Do you use DSL or ISDN for the Internet caf ?

ISDN (Integrated Service Digital Network) Chinese name is integrated service digital network, which is the abbreviation of the telecommunications network of digital exchange and digital transmission, and China Telecom commonly calls it"One-stop service"。It provides end-to-end digital connectivity, can carry voice and non-voice services, and allows users to access the network through multi-purpose user --- network interfaces. ISDN uses digital transmission and digital switching technology to integrate multiple services such as **, fax, data, and image into a unified digital network for transmission and processing.

The basic rate interface consists of two independent B channels (64 kbits) and one D channel (16 kbits). Channel B is generally used to transmit voice, data and images, and channel D is used to transmit signaling or packet information.

XDSL is a general term for various types of DSL (Digital Subscriber Line), including ADSL, RADSL, VDSL, SDSL, IDSL, and HDSL. XDSL is a new transmission technology that uses higher frequencies and corresponding modulation techniques on existing copper** lines, that is, signal processing techniques that add or acquire more digital data to analog lines to obtain high transmission rates (theoretical values can reach 52Mbps). The biggest difference between various DSL technologies is reflected in the difference in signal transmission rate and distance, as well as the symmetry of the uplink channel and downlink channel.

Optical fiber access refers to the complete optical fiber transmission between the central office and the user**, and optical fiber access can be divided into active optical access and passive optical access. The main technology of optical fiber user network is light wave transmission technology. Optical fiber access is an ideal broadband access method, which can solve the problem of broadband Internet access well, with fast speed, low obstacle rate and strong anti-interference.

However, due to the limitation of egress bandwidth, if the number of users on the route increases sharply, the speed of network access will drop sharply, and partial disconnection is a common problem.

Internet cafes generally use fiber optic access, and families generally use ADSL, and ISDN has been eliminated.

ISDN (Digital Integrated Service Network) has long been outdated, and Internet cafes are all private line access! Access with fiber optics! And DSL is partially used by our home users. For example, ADSL

ISDN is an obsolete Internet access technology, which is a vertical transmission channel through the voice ** network concession, and the maximum bandwidth cannot exceed 128K

In addition to the use of Bi Mengyuan's 2 copper wires, DSL uses DSLM equipment and optical fiber to form a data network, and the DSL modem bandwidth has 2M

ISDN is a obsolete Internet access technology, which provides a transmission channel through a voice ** network, and the maximum bandwidth cannot exceed 128K

In addition to the use of the original 2 copper wires, DSL uses DSLM equipment and optical fiber to form a data network, and the DSL modem bandwidth has 2M

ISDN is an upgrade of PSTN, DSL is a digital subscriber line, and LAN is a local area network.

I told the judge that Qi Yan is not very clear, go to these two addresses to see! There should be what you need!

Speed: LAN DSL>ISDN (no longer used).

However, the LAN is a multi-person shared bandwidth, and there are more people who take it back, and the speed may not be as fast as Senyin's own pretending to sell an adsl.

This is two ways to connect the hood, one means to connect at a speed of 128kb, and the other is to connect at a speed of 256k, the difference is mainly in the speed of the eggplant, when the speed of the 256 is faster.

128kbps is fast, 256k bys is slow. It's as simple as that.

The Internet is not on.

Because the Z version is going to be on Steam

However, you can use QQ to fight the platform and Haofang to go to the LAN.

Ask your school network manager!