Learning Center / Product Basics / A to Z
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AAA Server
Remote user authentication system. An AAA server handles the following tasks. Authentication: determines the identity of the users. Authorization: determines the network services available to authenticated users once they are connected to the network. Accounting: keeps track of the users' network activity.
 
AAC
AAC (Advanced Audio Coding) is a standardized digital audio compression method. AAC is also known as MPEG-4 AAC because it is included in the Moving Pictures Experts Group (MPEG) MPEG-4 standard.
 
AAL
AAL converges packets from upper layers into ATM cells as defined by ITU-T, ETSI and the ATM Forum. AAL has several service types and classes of operation to accommodate different types of classes.
 
Access Point
A device that allows wireless-equipped computers and other devices to communicate with a wired network. Also used to expand the range of a wireless network.
 
Adapter
A device that adds network functionality to your PC or other device, such as a printserver.
 
Ad-hoc
A group of wireless devices communicating directly with each other (peer-to-peer) without the use of an access point.
 
A-end (IPSec)
This is the end of a VPN tunnel opposite the Z-end (see also Z-end).
 
AES (Advanced Encryption Standard)
An encryption method that supports these key sizes: 128-bit, 192-bit, and 256-bit.
 
A-Law
A-Law and Mu-Law are Pulse Code Modulation (PCM) techniques that dictate forms of compression for audio signals. They are widely-used standard methods of coding voice as they improve signal-to-noise ratio without increasing the amount of data. Mu-Law is a standard in North America; A-Law in Europe.
 
ASIC (Application Specific Integrated Circuit)
A circuit designed for a specific application, as opposed to a general purpose circuit, such as a microprocessor. Using ASICs as components in electronic devices can improve performance, reduce power consumption, increase safety and reduce costs.