WHAT IS A MODEM?
A modulator-demodulator, or simply modem, is a computer hardware device that converts data from a digital format into a format suitable for an analogue such as telephone or radio.
WORKING OF MODEM:
As we know that computers can’t understand our language. Computers understand the language of 0’s and 1’s i.e. digital form. The modem will modulate the signal into a sine wave. So, this modulated digital signal can easily run over the telephone lines. Then the signal will reach the IP hub. After this, the demodulation of the signal will take place in digital form. Then you will be connected to the internet. All these processes are performed by modem at extremely high speeds. The speed of the modem depends upon the number of available access lines and the technology of the modem.
Today’s modems are of very high speeds. But some people are still using the slow speed modems having a speed of nearly 56kbps. The features of the modem are discussed below: 1. The speed of the modem is measured in bps means bits per second. The data transfer speed can be increased by using the technique of data compression.
2. If we are using a modem having an auto answering facility. Then our modem will be able to attend calls even in our absence.
3. Modems work basically in two modes. One is voice mode and the other is data mode. In voice, the mode modem acts like a simple telephone. But in data mode modem acts as a Simple modem. These types of modems have a switch that helps change the mode i.e. from voice mode to data mode and from data mode to voice mode. For voice communication, a loudspeaker and a microphone are implemented in the modem.
4. Some modems can compress data. These modems compress data before sending it to improve the data transfer rates. But there must be a similar technology modem to decompress the data at the receiver end.
5. There are three types of modems. All the three types are discussed in detail below: a) External Modems b) Internal Modems c) PCMCIA Modem External Modems: A serial cable connection is needed to connect an external modem to a PC. These modems use their power supplies. These modems have their independent controls. Internal Modems: Internal modems are integrated on a chip. These are put up into the PCI slots of the computer. There is no need for any external power supply for internal modems. These modems use the power supply of the PC. Their installation on PC is quite very simple.
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The information is provided by Tecquisition for general informational and educational purposes only and is not a substitute for professional legal advice. If you have any feedback, comments, requests for technical support or other inquiries, please mail us by tecqusition@gmail.com.
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