Appendix A: Connectors and LEDs
7750 SR-a4 and SR-a8 Installation Guide 145
9 Alarms Critical Red: Indicates that a critical condition exists, such as a fan failure, a
power feed failure, or a critical external alarm input detected
Unlit: No critical alarm conditions
Major Red: Indicates that a serious condition exists, such as an
over-temperature condition or a major external alarm input detected
Unlit: No major alarm conditions
Minor Amber: Minor condition exists, or a minor external alarm input detected
Unlit: No minor alarm conditions
10 Alarms port Port The alarms interface port is a D-type 15-pin receptacle. Refer to Alarms
Interface Port on page 217 for pinout assignments.
11 ACO/LT — The Alarm Cutoff/Lamp Test button verifies the operability of LEDs.
When you press and hold this button for three seconds, all LEDs on all
chassis modules (see exceptions below) should temporarily illuminate
and blink until the button is released. The ACO/LT button tests the
functionality and operability of all LEDs on the chassis and components
of the chassis. If any LED does not illuminate and blink, the LED may
not be functioning correctly.
This button also turns off all external alarm relay control bits until the
next new alarm condition.
Exceptions:
The LT has no affect on:
• the back-lit product name, which is always on when a PSU is
installed and running
• Pwr/Stat LED on the CPM
12 1PPS Port Timing output with subminiature version B (SMB) connector. The 1PPS
port is reserved for future use.
13 Compact
Flash
Memory
Card Slot
Slot The CF card slot accepts Type I and Type II CF cards. It can be used to
store accounting records, logs, and TiMOS images. It can also be used to
boot the system. Refer to the 7750 SR-a Release Notes for detailed
information about the supported Compact Flash storage devices
supported on the 7750 SR-a.
Table 58: 7750 SR-a CPM-a Connector and LED Descriptions (Continued)
Key Label/Part Sub-
category
Description
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