Alarm Pin Assignments
84
7210 SAS-M CHASSIS INSTALLATION GUIDE
3HE 10089 AAAA TQZZA Edition 01 Issue: 07
9.1 Alarm Port Pin Assignments
The alarm interface port is a DB-15 connector that supports a critical alarm output, a
major alarm output, and four alarm inputs. When your system has a critical or major
alarm, the CPU will cause the alarm relay to issue the alarm output and turn on the
critical or major LED. If you push the alarm cut off (ACO) button, the relay will be
released but the LED will stay on until the alarm is cleared.
Figure 16 DB-15 Alarm Connector
The system signals the appropriate alarm output for the following events:
• Fan failure — critical alarm is raised.
• One power module failure — critical alarm is raised. The critical alarm is
cleared and a major alarm is raised if the failed power supply is removed.
• Chassis temperature threshold exceeded — major alarm is raised.
The system also supports four alarm inputs. The input voltage range is from 24V to
48V. If an alarm input is active, the CPU will process it, output it to the CLI, and issue
an SNMP trap. An alarm input can also be configured to drive the appropriate alarm
output pin. Please refer the System Basics user guide for more details on configuring
the alarm inputs.
See Table 18 for the alarm interface port pin assignments.
Table 18 Alarm Interface Port Pin Assignments
Pin Name Function
1 CRIT_ALARM_CNTR Common contact for critical alarm relay
2 CRIT_ALARM_NO Normally open during critical alarm state
3 MJR_ALARM_NC Normally closed during major alarm state
4 N/C Not connected
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