Avaya S8700 Series, Maintenance Manual

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Maintenance-Object Repair Procedures
555-233-143 8-302 Issue 1 May 2002
ATM-WSP (ATM WAN Spare
Processor)
S8700 Multi-Connect systems with multiple EPNs connected via ATM PNC have
the option of installing up to 15
ATM WAN Spare Processor (
WSP) units. Each WSP
has the ability to function as the S8700 Multi-Connect server, if the main server is
not functional or is not connected to one or more of the other EPNs.
ATM WSP is available in S8700 Multi-Connect standard loads. A WSP is capable
of running an entire S8700 Multi-Connect system (just as the main server can), or
whatever EPNs with which it can establish links while the ATM network is
impaired. WSPs continually monitor a path to the main server to determine
whether it is on-line. In the event of a main server failure, an automatic
switch-over to WSP control is neither instantaneous nor call-preserving. Likewise,
restoring the system to normal operation (under control of the main server)
requires manual intervention, and is neither instantaneous nor call preserving.
Each WSP attempts to establish connections (links) to every other WSP and to
the main server. These links are re-established once a minute. If a link cannot be
re-established, its status is flagged as “down.”
A WSP or main server is considered “down” if:
1. For standard reliability, links cannot be established on the A-PNC.
1. For a duplex- or high-reliability system and for standard reliability on the
other WSPs, links cannot be established:
— to both A-PNCs of the main server
— on the A-PNC between other WSPs
2. For a critical-reliability system, links cannot be established on both the
A- and B-PNCs.
A WSP becomes active (initiates a fail-over) when every link to a higher-priority
WSP and the main server has been in a “down” state for an administered amount
of time (as specified in the WSP Activation Timer field of the System-Parameters
Maintenance screen).
When a WSP becomes active, a major alarm is raised against this MO
(ATM-WSP). If it is later determined that the WSP should not be active, or the
system is rebooted at a COLD-2 or more severe level, the WSP is returned to a
standby state and the alarm retired. This alarm is never activated for the main
server.
MO’s Name
(in Alarm
Log)
Alarm Level
Initial Command to
Run
Full Name of MO
ATM-WSP MAJOR status atm wsp ATM WAN Spare Processor
ATM-WSP MINOR status atm wsp ATM WAN Spare Processor
ATM-WSP WARNING display atm wsp (1-15) ATM WAN Spare Processor