Avaya S8700 Maintenance Manual page 1969

PKT-INT (Packet Interface)
Packet Interface Circuit Replacement
When replacing a Packet Interface circuit as part of a TN2312AP IPSI circuit pack,
follow the procedure used for replacing an IPSI circuit pack.
Demand Reset of a Packet Interface Board
A demand reset of an active IPSI's Packet Interface via the entry of a reset
packet-interface command is denied by system software if the Packet Interface
is in service (has not been placed in an out-of-service state by background
maintenance software). Otherwise, a reset of an in-service Packet Interface
circuit would cause severe service disruption including the loss of all existing calls
and dropped links to adjuncts such as AUDIX. As part of the automatic recovery
action initiated when a fatal hardware-fault condition is detected, the software that
controls Packet Interface maintenance puts a Packet Interface circuit in the
out-of-service state if that circuit pack has been reset three times within the last 15
minutes.
A demand reset of a standby Packet Interface circuit is not disruptive and is
allowed regardless of the service state of the associated maintenance software.
Service States
Packet Interface maintenance software maintains a state variable to monitor the
in-service/out-of-service state of each Packet Interface circuit. In a
duplex-reliability system (unduplicated IPSIs), if maintenance software detects
that a Packet Interface has a "fatal fault", it automatically attempts to reset the
circuit pack as quickly as possible. An extensive set of diagnostic tests is run
when the circuit pack is reset.
If the circuit pack's diagnostic tests do not pass in a duplex-reliability system
(unduplicated IPSIs), the failing Packet Interface is placed in an out-of-service
state. In turn, every link handled by that IPSI goes out of service. This is a
disruptive action since established calls associated with telephones connected to
PNs are dropped as a result of the PNs being taken out of service.
If the standby IPSI (in a high- or critical-reliability system – with duplicated IPSIs)
has an acceptable state of health, maintenance software interchanges the IPSIs –
instead of resetting the active IPSI's Packet Interface circuit. This is less
disruptive than a reset.
An IPSI's Packet Interface also goes out-of-service if the IPSI has either:
Reported a fatal fault at system initialization time
Been reset by background maintenance 3 times in the last 15 minutes,
whether or not reset succeeded.
The state of a Packet Interface circuit can be determined by using the status
packet-interface command.
555-233-143 Issue 1 May 2002 8-1247