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Glossary
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ACK (Acknowledge)
Control Character transmitted by a receiving device as an affirmation to a sending device.
Alphanumeric
Roman Letters (alphabetic) and Arabic numbers (numeric).
Amplitude
The height of a waveform measured in volts.
Amplitude Modulation (AM)
Transmission of information by varying the amplitude of a carrier signal.
Analog Data
Data in the form of continuously variable physical qualities. Compare with Digital data.
Analog signal
A signal such as voice or music that varies in a continuous manner (smooth transitions to
different levels).
ANSI
American National Standards Institute, primary standards development body in the USA.
ASCII
American Standard Code for Information Interchange. Pronounced as-kee. A code by which
alphanumeric, punctuation and control characters, commonly found on computer keyboards, are
each assigned a unique value between 0-127 (decimal).
Asynchronous
A data transmission in which the time between characters may vary. Characters are delimited by
start and stop bits.
Attenuation
The loss of power through transmission equipment, lines or other communication devices.
Auto answer
A modem capability that allows automatic pick-up — by the modem — when the phone
answers.