution): The highest rate can reach 384kbps, generally about 200 kbit/s..
Td-scdma (time division-synchronous code division multiple access code division multiple access technology): 384kbps.
HSDPA: High-speed downlink packet access technology.
TD-SCDMA HSDPA: at present, the maximum is 2.8Mbps, the latest market products reach 3.6m, and the laboratory products reach 33M.
CDMA2000 1X EV-DO (which can be understood as HSDPA of cdma2000): the peak rate in Korea and Japan reaches 2.4Mbps.
HSDPA of WCDMA: Theoretically, it can reach 14.4Mbps, and it can basically reach 3.6Mbps in China, Hongkong, China, Taiwan Province, South Korea, Europe, the United States and other countries or regions, and it can reach 7.2Mbps in a few areas.
[Edit this paragraph] Settings
Insert the plug-and-play wireless network card into the notebook computer, and windows xp can identify and install the driver. Next, configure ap, which is divided into gateway and gateway-free. An ap without gateway is equivalent to a hub. Here, the author focuses on the configuration of gateway-free ap.
Take netgear me 102 ap as an example, connect the ap with the usb interface on the laptop with the usb cable that comes with the ap, and install the setup software that comes with it.
Find "netgear me 102ap access point USB management" in Start and click. In the ap setting interface, click "Configure" to enter the configuration window.
2. In the "General" item, you can fill in the name of the access point and the essid with names that are easy to remember at will. The channel can also be selected at will, but the wireless network card in the notebook computer should be unified with it.
3. Set the Rate to Automatic.
4. In the "ip Settings" item, if dhcp (Dynamic ip Address Assignment) is used, just select "dhcp enable" and set "dhcp primary prot" to ethernet.
5. In the "encryption" item, laptops used at home generally use disable, which means that the standard encryption algorithm wap is disabled. The following two items need not be considered.
At this point, the ap setting is complete.
Open the Internet Neighborhood attribute to the wireless network connection status, click the wireless network connection attribute in the attribute, click the wireless network configuration, click Add under the preferred network, and set the service name ssid to be consistent with the ESID of the ap. Then, set the ip obtained automatically when using dhcp. All the settings have been completed.
[Edit this paragraph] Purchase
Attention elements
In fact, now the wireless network of telecom is CDMA, and the mobile ones are EDGE and GPRS. The theoretical maximum data transmission rate of EDGE can reach 460.8 kbps, and the theoretical maximum data transmission rate of CDMA can reach 230.4kbps. The speed relationship between them can be intuitively described as: mobile EDGE=2 times telecom CDMA, and telecom CDMA=2 times mobile GPRS. So at present, the Internet access speed of EDGE is the fastest. However, EDGE is currently only available in most cities. If you want to choose an EDGE network, I suggest you first determine whether your city has EDGE. If there is no area where EDGE is available, I suggest you buy a telecom CDMA tariff card.
First, the choice of interface: PCMCIA is the most suitable.
Like many other peripherals, choosing a wireless network card requires more consideration in interface selection. At present, wireless network cards mainly use PCMCIA, CF and USB interfaces, and a few products also use SD interface or Express card interface. PCMCIA is supported by almost all notebook computers, and the interface bandwidth is based on PCI bus, so the speed performance is naturally the best. However, in all fairness, a wireless network card that does not require high bandwidth does not require high interface bandwidth. Therefore, the advantage of PCMCIA is that the wireless network card can be completely inserted into the notebook slot in actual use, and there is basically no prominent part, which is undoubtedly safer and will not collide because of some unexpected situations. CF interface is smaller than PCMCIA interface, and can be converted into PCMCIA interface through an adapter of several tens of yuan, so it is also called the best interface of wireless network card. Of course, the CF interface is not chosen to cooperate with notebook computers, but to bring convenience to devices such as PDA and UMPC. Nowadays, many PDA's have CF interface, which supports data transmission. At this time, combining with the wireless network card, we can realize a very good outdoor mobile Internet application.
