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Modem: Modulator/demodulator. A device that transforms a typical two-level computer signal into a form suitable for transmission over a telephone line. Also does the reverse--transforms an encoded . . . View Full Definition

Software Modem: A modem implemented entirely in software. Software modems rely on the computer's processor to modulate and demodulate signals.

External Modem: A modem that is separate from the actual computer system and is self-contained in its own box. Because of the additional expense of creating the housing for the external modem, they tend to . . . View Full Definition

Fax Modem: A device you can attach to a personal computer that enables you to transmit and receive electronic documents as faxes. A fax modem is like a regular modem except that it is designed to trans . . . View Full Definition

Internal Modem: A modem that resides on an expansion board that plugs into a computer. In contrast, an external modem is a box that attaches to a computer's COM port via cables.

Cable Modem: A cable modem is a type of Internet connection that is transmitted through a coaxial cable. The benefits of this technology are that you are able to achieve much faster speeds through a cabl . . . View Full Definition

Cable Modem Termination System (CMTS): Cable Modem Termination System. Typically, this system is found in a cable companies headend or distribution hub. Its purpose is to provide a high-speed data service to cable subscribers.

Modem Pools: Racks of modems used to deliver reliable cellular data communications.

Modem Speeds: The speed at which you connect to the Internet through your computer's modem. They include 14.4, 28,8, 33.6 and ISDN. T1 and T3 are high speed connections that don't require a modem.

Remote Access Services (RAS): A feature built into Windows NT that enables users to log into an NT-based LAN using a modem, X.25 connection or WAN link. RAS works with several major network protocols, including TCP/IP, I . . . View Full Definition