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AC-3:
Audio Coding-3. The previous name for Dolby® Digital, the digital audio industry standard for technology that provides six channels of audio. Also referred to as 5.1, Dolby(R) Digital creates a surround sound effect with front left, front right, front center, rear left, rear right, and subwoofer audio signals.
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Access_Point:
(AP) Wireless access points are specially-configured nodes on wireless local area networks (WLANs). Access points act as a central transmitter and receiver of WLAN radio signals.
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Ad_Hoc_Network:
A wireless network composed only of stations and no access point. Also referred to as an Independent Basic Service Set Network (IBSS Network).
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Address_Book:
An address book is a place to store email contact details for all the people you know. You can share these contacts with other sources, such as a Microsoft Outlook address book or a Palm Desktop device.
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Address_Groups:
Address groups let you send email to a list of email addresses simultaneously. You can build address groups that include your stored addresses, addresses that you have not stored, other shortcuts, and even other address groups.
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ADSL:
Asymmetrical Digital Subscriber Line. ASDL is a method for moving data over regular phone lines. An ASDL circuit is much faster than a regular phone connection, and uses the plain twisted pair wiring already carrying phone service to subscriber's homes to transmit video signals and high-speed data to the home. ADSL can also be used to offer other applications, such as Internet service.
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Aerial_Cable:
A cable physically supported by poles or similar overhead structures.
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Allowed_Domains:
Specific domains from which you want to receive email messages.
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Amplifier:
An electronic device used to increase the strength of a signal.
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Amplifier_Cascade:
A group of amplifiers and long spans of coaxial cable connected together in a series arrangement, for the purpose of transporting signals over long distances.
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Analog_Signals:
Signals which are smooth electrical representations of video, voice and data information (rather than pulse signals, like digital).
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Anamorphic:
Content that is enhanced for widescreen (16.9) televisions through the inclusion of increased vertical picture information, or a "letterbox". A widescreen television stretches the picture horizontally to match the increased vertical picture information, resulting in a clearer and sharper picture intended to be displayed only on a widescreen TV. Since a standard screen TV must letterbox widescreen images to fit them to the screen, much of the vertical resolution is lost. Widescreen television do not need to letterbox these images, and therefore can offer up to 33% more vertical resolution while viewing the same anamorphic DVD.
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Anonymous_FTP:
Using the FTP function of the Internet without a secret login ID and password. You just use anonymous as your login and your email address as the password. Often permitted on large systems that share some of their files with outside users who otherwise would not be able to login.
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Archie:
An ancient Internet search tool, not used much since way back in the good old days of 1994. It's an archive of filenames maintained at Internet FTP sites. Don't pine its passing, you didn't miss anything - the Web is much more fun.
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ASCII:
(American Standard Code for Information Interchange) A data specification that standardizes the representation of 256 basic computer characters, including the English alphabet, numbers and punctuation.
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Aspect_Ratio:
The ratio of a picture's horizontal resolution, measured in either pixels or lines, to picture's vertical resolution, also measured in either pixels or lines. Aspect ratio is always measured in width to height (e.g., 16:9). Standard screen televisions have an aspect ratio of 4:3. Widescreen television have an aspect ratio of 16:9 and allow for a more panoramic viewing experience.
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Asynchronous:
Without regular time relationship; unexpected or unpredictable with respect to the timing of another element or assembly in a system. Asynchronous transmission, also called "start-stop" transmission, employs individually synchronized information characters or words. This is usually accomplished with the use of start and stop elements. The gap between each character is not necessarily of fixed length.
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ATM:
(Asynchronous Transfer Mode) This is a special connection-oriented packet-like switching and multiplexing technique (using fixed sized cells), that gives the user high bandwidth and low delay.
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Attachment:
A picture, document, program, or any other type of file that accompanies an email message.
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Authentication:
The process a station uses to announce its identify to another station. IEEE 802.11 specifies two forms of authentication: open system and shared key.