Alarm Cut-Off (ACO/TST)
A push-button on the SYSCTL used to silence audible alarms.
Alarm Gateway Network Element (AGNE)
A defined NE in an alarm group through which members of the alarm group exchange
information.
Alarm Indication Signal (AIS)
A code transmitted downstream in a digital network that shows that an upstream failure has
been detected and alarmed.
Alternate Mark Inversion (AMI)
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.
American Standard Code for Information Interchange (ASCII)
A standard 7-bit code that represents letters, numbers, punctuation marks, and special characters
in the interchange of data among computing and communications equipment.
AMI
Alternate Mark Inversion
ANSI
American National Standards Institute
APD
Avalanche PhotoDiode
APS
Automatic Protection Switch
APS Channel
The signalling channel carried in the K1 and K2 bytes of the SONET overhead on the
protection line. It is used to exchange requests and acknowledgments for protection switch
actions.
ASCII
American Standard Code for Information Interchange
Auto
Automatic
....................................................................................................................................................................................................................................
G L O S S A R Y
G L - 2
Lucent Technologies
365-372-333 R2.1
Issue 4, June 2005