FortiGate-5050 chassis FortiGate-5050 shelf alarm panel
FortiGate-5050-R Chassis Guide
01-30000-87717-20090108 11
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Figure 5: Connections between the shelf managers and the shelf alarm panel
Shelf alarm panel telco alarms

The shelf alarm panel telco alarm interface relay circuits are capable of carrying 60 VDC

or 1 A with a max. rating of 30 VA. The shelf alarm panel accepts timed pulse inputs for

clearing minor and major alarm states. Reset is accomplished by asserting a voltage

differential from 3.3 V to 48 V for between 200 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.

The alarm LED reset button activates the alarm cutoff (ACO) state for major, minor, and

user-defined alarms. You cannot reset critical alarms with the alarm LED reset button.

When the ACO state is activated, active alarm LEDs blink and all of the alarm relays are

deactivated. The alarm reset button activates the ACO state but does not clear the alarm

completely.

Figure 6: The telco alarm connector (DB-15 male)
5050SAP
SERIAL
1
SERIAL
2
ALARM

Primary Shelf Manager (Right)

I²C-Switch
PCA9545
Buffer
LTC4300

ShMM-500

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sub-C²I
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Secondary Shelf Manager (Left)

I²C-Switch
PCA9545
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sub-
C²I
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Ielo
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o
Clai
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S
Buffer
LTC4300

ShMM-500

0HC
3H
C
0HC
3HC
1
915
8