Glossary - Ericsson HL950 Administrator's Manual

Multi Service Edge Device HL950
Administrator's Guide
10

Glossary

The glossary includes descriptions of both abbreviations and other terms used in this guide.
A
AAL – ATM Adaptation Layer
ATM Adaptation Layer: The standards layer that allows multiple applications to have data converted
to and from the ATM cell. A protocol used that translates higher layer services into the size and format
of an ATM cell
.
AAL1 – ATM Adaptation Layer Type 1
AAL functions in support of constant bit rate, time-dependent traffic such as voice and video
.
AAL2 – ATM Adaptation Layer Type 2
This AAL is still undefined by the International Standards bodies. It is a placeholder for variable bit
rate video transmission
.
AAL5 – ATM Adaptation Layer Type 5
AAL functions in support of variable bit rate, delay-tolerant connection-oriented data traffic requiring
minimal sequencing or error detection support
.
ABR – Available Bit Rate
A type of ATM service that provides a guaranteed minimum capacity but allows data to be bursted at
higher capacities when the network is free.
AES – Advanced Encryption Standard
AES is a symmetric 128-bit block data encryption technique. AES works at multiple network layers
simultaneously.
AH – Authentication Header
A security protocol used for source authentication.
ALG – Application Level Gateway
ALL – ATM Leased Line
ARP – Address Resolution Protocol
The procedures and messages in a communications protocol that determines which physical network
address (MAC) corresponds to the IP address in the packet.
ASP – ATM Service Provider
ATM – Asynchronous Transfer Mode
A network technology based on transferring data in cells or packets of a fixed size. The cell used with
ATM is relatively small compared to units used with older technologies. ATM creates a fixed channel,
or route, between two points whenever data transfer begins which makes it easier to track and bill data
usage across an ATM network.
Authentication
Identifying and validating a given user.
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June 2003