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Glossary
GL-2 Issue 1 December 1997
AMI
Alternate Mark Inversion — A line code that employs a ternary signal to convey binary
digits, in which successive binary ones are represented by signal elements that are
normally of alternating, positive and negative polarity but equal in amplitude, and in which
binary zeros are represented by signal elements that have zero amplitude.
ANSI
American National Standards Institute
APS
Automatic Protection Switch
ARM
Access Resource Manager
AS&C
Alarm, Status, and Control
ASCII
American Standard Code for Information Interchange — A standard 8-bit code used for
exchanging information among data processing systems and associated equipment.
ATM
Asynchronous Transfer Mode
Auto
Automatic — One possible state of a DS1 or DS3 port. In this state, the port will
automatically be put "in service" if a good signal is detected coming from the DSX panel.
Automatic Protection Switch
A protection switch that occurs automatically in response to an automatically detected
fault condition.
Automatic Synchronization Reconfiguration
A feature that allows another synchronization source to be automatically selected and the
synchronization source provisioning to be automatically reconfigured in the event of a
synchronization source failure or network synchronization change, for example, a fiber
cut.
AUXCTL
Auxiliary Control — The name of the slot to the left of the SYSCTL slot on the DDM-2000
OC-3 and FiberReach wideband shelves and to the right of the SYSCTL slot on the
DDM-2000 OC-12 shelf.
Available Time
In performance monitoring, the 1-second intervals.
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