Glossary

Glossary

A

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.

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