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ATM-WSP (ATM WAN Spare Processor)
Issue 1 June 2005 649
ATM-WSP (ATM WAN Spare Processor)
S8700 MC
S8700 Multi-Connect systems with multiple PNs 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 PNs.
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 PNs 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.
2. 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
3. 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 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 Name in
Alarm Log
Alarm
Level
Initial Command to Run Full Name of MO
ATM-WSP MAJ status atm wsp wsp# ATM WAN Spare Processor
ATM-WSP MIN status atm wsp wsp# ATM WAN Spare Processor
ATM-WSP WRN display atm wsp wsp# ATM WAN Spare Processor