Most definitions found in this glossary are adapted with permission from this text book:
Maheu, M., Whitten, P., & Allen, A. (2001). eHealth, Telehealth & Telemedicine: A Guide to Startup and Success. New York: Jossey-Bass.
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The prevention of unauthorized access to information through the use of policies or software that determine who can have access to what data contained on a computer network (both within and outside the organization).
Describing wave-shaped electrical signals that continuously change size and shape depending on the information being transmitted. Signal variations lead to differences in volume, voice, and pitch.
Describing a communication system, such as e-mail, in which there is a lapse between the time a message is sent and the time it is received.
Asynchronous transfer mode (ATM)
A data transmission technology in which a start signal precedes each data packet, and one or more stop signals follow it. These individual packets of information are easily prioritized and routed, which enables the seamless integration of audio, video, and data. ATM also denotes the complete system of protocols and equipment associated with packet-based communication networks.
Two-way remote voice communication among multiple individuals.
A comprehensive or selective method of monitoring every operation an individual performs on information.
A method of verifying the identity of the individual sending or receiving information by use of passwords, biometrics, keys, digital or electronic signatures, and other automated identifiers.
A high-speed, high-capacity transmission facility that interconnects lower-speed distribution channels from smaller branches of the computer or telecommunication network.
The measure of a communication channel's range of frequencies that a signal occupies. Generally, higher bandwidth carries information faster than lower bandwidth. In an analog transmission, the speed of information transfer increases in terms of megahertz (cycles per second); in digital transmissions, speed is measured in megabits per second (Mbps).