Lucent Technologies Release 7 EXP-PN (Expansion Port Network)

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)

EXP-PN (Expansion Port Network)

The EXP-PN m ainte nanc e obj ect i s resp onsib le fo r over all ma inten ance of an

Expansion Port Network (EPN). The focus of EPN maintenance is on the

Expansion Interface or on the ATM Expansion Interface circ uit pack that is acting

as the Expan sion A rcha ngel in an EPN . EXP-INTF o r ATM-EI c overs maint enanc e

of the Expansion Interface or ATM Expansion Interface circ uit pack, while

EXP-PN covers a much broader area of activities and p roblems on an EPN. The

alarming strategy for EXP-PN is fairly simple and d oes not make use of any failure

analy sis rou tine f or spa wning main tenanc e ac tions . EXP-PN ala rming is b ased on

the availability of an EPN for service and the EPN’s response to various recovery

actions.

When investigating alarms logg ed against an EPN, problems involving the

Expansion Interface, an ATM Expansion Interface circ uit pack acting as the

Expansion Archangel, and p roblems that may involve loss of c ommunication

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 circ uit packs (SNI-BD) and Switch Node Confi gurations

(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.

While not an exhaustive discussion of EPN recovery actions , this section

describes at a hig h level the causes and effects of EPN restarts so that these

Error Log events can be understood .

EPN Warm Restart (EPN Reset Level 1) is generally performed on an EPN when

the recovery of that EPN can be acc omplished in less than 30 seco nds. When

possible, Warm Restart minimizes the work required to reinitialize an EPN, and

reduces the impac t 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 f rom th e SPE to th e EPN du e to a h ardwa re fau lt in t he lin k’s p ath. Fo r most

hardware failures, this link, and thus the EPN, cannot be rec overed until the failed

hardware is replaced. How ever, several failures modes exist for which hard ware

redu ndanc y all ows th e link to be reco vered qui ckly. Fo r inst ance , in a d upl ex SPE

MO Name (in

Alarm Log) Alarm

Level Initial Command to Run1

1. Invest igate error s agai nst EXP-PN a n d EXP-IN TF.

Full Name of MO

EXP-PN MAJOR display errors1Expansion Port Network