Cisco ONS 15454 Series Reference Manual page 53

ONS_15454_Reference_Manual_R8.5.x_--_Shelf_and_Backplane_Hardware
Alarm Contact Connections
The alarm pin field supports up to 17 alarm contacts, including four audible alarms, four visual alarms, one
alarm cutoff (ACO), and four user-definable alarm input and output contacts.
Audible alarm contacts are in the LOCAL ALARM AUD pin field and visual contacts are in the LOCAL
ALARM VIS pin field. Both of these alarms are in the LOCAL ALARMS category. User-definable contacts
are in the ENVIR ALARM IN (external alarm) and ENVIR ALARM OUT (external control) pin fields.
These alarms are in the ENVIR ALARMS category; you must have the AIC-I card installed to use the
ENVIR ALARMS. Alarm contacts are Normally Open (N/O), meaning that the system closes the alarm
contacts when the corresponding alarm conditions are present. Each alarm contact consists of two wire-wrap
pins on the shelf assembly backplane. Visual and audible alarm contacts are classified as critical, major,
minor, and remote. Figure 1-29 shows alarm pin assignments.
Visual and audible alarms are typically wired to trigger an alarm light or bell at a central alarm collection
point when the corresponding contacts are closed. You can use the Alarm Cutoff pins to activate a remote
ACO for audible alarms. You can also activate the ACO function by pressing the ACO button on the
TCC2/TCC2P card faceplate. The ACO function clears all audible alarm indications. After clearing the
audible alarm indication, the alarm is still present and viewable in the Alarms tab in CTC. For more
information, see the External Alarms and Controls.
Figure 1-39: ONS 15454 Backplane Pinouts 53