Abort - To stop doing something. Particularly, to exit a software program or stop receiving or sending a message.
Access - (1) (verb) to get use of something, or (2) (noun) refers to a particular level or security clearance of use of something (i.e., one's "
access" to the mainframe).
Account - A term that refers to information that a particular telecom system has about you, and
typically refers to an ID number or your personal information.
ACK - A character
transmitted by a
receiver that acknowledges that some particular
reception took place.
Acoustic Coupler - This is an acoustic modem that transfers data over phone lines by tones and sounds instead of electronically. Old-fashion handsets fit into a the modem to
transmit information.
Acoustic Modem - This is simply a modem that uses an acoustic coupler.
Adaptive Dialing - A modem will try dialing with tones initially and will then dial in pulse if necessary (i.e., if tone dialing is ignored).
ADC - This stands for Analog-to-Digital Conversion.
ADSL - This stands for Asymmetrical Digital Subscriber Line and is the
typical DSL service that connects customers to the internet. Preexisting channels in telephone lines are used to
transmit data to and from the net.
Alias - This is an assumed name with which
bulletin board users may post messages.
Altitude - the distance an object appears to be above the horizon. This angle is measured up from the closest point on the horizon.
Ampersand - The character "&", which usually is written to
signify "and".
Amplitude Modulation (AM) - The signal carries the desired information content by varying the amplitude or height of the
carrier wave.
Amplifier - A device that is used to boost the strength or
intensity of an electronic signal.
Analog - Transmitting information that is characterized by
continuouslyvariable quantities (such as with AM or FM). This is different from digital
transmission, which is characterized by discrete bits of information
transmitted in numerical steps.
Analog-to-Digital Conversion (ADC) - Converting analog signals to their digital
representation. (DAC represents the reverse translation.)
ANIK - The Canadian domestic
satellite system that
transmits the CBC's (Canadian Broadcasting Corporation's)
network feeds throughout Canada. This system also carries data and long distance voice services throughout Canada.
Anonymous - An unknown author of a software program or message.
ANSI - This stands for American National Standards Institute, which was founded in 1918 and creates
voluntary standards for data
transmissions, protocols, and high-level languages.
Answer Back - This is a signal sent to a
transmitter of information that, in effect, says "I am ready to receive information now." It can also
signify the successful
reception of information.
Answer Mode - A modem's condition in which it is ready to receive data.
Answer Supervision - A signal sent to the telephone company's central office that says a call has been connected (primarily used for long-distance phone calls to start the billing time).
Antenna - A device for
transmitting and receiving radio waves. Depending on their intended use,
antennas could be a single piece of wire, a di-pole, a grid, a helix, a parabolic
satellite dish, etc.
Aperture - A cross-sectional area of the part of the
antenna that is to be exposed to the received
satellite signal.
Apogee - The point in an elliptical
satellite orbit which is
farthest from the surface of the earth.
Apogee Kick Motor (AKM) - The
rocket motor that is fired to deploy the
satellite into geostationary orbit.
Append - To add the contents of one thing to that of another.
Archive - This is a backup of a file in
compressed or un
compressed form.
Area code - This is a 3-digit number,
preceding normal 7-digit telephone numbers, that are used by the telephone company to
designate a geographic billing area in the US.
ASCII - This stands for American Standard Code of Information Interchange, and it is a popular code for representing letters, numbers, and punctuation into a digital format.
Asterisk - This is the character "*".
Asynchronous Transmission - This is a method of data
transmission that allows characters to be sent
irregular intervals.
AT Command - This is the character "@" and usually means "at".
AT&T - American Telegraph and Telephone, the inventors of the first modem.
Attended Mode - This is the mode in which two or more users manually enter commands to send or receive files.
Attenuation - The
phenomenon that is the loss in the power of electromagnetic signals between their
transmission and receiving points.
Audio Monitor - This is a speaker that is part of the modem and allows you to hear sound on the phone line.
Auto Answer - This is when a modem, phone, or other device has the capability to
automatically set up a connection with an incoming
transmission.
Auto Baud - The ability of a modem to adapt its communication rate if the computer it is communicating with is unable to connect at the requested speed.
Auto Dial - When a phone or other device allows the dialing a one or a few numbers to cause the dialing of a long string of numbers.
Auto Redial - When a phone or modem redials a number if it encounters a busy signal the first time around.
Auto Reply - To send a message immediately upon the
reception of one.
Automatic Frequency Control (AFC) - A circuit that can
automatically control a signal's
frequency.
Automatic Gain Control (AGC) - A circuit that
automatically governs the gain of an amplifier so that the output signal level remains
essentially constant (even if there are varying input signal levels).
AZ/EL Mount - This is an adjustable
antenna mount.
Azimuth - Generally, this is the angular distance along the horizon to the
location of the object (measured in degrees). By convention, azimuth is measured from north, rotating towards the east, along the horizon. Regarding
satellites
specifically, it is the
horizontal angle of
rotation that a parabolic
antenna located on the ground must be rotated through to point towards a
specificsatellite in space.
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Access - The process used for communication between your computer and the Internet.
Access Lines - A telephone line running from the telephone company's central office to a point on your property.
Access Line Equivalents - A
representation of the number of
access lines that a system could hold.
Adobe Acrobat Reader - A software program developed by Adobe Systems, Inc., used to view files in PDF format. The software displays documents with the same layout and design as the original.
ADSL (Asymmetric Digital Subscriber Line) - A new modem technology that allows existing twisted pair telephone lines to
access the Internet at T-1 speeds.
ASCII (pronounced: ask-ee) - ASCII is an acronym for American Standard Code for Information Interchange, a code that represents the most basic letters of the Roman alphabet, numbers, and other characters used in computing. ASCII characters allow us to
communicate with computers, which use their own language called binary made up of 0s and 1s. ASCII files are also called text files.
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