Agilent Technologies AuroraPresto, User Manual

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Aurora Presto
- User Guide
Glossary-2 481801
A B C D E F G H I
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A B C D E E G H I J
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N O P Q R S T U V W X
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A
AAL
ATM Adapation 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.
AAL3/4
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, that is
connection-oriented and connectionless, which have
been combined.
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. This is an ATM layer service
provided by the network. The flow rate is controlled
to use the available bandwidth specified by the service
provider, according to the amount of traffic using the
network.
ADSL
Asymmetric Digital Subscriber Line - as defined by
ANSI T1.413. Modems attached to twisted pair
copper wires that transmit from 1.5 Mbps to 9 Mbps
downstream (to the subscriber) and from 16 kbps to
800 kbps upstream, depending on line distance.
481801-7.book Page 2 Thursday, May 23, 2002 10:46 AM