Glossary
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A access identifier (AID)
A unique identifier used to address equipment slots and ports, as well as facility tributaries, that
are defined for the system architecture.
add/drop multiplexer/multiplexing (ADM)
A high-speed multiplexing function offered by SONET that allows lower-level signals to be added
to or dropped from an optical carrier channel. The connection to the add/drop multiplexer is
through a tributary channel at a lower SONET carrier rate or a specific digital speed (for example,
DS3 or DS1).
ADM
See “add/drop multiplexer/multiplexing” (p. GL-1) for definition.
AHPHG
High Power High Gain DWDM Amplifier. See “ALPHG” (p. GL-2) for related term.
AID
See “access identifier ” (p. GL-1) for definition.
AIM
See “alarm indication message” (p. GL-1) for definition.
AINS
Automatic in-service.
AIS
See “alarm indication signal” (p. GL-1) for definition.
alarm
External notification or display of a failure condition. The indication of failure is towards an
external system interface or via audible or visible indicators.
alarm indication message (AIM)
A return message sent from one network element (NE) to another NE that indicates it has received
a signal that is so degraded that it is raising an alarm.
alarm indication signal (AIS)
A signal sent downstream by an NE to indicate that its incoming signal has failed.
alarm list
A status report that lists active alarms on the NE.
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
GL-1
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