Glossary
ZyXEL Networking Glossary
Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.
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A-end (IPSec)
This is the end of a VPN tunnel opposite the Z-end (see also Z-end).
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.
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.
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