What does wireless broadband Internet access not include?

Internet access supported by China Telecom's wireless broadband does not include CDMA. Baidu knows.

What does wireless broadband Internet access not include?

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There are eight ways to access the Internet:

1, telephone line dial-up access

That is, using the access number provided by the local operator, dial-up access to the Internet through the telephone line, and the speed does not exceed 56Kbps. Its characteristic is easy to use, and only an effective telephone line and a PC with a modem can access it.

2、ISDN

Commonly known as "one-line communication". It uses digital transmission and digital exchange technology to integrate telephone, fax, data, images and other services into a unified digital network for transmission and processing.

Users can use ISDN subscriber line to make phone calls and send and receive faxes when surfing the Internet, just like two telephone lines. ISDN basic rate interface has two information paths of 64kbps and a signaling path of 16kbps, which is called 2B+D for short. When a call comes in, it will automatically release a B channel to answer the call.

3.ADSL access

This is the most widely used copper wire access method. ADSL can directly use the existing telephone line and transmit digital information through ADSLMODEM. The theoretical rate can reach 8Mbps for downlink and 1Mbps for uplink, and the transmission distance can reach 4 ~ 5 kilometers. ADSL2+ rate can reach 24Mbps downstream and 1Mbps upstream.

4、HFC

A method for accessing copper wire resources based on CATV network. It has the connection characteristics of private line internet access, allowing users to realize high-speed internet access through cable TV network.

Suitable for families, individuals or small and medium-sized groups with cable TV networks. Its characteristics are high speed, convenient access mode (data transmission through wired cable does not need wiring), and it can realize various video services, high-speed download and so on.

5, fiber broadband access

Access to cell nodes or corridors through optical fibers, and then connect to various * * * enjoyment points through network cables (generally not exceeding 100 meters), providing high-speed interconnection access in a certain area. It is characterized by high speed and strong anti-interference ability, which is suitable for families, individuals or various enterprises and institutions, and can realize various high-speed Internet applications (video service, high-speed data transmission, remote interaction, etc.). ).

6. Passive optical network

PON (Passive Optical Network) technology is a point-to-multipoint optical fiber transmission and access technology. The maximum distance between the local office and users is 20km, and the total transmission capacity of the access system is155mbps/622m/1Gbps, which is shared by all users, and the bandwidth used by each user can be divided in steps at 64kbps.

Its characteristic is high access rate, and it can realize various high-speed Internet applications (video service, high-speed data transmission, remote interaction, etc. ).

7. Wireless network

It is an extension technology of wired access, which uses radio frequency (RF) technology to send and receive data through the air, reducing the use of wired connection, so the wireless network system can not only achieve the purpose of building a computer network system, but also allow devices to arrange and move freely. In public places or enterprises, wireless networks are generally used as a supplementary way to existing wired networks, and computers equipped with wireless network cards can easily access the Internet through wireless means.

8. Power grid access

Power line communication technology refers to a communication method that uses power line to transmit data and media signals, also known as power line carrier.

Load the information carried by high frequency into the current, and then transmit it to the adapter that receives the information through the wire, and then separate the high frequency from the current and transmit it to the computer or telephone.

PLC belongs to electric power communication network, including PLC laid by cables, pipes and poles and optical fiber communication network. The internal applications of power communication network include power grid monitoring and dispatching, remote meter reading and so on. Family-oriented PLC, commonly known as power broadband, belongs to low-voltage distribution network communication.