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2.3.2 Alarm Acknowledgment Pushbutton
The Alarm Acknowledgement (ALM ACK) reset pushbutton on the front panel resets the latch
for the alarm relay, which can reset the external device connected to the alarm relay terminal
block. ALM ACK does not reset or correct the alarm condition and the LED(s) will remain on
until the problem is resolved. See Figure 2.
When an alarm occurs in a multiple chassis system, look for the chassis with the STA LED lit
amber; that chassis is generating the alarm. Press ALM ACK on that CIM to turn off the external
device.
Check the alarm condition and resolve the problem. For more information about alarms, see
Chapter 3.
2.4
Clock Source for Linked CIMs
The clock source for the system depends on how the interconnecting chassis are configured.
Caution:
To prevent clock errors and ensure proper clocking, make sure that the link cables
connect the chassis in numeric order and Link Down to Link Up.
•
In a single chassis configuration, the CIM provides the primary clock to the management bus.
If the CIM clock fails, the DMM provides a redundant clock to the management bus.
•
In a multiple chassis configuration, the first CIM in the link provides the primary clock to the
management bus. If the clock fails in the first CIM, the next CIM in the link provides a
redundant clock to the management bus.
2.5
Power Up the Chassis
Switch on the power supply(s) for the chassis. The CIM receives power through the backplane.
During the power-on self-test, all LEDs light amber.
At the end of self-test, check for these LED conditions:
•
CLK lights Green if this CIM provides the clock; otherwise, CLK is Off
•
STA lights Amber (indicates a power cycle and must be reset)
•
MAJ and MIN are off
Press ALM ACK to change STA to Green.
If an alarm condition occurs in this chassis or another linked chassis:
•
For a minor alarm, MIN lights Amber and the Minor alarm contacts are latched
•
For a major alarm, MAJ lights Red and the Major alarm contacts are latched
Note:
The MAJ or MIN LEDs turn off only when the cause of the alarm is resolved and reset.
Pressing the ALM ACK switch resets only the alarm relays, which can turn off external
device(s).
EdgeAccess Universal Chassis System
Model 1202 CIM User Manual
2-3
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