DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-840EXP-PN (Expansion Port Network)
9
EXP-PN (Expansion Port Network)
The EXP-PN maintenance object is responsible for overall maintenance of an
Expansion Port Network (EPN). The focus of EPN maintenance is on the
Expansion Interface or on the ATM Expansion Interface circuit pack that is acting
as the Expansion Archangel in an EPN. EXP-INTF or ATM-EI covers maintenance
of the Expansion Interface or ATM Expansion Interface circuit pack, while
EXP-PN covers a much broader area of activities and problems on an EPN. The
alarming strategy for EXP-PN is fairly simple and does not make use of any failure
analysis routine for spawning maintenance actions. EXP-PN alarming is based on
the availability of an EPN for service and the EPN’s response to various recovery
actions.
When investigating alarms logged against an EPN, problems involving the
Expansion Interface, an ATM Expansion Interface circuit pack acting as the
Expansion Archangel, and problems that may involve loss of communication
between the EPN and the SPE should be investigated. This could ultimately
include fiber links (FIBER-LK), DS1 CONV circuit packs (DS1 CONV-BD), Switch
Node Interface circuit packs (SNI-BD) and Switch Node Configurations
(SN-CONF) for CSS. For ATM, this could include the PPN ATM Expansion
Interface (ATM-EI) circuit pack, the ATM switch (ATM-NTWK), and EPN ATM
Expansion Interface (ATM-EI) circuit pack.
EPN Restarts
While not an exhaustive discussion of EPN recovery actions, this section
describes at a high level the causes and effects of EPN restarts so that these
Error Log events can be understood.
EPN Warm Restarts
EPN Warm Restart (EPN Reset Level 1) is generally performed on an EPN when
the recovery of that EPN can be accomplished in less than 30 seconds. When
possible, Warm Restart minimizes the work required to reinitialize an EPN, and
reduces the impact of an EPN failure by avoiding the longer and highly
destructive EPN Cold Restart. The primary cause of EPN restarts is failure of the
link from the SPE to the EPN due to a hardware fault in the link’s path. For most
hardware failures, this link, and thus the EPN, cannot be recovered until the failed
hardware is replaced. However, several failures modes exist for which hardware
redundancy allows the link to be recovered quickly. For instance, in a duplex SPE
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run
1
1. Investigate errors against EXP-PN and EXP-INTF.
Full Name of MO
EXP-PN MAJOR display errors
1
Expansion Port Network
