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14-Slot AdvancedTCA Shelf
11596-100/-101/-102/-103
4.2 Telco Alarms
4.2.1 Telco Alarm Interface
The SAP provides a Telco Alarm interface on the DB15-male connector.
Three relay outputs are used for remote alarm distribution, reflecting the state of
the three Alarm LEDs. The relays are capable of carrying 72 VDC or 1 A with a
max. rating of 30 VA.
4.2.2 Telco Alarm LEDs
The Shelf Alarm Panel provides the Telco Alarm LEDs. These LEDs indicate
presence of Critical, Major and Minor alarms as follows:
Table 4: Telco Alarm LEDs
Off
On
Flashing
4.2.3 Alarm Silence Push Button
The Alarm Silence push button on the Shelf Alarm Panel faceplate deactivates
the alarm relays. During the time Alarm Silence is activated, the Alarm LEDs
flash. By pressing the Alarm Silence push button a second time, the alarm relays
are reactivated and the Alarm LEDs are solid.
The Alarm Silence push button only activates the Alarm Silence state, but
does not reset the alarms. If the silence interval (default 600 s) is exceeded
without resolving the alarms, the alarms will be re-initiated.
4.2.4 Alarm Reset
Hardware Reset:
Two relay inputs at the DB15 connector are used to reset the Minor and Major
alarm state.
The reset inputs accept timed pulse inputs for clearing Minor and Major alarm
states. Reset is accomplished by asserting a voltage differential from 3.3 VDC
to 72 VDC for between 200 ms and 300 ms. The acceptance voltage range is
from 0 to 48 VDC continuous (handles up to 60 VDC at a 50% duty cycle). The
current drawn by a reset input does not exceed 12 mA.
There is no hardware reset (reset input) for the Critical Alarm state.
Software Reset:
The RMCP and CLI functions can be used to set and reset the Telco Alarms
(incl. Critical Alarm). See the Pigeon Point Shelf Manager External Interface
Reference for more information.
www.a-tca.com / www.schroff.biz
State
No alarm active
Alarm active
Alarm active, but silenced
Description
23
Maintenace
R1.1, July 23, 2008
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