Alarms; Figure 3. Alarm Processing - ADC PG-FlexPlus AMU-912 Manual

SCP-AMU912-010-06H
A
LARMS
The AMU-912 communicates with each CO Line Unit and MUX in the shelf to provide a summary of active shelf-
level alarms (Figure 3). The CO Line Unit and MUX units inform the AMU-912 of alarms becoming active and
inactive. A summary of alarms for each unit is maintained on the AMU-912. Active shelf alarms are displayed by the
front panel LEDs and through audible and visual relay contacts. These alarm indications are also obtainable through
the Craft Interface. An ACO is provided to silence audible alarms. A shelf ID relay is provided to allow shelf fault
isolation when more than one shelf system is located in a bay. The shelf ID relay is activated when any visual alarm
is active in the shelf.
The AMU-912 can also accept external environmental alarms via the backplane DB-25 connector; however, the
functionality of the DB-25 must be changed to ENV-ALARMS setting rather than the default setting of CRAFT-PORT
(refer to CONFIG — Shelf Options on page
as an external alarm input source.
External Alarm Relays
Critical
Audible
Critical
Visual
Major
Audible
Major
Visual
Minor
Audible
Minor
Visual
Shelf
ID
Front panel ACO LED (Yellow)
6
66). The DB-25 connector can function as a craft access port or operate
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
Front panel ACO pushbutton
Front panel alarm LEDs
Critical (Red)
Major (Red)
Minor (Yellow)

Figure 3. Alarm Processing

External environmental
alarms via backplane
DB-25 connector
Alarms from CO line
units and MUs by means
of backplane communication
Management
or
Alarm Unit
Backplane external ACO pin
July 19, 2004
ADC Telecommunications, Inc.