PNC-DUP (PNC Duplication)
Issue 1 May 2002
8-1289555-233-143
■ Standby DS1Cs amber LEDs are off.
■ DS1C facility green LEDs are on if the corresponding facility is equipped.
PNC State of Health
PNC-DUP software monitors the health of the two PNCs as determined by their
state of health (SOH) vectors, and initiates an interchange when the health of the
active falls below that of the standby (unless prevented from doing so by a PNC
lock, busyout, or antithrashing mechanism). Potentially service-disrupting faults
which occur in PNC components are reported to PNC-DUP and incorporated in
the state of health for the affected PNC. The SOHs of both PNCs are displayed
on the status pnc form.
Screen 8-7. Status PNC Screen with Standby PNC Fully In-Service
PNC State-of-Health Indexes
The Inter-PN and Inter-SN Indexes form the state of health vector, which is used
to track and compare the states of health of both PNCs. The fields making up the
indexes are two digit numbers separated by periods (.), with each field
representing a different class of faults. The fault class fields are arranged in order
of decreasing importance from left to right. In other words, each field in the index
supersedes the following fields in determining which PNC is healthiest. A fault
class drives an interchange only when all of the higher priority fault classes are
equal. A zero entry indicates no faults in that class. Increasing numbers indicate
increasingly higher numbers of faults present in that class.
status pnc page 1 of 1
PORT NETWORK CONNECTIVITY
Duplicated? yes
Software Locked? no
Standby Busied? no
Direct Connect? no
Standby Refreshed? yes
Interchange Disabled? no
A-PNC B-PNC
Mode: active Mode: standby
State of Health: functional State of Health: functional
Inter PN Index: 00.00.00.00.00 Inter PN Index: 00.00.00.00.00
Inter SN Index: 00.00 Inter SN Index: 00.00
Major Alarms: 0 Major Alarms: 0
Minor Alarms: 0 Minor Alarms: 0
Warning Alarms: 0 Warning Alarms: 0
SN Locations: 01E SN Locations: 01D
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