ATM PNC-DUP (ATM PNC Duplication)
Issue 1 May 2002
8-245555-233-143
Steady State LEDs
The LEDs of PNC components in a stable duplicated system should appear as
follows:
■ For an active ATM EI (functioning as Archangel) in an EPN without IPSIs,
its amber LED’s flash pattern is 2 seconds on/200 ms off.
■ For a standby ATM EI in an EPN without IPSIs, it’s amber LED is off.
■ For an active ATM EI in an EPN with IPSIs, its amber LED is on steady.
■ For an standby ATM EI in an EPN with IPSIs, its amber LED is off.
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
that occur in a PNC’s components are reported to PNC-DUP and incorporated in
the affected PNC’s state of health. The SOHs of both PNCs are displayed on the
status pnc form, as shown in Figure 8-9.
Figure 8-9. Status PNC form with standby PNC fully In-Service
status pnc page 1 of 1
PORT-NETWORK CONNECTIVITY
Duplicated? yes
Software Locked? no
Standby Busied? 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 Inter PN Index: 00.00.00.00
Major Alarms: 0 Major Alarms: 0
Minor Alarms: 0 Minor Alarms: 0
Warning Alarms: 0 Warning Alarms: 0
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