Relatively speaking, USB interface is not an ideal choice. Take the notebook computer application as an example, the USB interface device cannot be completely plugged in. At this time, the wireless network card will be easily damaged once it is accidentally bumped. In addition, general PCMCIA and CF interface products are always designed for low power consumption, while USB interface products seem to be more inclined to desktop applications, so power consumption control is often worse. Of course, it is not without advantages to choose a wireless network card with USB interface, which is flexible and compatible with desktop and notebook computers. This is the biggest attraction. As for SD interface or Express card interface products, we suggest that you don't have to consider them for the time being. The wireless network card with SD interface requires the device to have SDIO interface, which is supported by only a few PDA's and is expensive. As for the Express card interface, although its long-term trend of replacing PCMCIA interface is beyond doubt, at least for now, it is still too advanced.
Second, antenna selection: telescopic is the best.
Antenna is a detail that people easily ignore when buying wireless network cards, but it is related to the reliability and stability in practical use. The wireless network card antennas on the market can be divided into telescopic, detachable and fixed. There is no doubt that the former is the most convenient to use, and it can be put away when not in use, which not only does not affect the appearance, but also will not be damaged. Removable antenna is the best scheme to avoid collision damage, and spare antenna can be easily bought in case of damage. But the biggest inconvenience of detachable antenna is that it is difficult to keep and easy to lose. Of course, some wireless network cards can surf the Internet normally without using an antenna under the condition of good signal, which is more flexible. As for the fixed antenna, we must see whether it is a soft antenna or a hard antenna. Soft antennas are generally easy to bend and not easy to be damaged. If it is a hard antenna, you should be careful.
Third, pay attention to transmission stability and heat dissipation performance.
For wireless network card, the key to determine its transmission rate and stability lies in the transmitting chip. At present, the global launch module is monopolized by several major manufacturers, so the gap between different products is actually not big. Just like the strength of mobile phone signal, different wireless network cards have slightly different data transmission and reception capabilities under weak signals, which is related to the manufacturers' fear of rashly increasing the transmission power. Generally speaking, the manufacturer will not disclose the transmission power of the wireless network card, so everyone can only choose according to the actual trial of the product. What is certain, however, is that the transmission power is basically the same among the regular brand products popular in the market. After all, manufacturers also need to follow the relevant standards of relevant departments. However, once you buy some parallel imports or work package products, you have to be careful. After all, the domestic signal is not as good as that of foreign countries, and paying too much attention to health protection with low transmission power will also bring some troubles to outdoor internet access. Stability is another key point that we need to pay attention to. The stability factors caused by drivers and application software basically do not exist, because the core contents of related drivers are uniformly provided by the transmitter chip manufacturers, and software development will not pose technical difficulties and bottlenecks. Relatively speaking, calorific value is the focus we should pay attention to. In the narrow PCMCIA slot, if the wireless network card is used continuously for a long time, its calorific value must be small enough, otherwise it will easily lead to accelerated aging of the product and even frequent disconnection of the network.
Global network status of tariff package: CDMA2000 (EVDO) system is adopted for wireless Internet access, which is an American standard. At present, it is mainly used in the United States, Canada, Japan, South Korea, India and some countries in Central Asia, with 95 million users, accounting for 23% of the total Internet users.
China Telecom:
EVDO minute card
EVDO 60 hour card for half a year
EVDO country 2400 hours 1 year card
Tianyi Wireless Broadband 100 Package
Tianyi Wireless Broadband 200 Package
E-prepaid serial wireless Internet access at any time.
Lingyitong wireless internet access
China Unicom:
WCDMA 150 yuan Package
WCDMA 200 yuan Package
WCDMA 300 yuan Package
China Mobile:
TD 100 yuan package
TD 200 yuan Package
Wireless network card price:
The following are the prices of several commonly used wireless network cards:
Huawei EC 1260 380 yuan
President Chen CXC-E66 10 150 yuan
Huawei EC 126 1 400 yuan
ZTE MU350 430 yuan
China Unicom World Wind SJF6088 200 yuan
Yi Bei Digital V8 18G 180 yuan
Lenovo CE200 360 yuan
Sony Ericsson GC85 220 yuan
I believe you have enough choices @ @!