Centillion 1200N ATM Switch User Manual B-1
NTP 297-8103-903

Glossary

AAAC
Actual Allocated Capacity
AAL
ATM Adaptation Layer: The standards layer that allows multiple applicat ions 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.
AAL Connection
Association established by the AAL between two or more next higher layer entities.
AAL-1
ATM Adaptation Layer Type 1 : AAL functions in support of cons tant bit rate, time-
dependent traffic such as voice and video.
AAL-2
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.
AAL-3/4
ATM Adaptation Layer Type 3/4: AAL functions in support of variable bit rate,
delay-tolerant data traffic requiring some sequencing and/or error detection
support. Originally two AAL types, i.e. connection-oriented and connectionless,
which have been combined.
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