Appendix D: CPM-a Pinout Assignments
7750 SR-a4 and SR-a8 Installation Guide 217
Alarms Interface Port
The alarms interface port is a D-type 15-pin 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 causes 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 81 shows the DB-15 Alarm Connector. Pinouts are numbered as follows:
• top row: right to left, pins 1 to 8
• bottom row: right to left, pins 9 to 15
Figure 81: DB-15 Receptacle Alarm Connector
The system signals the appropriate alarm output for the following events:
• Fan failure - Critical alarm is raised.
• One Power Supply 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 24 VDC to 48
VDC. 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 activate the appropriate alarm output
pin.
6 NC — Not connected
7 NC — Not connected
8 NC — Not connected
Table 110: BITS Port Pinouts—RJ-45 Female (Continued)
Pin Signal Direction Description
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