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AIS
ANSI
ATM
ATM Layer
ATM25
ATU-C & ATU-R ADSL Transmission Unit, Central or Remote. This is a
B
Bandwidth
Baud Rate
A B C D E F G H I
Issue 7 - 05/02
Alarm Indication Signal - an all ones signal sent down
or up stream by a device when:
• it detects an error condition,
• receives an error condition
• receives an error notification from another unit in
the transmission path.
American National Standards Institute - the national
co-ordinating organisation for voluntary standards in
the US.
Asynchronous Transfer Mode - a form of digital
transmission based on the
units of information known as cells. It is suitable for
the transmission of image, voice, video and data.
The protocol layer that relays cells from one ATM
node to another. It handles most of the processing and
routing activities including:
•
Switching
• multiplexing/demultiplexing
• operation and maintenance of virtual circuits
• traffic shaping and congestion control
As defined by the ATM Forum. This is a 25.6 Mbits/p
cell-based user interface based on the IBM token ring
network.
device at the end of an ADSL line between the
subscriber premises (ATU-R) or a telephone switch
(ATU-C).
A measure of the throughput of a system or network.
The number of line signal transitions per second - or
the rate at which data is transmitted over the serial
port.
L N O P Q R S T U V W X
J K
Glossary & Abbreviations
Switching
of fixed-length
Y Z
Glossary-3
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