DPP Hardware 2-21
DPP Product Guide DPP001 and up
ONL (Only)
Yellow status lamp (ONL) indicates which processor has sole, non-
transferable operational control of the system. The other unit is not available
for system functions in the event of a malfunction in the ONLY unit. Non-
availability of a unit could be due to a fault in a unit or normal maintenance
activity on a unit. In this operating condition, both the PRI and ONL status
lamps are lit for the active processor. The ONLY condition must be manually
initiated at the mode key switch and rocker switch.
CRIT (Critical)
Red indicator lamp (CRIT) when lit, indicates that the system may no longer
be capable of performing its design function of data collection, storage,
retrieval, and forwarding. The situation requires immediate corrective action
so that the performance of the system may return to its design function.
Critical alarms are normally configured to reflect conditions where the
probability of data loss is very high.
MAJ (Major)
Red indicator lamp (MAJ) alarm lamp, when lit, indicates that the system is
in danger of loss of operational capability. A fault, or faults, condition exists,
which, if not corrected, may result in loss of functional capability. Major
alarms are normally configured such that if corrective action is not taken
immediately, there is a high probability of subsequent faults resulting in loss
of data.
MIN (Minor)
Yellow indicator lamps (MIN) alarm lamp, when lit, indicates that one
processor unit (A or B) has developed a fault condition; there has been no
degradation of system performance as relates to overall design capability.
This situation does not require immediate attention, though delay could lead
to worsening of the situation.
Other indicators
The system contains no audible alarm devices. However, relay contacts are
provided for the routing of alarm signals to the office alarm system.
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