GL-2 Issue 5 June 2000
363-206-208
Glossary
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 circuit 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 nor-
mally 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. The United States organization that coordinates
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
ASCII
American Standard Code for Information Interchange — A standard 8-bit code used for
exchanging information among data processing systems and associated equipment.
ASN.1
Abstract Syntax Notation 1
ATM
Asynchronous Transfer Mode
Auto
Automatic — One possible state of a DS1 or DS3 port. In this state, the port will auto-
matically be put "in service" if a good signal is detected coming from the DSX panel. If
that signal is then lost, deliberately or accidentally, an alarm will occur. The alarm can
be eliminated by resetting.
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