GL-2
Issue 9 October 1998
363-206-204
GLOSSARY
A
ABN
Abnormal (status condition) indicated by an LED on the user panel. An abnormal
condition, loopback, forced manual switch, etc., is initiated through a craft inter-
face terminal command
ACO/TST
Alarm Cutoff and Test — The name of a pushbutton on the user panel. it retires an
audible office alarm. It has other functions when used in combination with other
pushbuttons and controls.
Active
Active identifies a 1+1 protected OC-n line which is currently selected by the
receiver at either end as the payload carrying signal or a 1x1 or 1xn protected cir-
cuit pack that is currently carrying service. (See Standby.)
ADM
Add/Drop Multiplexer.
AGNE
Alarm Gateway Network Element — A user designated Network Element in an
alarm group through which members of the alarm group exchange information.
AIS
Alarm Indication Signal — A code transmitted downstream in a digital network that
shows that an upstream failure has been detected and alarmed.
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 ampli-
tude, and in which binary zeros are represented by signal elements that have zero
amplitude.
ANSI
American National Standards Institute. The United States organization that coor-
dinates creation of voluntary standards.
APS
Automatic Protection Switch - Switching of receivers in response to an indication
of loss of signal or other problem with a transmission path.
AS&C
Alarm, Status, and Control
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