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This article mainly introduces the common network access methods, the article is very detailed, has a certain reference value, interested friends must read it!

Five common network access methods are: 1, dial-up Internet access; 2, ISDN Internet access; 3, broadband Internet access; 4, optical fiber broadband Internet access; 5, wireless Internet access.

The operating environment of this tutorial: windows10 system, Dell G3 computer.

1. Dial-up Internet access

Dial-up access is the most common way for people to connect to the Internet when there was the Internet, and this is the most widely used way of Internet access in the past. It connects the computer to the Internet through a modem and phone line, and then further accesses network resources. The advantages of dial-up Internet are: it can be easily installed and configured, and the one-time input cost is low. Users only need to get an account on ISP (network operator) to access the Internet, and then connect the necessary hardware settings to access the Internet. But the speed of using dial-up Internet access is slow and the quality of access is poor, and if you are on the Internet, you cannot receive phone calls at the same time. If the time on the Internet is not long, it is more suitable to use this way of surfing the Internet.

2. ISDN Internet access

ISDN, the abbreviation of Integrated Service Digital Network, is an international standard of digital telephone network, that is, narrowband integrated services digital network, commonly known as "one-line communication". It also uses existing telephone lines to access Intemet. ISDN is generally used in network environments where uploads are more frequent. The advantages and disadvantages of this way of accessing internet are

Advantages:

Integrated same letter service: telephone, fax, visual text, videophone and other services can be realized with one user line.

The quality of transmission is high: due to the use of end-to-end digital connection, the terminal to the terminal is completely digitized, and the quality of transmission is obviously improved.

Flexible and convenient to use: with only one access interface and a unified number, you can get all kinds of services you need from the network, and you can connect different kinds of terminals.

Disadvantages:

The speed is not fast enough compared with the access methods such as ADSL and LAN.

The cost of being online for a long time will be high.

The equipment is not cheap.

3. Broadband Internet access

Broadband Internet access ADSL (Asymmetric DigitalSubscriber Line), that is, asymmetric digital subscriber line. ADSL technology uses frequency division technology to separate the low-frequency signal from the high-frequency signal transmitted by the ordinary telephone line. It is a technology of high-speed data transmission on the ordinary telephone line. It uses the frequency that has never been used in the telephone line, so it can break through the limit of the 56kbPS speed of the modem.

ADSL technology has the following characteristics:

(1) the transmission rate can be up to 640Kpbs in the uplink and 8Mbps in the downlink, which is much higher than that of dial-up Internet access.

(2) charge only the network usage fee, but not the low rate of the Internet local telephone fee.

(3) it can coexist with ordinary telephone on one telephone line, and ADSL transmission can be carried out while receiving and dialing calls on an ordinary telephone line without affecting each other.

The disadvantage of ADSL broadband Internet access is that it can not transmit analog signals.

We can use the following table to compare the three kinds of links introduced above.

4. Optical fiber broadband Internet access

Optical fiber broadband is to convert the data to be transmitted from electrical signals to optical signals for communication. "light cats" are installed at both ends of the optical fiber for signal conversion. This way of connecting to Internet can make the download speed up to 6Mbps and the upload speed up to 640kbpS. Optical fiber is one of the most ideal transmission media in broadband network, which is characterized by large transmission capacity, good transmission quality, low loss, long relay distance and so on. The advantages of optical fiber Internet are exclusive bandwidth, stable performance, low upgrade cost, no electromagnetic interference, low loss, strong security and confidentiality, and long transmission distance. The difference between optical fiber broadband and ADSL access mode is: ADSL is electrical signal propagation, optical fiber broadband is optical signal propagation.

5. Wireless Internet access

Wireless Internet access refers to the use of wireless access to the Internet, which uses radio waves as the medium of data transmission. In other words, it does not need to be connected to the Intemet through the telephone line or the network line, but through the communication signal. As long as the location of the user is within the radio coverage of the wireless access port, it is easy to surf the Internet with a compatible wireless network card. Nowadays, wireless Internet has been widely used in business districts, universities, airports, and other public areas, and its network signal coverage area is further expanding.

The advantages of wireless Internet are:

Free from the restrictions of place and time

The speed of software articles is fast

You can also send and receive text messages using a wireless network card.

One of the disadvantages of wireless Internet is that the cost is relatively high.

The above is all the contents of the article "what are the common network access methods?" Thank you for your reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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