Alcatel-Lucent 1643 AMS User's Operation Manual page 682

Glossary
Administrator
See ITM-SC System Administrator.
Agent
Performs operations on managed objects and issues events on behalf of these managed
objects. All SDH managed objects will support at least one agent. Control of distant
agents is possible via local "Managers".
Alarm
The notification (audible or visual) of a significant event. See also Event.
Alarm Indication Signal (AIS)
Code transmitted downstream in a digital Network that shows that an upstream failure
has been detected and also alarmed if the upstream alarm has not been suppressed. Also
called to as All OneS.
Alarm Severity
An attribute that defines the priority of the alarm message. The way in which alarms are
processed depends on the severity.
Aligning
Using a pointer to indicate the head of a virtual container, for example, to create an
Administrative Unit (AU) or a Tributary Unit (TU).
ALS
Automatic Laser Shutdown
Alternate Mark Inversion (AMI)
A line code that employs a ternary signal to convert binary digits. In this line code
successive binary ones are represented by signal elements that are normally of
alternately positive and negative polarity but are equal in amplitude, binary zeros are
represented by signal elements that have zero amplitude.
American Standard Code for Information Interchange (ASCII)
A standard 8-bit code that is used to exchange information among data processing
systems and associated equipment.
Anomaly
A difference between the actual and the desired operation of a function.
ANSI
American National Standards Institute
APS
Automatic Protection Switching
AS
Alarm Suppression assembly
Assembly
Gathering together of payload data with overhead and pointer information (an indication
of the direction of the signal).
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GL-2 Alcatel-Lucent - Proprietary
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Issue 4, May 2007