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Data transfer in Dial up Modems


The modem is the connection device between your computer and the telephone line through which you connect to internet. The word "modem" is a contraction of the words modulator and demodulator. A modem is used to send and receive data over a phone line. For an internet user, a modem is device that lets you connect your computer to a standard telephone line so you can get connected to internet. It is the key that unlocks the world of the Internet and its World Wide Web, commercial online services, electronic mail (E-mail), and bulletin board systems.

The phone lines transmit data in analog form and the data on internet transmits in digital form. Also, your computer can process data in digital form, in 0s and 1s. Hence, the main function of the modem is to make both sides comfortable by providing data in the form they could process or transmit. The sending modem modulates the data into a signal that is compatible with the phone line, and the receiving modem demodulates the signal back into digital data.

The modem has two ends one connects to the computer and other one to the telephone line. When you try to makes a connection, you can hear screeching sounds coming from the modem. These are basically, digital signals coming from the computer to modem. The modem modulates then into audible sounds to transmit over the phone line. Then the modem sends them over to telephone line. Modem sends a higher pitched tone to represent the digit 1 and a lower pitched tone to represent the digit 0.

At the other end of your modem connection, the computer attached to its modem reverses this process. The receiving modem demodulates the received tones into digital signals and sends them to the receiving computer.

This may sound very simple to most people. Actually, the process is a much more complex than sending and receiving signals in one direction and then another. Modems simultaneously send and receive signals in small packets. This is important to gain the speed in the transmission. For smooth working of a dial up connection the modem should gain and give data simultaneously.

Another part of the translation process involves transmission integrity. It is equally important to send and receive data properly so could be represented in a proper form in front of user. Hence, the modems also exchange an added mathematical code along the way. It allows both terminals to know if the data packets are transmitted in correct order. If the code does not match then the modems communicate with each other by resending the missing segments of data.

Modems also have special circuitry that allows them to compress digital signals before modulating them and then decompressing them after demodulating the signals. The compression/decompression processes manage the data in a way that it can travel along telephone lines more efficiently.

Hence, a modem is just more then a translator. Indeed, it is the most important device in the dial up connection.


More Useful Information on Free Dialup Connections, Internet, Broadband, Modems..

  1. ADSL (Asymmetric Digital Subscriber Line) FAQ's
  2. What is ADSL (Asymmetric Digital Subscriber Line)?
  3. Choosing Correct ISP.
  4. Data Transfer in Dialup Modem.
  5. Dialup Connection Modem Issues.
  6. Dialup Connection Speed and Throughput.
  7. Dialup Connection and your Telephone Line..
  8. Dialup Connection with V.92 Modem.
  9. Effect of Additional Phone Equipment on Dialup.
  10. Effect of Electromagnetic Interference on Dialup Connection.
  11. Evolution of Dialup Connection Speed.
  12. The Evolution of Dialup Modems.
  13. Features of Dialup Internet Access.
  14. What is ISDN (Integrated Services Digital Network)?
  15. Introduction to Dialup Connection.
  16. Minor Issues Causing Dialup Connection Failure.
  17. Main Features of a Good ISP?
  18. Main Types of Hardware Modems.
  19. Modem and Dialup Connection Speed.
  20. Non Dialup Connections.
  21. Premium Rate Dialup Connection Fraud.
  22. Remote Access Numbers Dialup Scam.
  23. Speed up the Initial Connection Process.
  24. Steps To Check if your Modem does not Dial.
  25. Steps to Troubleshoot Slow Dialup Connection Speed.
  26. Types of Modem.
  27. Understanding the High Speed Dialup Connection.
  28. Understanding Internet Connection Terminology.
  29. Understanding the Working of a Modem.
  30. V.92 Modem Technology FAQ.

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