Four mainstream broadband access methods

There are many ways to access the Internet through broadband, such as ADSL, residential broadband, and cable TV. How can we choose a suitable and economical way to access the Internet. In this chapter, we will introduce the advantages and disadvantages of these three methods to find out your favorite method.

Currently, there are four main methods for broadband Internet access: ADSL, residential broadband, wired connection, and electric power Internet access. This section describes their related concepts, information, and speed.

I. ADSL

1. Definition of ADSL

ADSL, an Asymmetric Digital loop, is a type of broadband access technology. It uses existing telephone user lines and uses advanced multiplexing and modulation technologies, this allows high-speed digital information and telephone voice information to be transmitted at the same time in different frequency bands of a telephone line, providing users with broadband access while maintaining their original telephone services and quality. According to the technical features of the ADSL Broadband Service and the user's telephone service, the two are separated in terms of service processing.

To facilitate public understanding of ADSL, communication bureaus in various regions often use some nice names, such as "super one-line communication" and "network express". In fact, these refer to the same broadband method.

2. Installation conditions

ADSL can directly use existing telephone lines to transmit digital information through ADSL Modem. Therefore, all users who have installed a telephony have the basic conditions for installing ADSL. Then, the user can go to the local telecommunications Bureau to check whether the phone number can install ADSL, after you get a positive answer, you can apply for installation. Generally, China Telecom will determine whether the distance between your phone number and the nearest data center is more than 3 kilometers. If the phone number exceeds the limit, it cannot be installed, because ADSL will weaken as it grows ). During installation, you need to bring your own 10/100 Mb adaptive Nic, while other devices such as ADSL Modem and Divider are usually provided by China Telecom. You can also buy them in some regions.

3. Transmission Rate

Although the maximum theoretical uplink rate of ADSL can reach 1 Mbps and the downlink rate can reach 8 Mbps, the actual rate currently 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 ADSL 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.

2. residential broadband FTTX + LAN)

1. residential broadband Definition

This is a widely used broadband access method in large and medium-sized cities. network service providers use optical fiber access to the building, and then access the user's home through a network cable. Residential broadband generally provides 10 Mbps bandwidth for residents, which is much higher than kbps of ADSL. However, residential broadband uses shared bandwidth, that is, all users share one exit, therefore, residential broadband will be slower than ADSL during peak hours. At present, many Chinese companies provide such broadband access methods, such as Great Wall broadband and gehua cable.

2. 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.

3. 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 China Telecom ADSL, reaching hundreds of Kbps, which has a great advantage in terms of speed.

3. wired Cable Modem)

1. Definition of Wired connection

In some cases, it is also called "Guang Dian Tong", which is totally different from the previous two methods. It directly utilizes the existing cable TV network and is slightly transformed, A channel of a closed-circuit cable can be used for data transmission without affecting the original transmission of cable TV signals. The theoretical transmission rate can reach 10 Mbps for uplink transmission and 40 Mbps for downlink transmission.

2. Installation conditions

Currently, there are not many domestic cities that have established wire connections, mainly in Beijing, Shanghai, Guangzhou and other major cities. Before installation, the user can ask whether the local wired network company can activate the wired network service. A Cable Modem and a computer with a 10/100 Mbps adaptive NIC are required for the device.

3. Transmission Rate

Although the theoretical transfer rate is very high, only 10 mbps bandwidth is usually activated in a residential area or building, which is also a shared bandwidth. When the number of Internet users is small, the download speed can reach 200 ~ 300 Kbps, similar to residential broadband.

Iv. Electric power Internet access　

1. Definitions of Electric Power Internet access

The so-called power network, that is, Power Line Communication is achieved by using wires. Its English name is PLC, and its English name is Power Line Communication. It uses the power line of Transmission Current as the communication carrier, so that PLC has great convenience. In addition, in addition to the use of electricity to access the Internet, the home phone, TV, audio, refrigerator and other household appliances in the house can also be connected by PLC for centralized control, to achieve the dream of "smart home. Currently, PLC is mainly used as a new access technology for residential areas, schools, hotels, office buildings and other fields.

2. Installation conditions

There are two types of devices that need to be added to access the Internet through PLC: local devices that require PLC and the PLC modem. The PLC modem is placed in the user's home, and the local equipment is usually placed in the building's distribution room. We only need to call the telephone number of the local power department or residential property to know whether the local residential area has activated the electricity Internet service.

3. Transmission Rate

Electric power can reach 4.5 ~ With a 45 Mbps high-speed network access, you can browse webpages, make phone calls, and watch online movies. This allows you to integrate data, voice, video, and power into one "! The speed is advantageous.

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