Modem

A modem is a device that converts data from binary code; which is used by computer to interpret to analogue signals that can be transmitted over the telephone network.



There are two types of modems:

• Consumer voice-grade modems Most off-the-shelf modems are designed to allow PC users to communicate over the voice phone system. The modems employ compatible communication techniques that comply with several standards, most notably the ITU V series standards (previously called the CCITT standards).
  
• Broadband modems These are modems for nontelephone system connections. A company may set up its own dedicated lines or microwave towers and use broadband modems to achieve very high data rates between those sites.