Table of Contents
Advertisement
Overview
The Alarm Card resides in the OCM shelf and provides alarms for the power supplies via shelf
alarm bus and the associated power supply modules. The Alarm card also provides the following
contact alarm features:
•
provides contacts to activate local and remote customer alarm systems.
•
provides local and remote indication of alarms in a system.
•
provides separate cutoff controls for local and remote systems.
Typically, the alarm outputs are used to drive the visual and audible alarms within a central office.
There are four types of alarms: Major, Minor, Power Good (Major), and power status (Minor).
Major and Minor alarms are defined depending on the module(s) used in the system. When an alarm
is detected, the associated module activates circuitry on the Alarm Card. To assure that transient
signals do not trigger the alarm, there is a built-in time delay of approximately 100 ms. When an
alarm exists, front panel LED indicators light, providing a local indication (minimum on-time of
approximately 0.75 seconds). At the same time internal relays are activated, providing external
control of visual and/or audible indications.
The Alarm Card receives power when you insert it into the shelf. Inserting or extracting it does not
cause any errors in the system. You may make Major, Minor and Audible Alarm connections by
wire wrapping to connectors on the Alarm Interface Adapter (refer to Table 7-3 on page 7-5). The
Alarm Interface Adapter mounts on the rear of the shelf at Zone 3 at the position assigned to the
Alarm Card slot. An Alarm Card power failure sets all alarms except the Audible Alarm. To
deactivate the alarms, extract the Alarm Card from the shelf or enclosure. Use the ACO front panel
switch to cut-off the external audible alarms; the front panel alarm indicators remain ON.
Note
When inserting an Alarm Card into a powered shelf, Major, Minor and Audible Alarms go ON for
approximately 0.75 seconds then OFF.
When applying power to a shelf, the Major, Minor, and Audible Alarms go ON for approximately 0.75
seconds then OFF.
036R340-000
Issue 16
Chapter 7:
Office Connunications Manager OCM-1000/OCM-2000
Installation & Operation
Alarm Card
7-1
Advertisement
Table of Contents
