Introduction to basic knowledge of ADSL Broadband Access Network

There are many things worth learning about the ADSL Broadband Access Network. Here we mainly introduce the comprehensive knowledge of the ADSL Broadband Access Network. Although many network access methods such as ddnleased line and ISDN have appeared in the past few years, they have not been successfully popularized due to various reasons such as cost and speed. Currently, you can consider three types of broadband access methods: China Telecom ADSL, FTTX + LAN (residential broadband), and cable modem ).

Access Method 1: China Telecom ADSL

To facilitate public understanding of ADSL (all called asypolicric Digital Subscriber Line, Asymmetric Digital user Line), local telecom bureaus often use some nice names to promote the ADSL Broadband Access Network, for example, "super one-line communication" and "network express" refer to the same broadband mode.

Installation conditions:

In terms of ease of installation, China Telecom ADSL is undoubtedly advantageous. The ADSL Broadband Access Network can directly use existing telephone lines to transmit digital information through the adsl modem. Therefore, all users who have installed a telephony have the basic conditions for installing ADSL (as long as the local telecommunications Bureau activates the ADSL Broadband Service). Then, the user can go to the local telecommunications Bureau to check whether the phone number can install ADSL, after receiving a positive response, you can apply for installation. (In general, China Telecom will determine whether the distance between your phone number and the nearest data center is more than 3 km. If the answer is exceeded, you cannot install it ). During installation, you must have an adsl modem (usually provided by China Telecom and purchased by yourself in some regions) and a computer with a nic.

Transmission rate:

Although the maximum theoretical uplink rate of the ADSL Broadband Access Network can reach 1 Mbps and the downlink rate can reach 8 Mbps, the actual rate provided by China Telecom for ordinary household users is mostly 512 Kbps downstream, few regions provide a speed of 1 Mbps or above. It is worth noting that the transmission rate here is the user's exclusive bandwidth, so you do not have to worry that using the ADSL Broadband Access Network at the same time may slow the network speed. In addition, China Telecom often uses "acceleration" of ADSL as the propaganda focus. Everyone must understand that the "acceleration" mentioned here usually refers to the downstream speed, while the upload speed remains unchanged.

Advantages:

Work is stable and the probability of failure is small. If a fault occurs, you can contact China Telecom (such as calling 1000) in a timely manner, and usually get technical support and troubleshooting quickly. China Telecom will launch subscription packages of different prices to provide more options for users. The bandwidth is exclusive and the Public IP address is used. You can create websites, FTP servers, or game servers.

Disadvantages:

The speed of the ADSL Broadband Access Network is slow. Taking the bandwidth of one hundred kbps as an example, the actual maximum download speed is about 87KB/s. Even if the bandwidth is upgraded to 1 Mbit/s, it can only reach KB. High requirements on the quality of telephone lines. If the quality of telephone lines is poor, ADSL may be unstable or disconnected.

Access Method 2: residential broadband (FTTX + LAN)

This is a widely used broadband access method in large and medium-sized cities. network service providers use optical fiber access to the building (FTTB) or residential area (FTTZ), and then access the user's home through a network cable, provides shared bandwidth (usually 10 Mb/s) for the entire building or residential area ). At present, many Chinese companies provide such broadband access methods, such as China Netcom, Great Wall broadband, China Unicom, and China Telecom.

Installation conditions:

This type of broadband access is usually requested and installed by the community, and the network service provider does not accept personal services. The user can ask the property manager of the residential area or directly ask whether the local network service provider has enabled broadband connection for the residential area. This access method has the lowest requirement on your device. You only need a computer with a 10/100 Mbps adaptive Nic.

Transmission rate:

At present, the majority of residential broadband is 10 Mbps shared bandwidth, which means that if there are more users accessing the Internet at the same time, the network speed is slow. Even so, in most cases, the average download speed is still much higher than that of the Telecom ADSL Broadband Access Network, reaching hundreds of KB/s, which has a great advantage in terms of speed.

Advantages:

The initial installation fee is low (usually between 100 and ~ The download speed varies by region. The download speed is usually 300 KB/s. It is suitable for users who need to download files frequently, and there is no limit on the upload speed.

Disadvantages:

As this type of broadband access is mainly for residential areas, individual users cannot apply for it on their own. They must submit an installation application to the network service provider after the number of residential users reaches a certain level, which is inconvenient. However, once the residential area has activated broadband, the waiting time from application to installation is very short. In addition, the network operator determines which company's broadband service is used in each residential area, and users cannot choose.