What is the difference among optical modem, switch and router? When data is transmitted from one subnet to another, it is necessary to rely on routers to establish flexible connections, and connect various subnets with completely different data packets and cut-off access methods. The router can be connected to multiple logically separated networks (a single network or a subnet), has the function of judging network addresses and selecting IP paths, and is the "traffic police" of the Internet. It will automatically select and set routes according to the signal conditions, and use the best path to follow the front and back. It is generally applied to the network layer. Each port of the switch has a bridging function, which can be connected to a local area network or a high-performance server or work.Ī router (ie a gateway device) is an interconnection device that connects various LANs, WANs, and metropolitan area networks in the Internet. Wide area network switches are devices that complete information exchange functions in communication systems, and are generally used in the data link layer. Switches can be divided into wide area network switches and local area network switches according to different working positions. It can provide an exclusive electrical signal channel for any two network nodes connected to the switch. ![]() Therefore, if you want to connect your computer to the Internet through a telephone line, you must rely on The optical cat modulates and mediates two different signals.Ī switch (multi-port bridge, data storage and forwarding) is a network device used for electrical/optical signal forwarding. Telephone lines transmit analog signals, and PCs transmit digital signals. It has the function of modulation and mediation, and is the "translator" of analog and digital signals.Įlectronic signals are divided into "analog signals" and "digital signals". A modem is a device that converts a digital signal into an analog signal through modulation at the transmitting end, and converts the analog signal into a digital signal through demodulation at the receiving end.
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