What is the difference between modem and router

Difference: Router is a network layer device, and modem is a physical layer device. The router performs routing and forwarding, followed by NAT, QOS and other functions, and is the core of the Internet; the modem converts the signal into a coding format suitable for transmission on the transmission link to facilitate long-distance transmission.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Router (Router, also known as router) is a computer network device that can transmit data packets to the destination through each network (selecting the transmission path of the data). This process is called routing. A router is a device that connects two or more separate networks. Routing works on the third layer of the OSI model - the network layer, such as the Internet Protocol (IP) layer.

Modem (MODEM) is a communication device developed to transmit digital signals using analog channels. Computers can only process digital signals, and some existing channels can only transmit analog signals. In order to use analog channels to transmit digital signals, the sending end must convert the digital signals into analog signals and modulate the digital signals to be sent onto the carrier wave. , while the carrier signal is an analog signal and can be transmitted on an analog channel. Then, the receiving end performs corresponding processing to restore the transmitted digital signal. This process is demodulation. In this way, the purpose of transmitting digital signals on the analog channel is achieved, as shown in Figure 1. In practical applications, duplex communication is generally used, so the modulator (MOdulator) and the demodulator (DEModulator) are assembled together to form our commonly used modem (MODEM).

The difference between modem and router

The modem is a modem, which is used to access the Internet through telephone lines (including ADSL broadband and ordinary telephone lines to access the Internet), while the router uses To set up a local area network (including wireless and wired), it can also be used with modem to allow multiple computers to access the Internet at the same time with one phone line. Direct connection to the cat is faster. The speed attenuation of most wired connections after connecting to the router is very small and can be ignored, and the wireless speed is not as fast as the wired one.

Internet modem is also called a modem, which converts and forwards signals. Connect one end of the network cable from China Telecom or China Netcom and the other end to the computer network cable. Open "Broadband Connection" on your computer and fill in the account number and password given to you by the network provider to access the Internet.

To read more related articles, please visit PHP Chinese website! !

The above is the detailed content of What is the difference between modem and router. For more information, please follow other related articles on the PHP Chinese website!