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ATM PNC-DUP (ATM PNC Duplication)
Issue 1 June 2005 591
PNC State-of-Health Indexes
The Inter-PN Index screen the state-of-health vector is used to track and compare the states of
health of both PNCs. The fields making up the indexes are 2-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 present for that class. Increasing numbers indicate increasingly higher
numbers of faults present in that class.
The Inter-PN Index contains four fields (XX.XX.XX.XX). The Inter-PN Index reports faults in
connectivity between PNs.
● The meaning of each fault class field is given in Table 192: PNC State-of-Health Fault
Classes on page 591.
● A zero entry indicates that there are no faults reported.
● Higher numbers indicate increasing number of faults.
● All zeros indicate a perfect state of health.
● Unless the PNCs are locked, the active PNC’s state of health should always be equal to or
better than the standby’s. Otherwise, the system performs a spontaneous interchange.
After a PNC-related alarm is cleared, the system performs a partial refresh of the standby PNC.
The corresponding fault class field is not updated to reflect the improved state of health until the
refresh is done. The state-of-health indexes do not agree with the current alarm status during
this period.
Table 192: PNC State-of-Health Fault Classes
Fault
Class
Priority Description MOs
FC_EAL 1 Number of PNs with EALs down EXP-PN
FC_PACL 2 Number of PNs with LINL, RINL, or EI-SNI neighbor link
faults
EXP-PN
FC_BFD 3 Number of PNs with BFDL (Bearer Fault Detection Link)
faults
SYS-LINK
FC_HW 4 Number of PNs affected by hardware faults in a link having
an EI as an endpoint. Use list atm pnc to see endpoint
designations.
ATM-EI