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The modem is a device used in computing to convert digital signals to analogue and vice versa to be transmitted intelligibly.

Modem

In computers, the modem is an input/output peripheral that can be both internal and external. It allows you to connect a telephone line to the equipment and access different networks, such as the Internet.

How does a modem work?

It’s operation system when establishing communication is as follows: the first thing is to proceed to detect the line’s tone, then the corresponding number is dialed, and the link gets established in third and last place.

In the case of Internet connection by telephone, the modem receives analogue data, demodulates it, and converts it to digital. The device also performs the reverse process, allowing communications.

However, they are not the only alternatives. We also find that the connection can run through what is known as UART (Universal Asynchronous Receiver-Transmitter). It is located on the device’s motherboard and is responsible for carrying out the control of the different ports.

Internal modems are expansion cards connected through different types of connectors: AMR (a no longer commonly used). ISA Bus (not currently used due to the low speed it offers) and PCI Bus (the most common format).

An internal modem offers the advantage of receiving electrical power directly from the computer. On the other hand, it does not take up space and is usually cheaper than external ones.

External modems, precisely, stand out for the ease of installation and even for the possibility of transporting and using them on different computers. Another benefit of this hardware is that it has light indicators that allow us to know the status of the connection.

In the case of Internet connection by telephone, the modem receives analogue data, takes care of demodulating it, and converts it into digital. The device also performs the reverse process, allowing communications.

The internal modem offers the advantage of receiving electrical power directly from the computer. On the other hand, it does not take up space and is usually cheaper than outside.

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