Duplication Concepts
Issue 4 May 2002
6-13 555-233-123
■ SPE Select Switches
An SPE-interchange can be initiated by moving both SPE Select Switches,
one at a time, to the position that selects the Standby SPE for Active
Mode. The SPE Select Switches were described earlier in this chapter.
■ Scheduled Maintenance
An SPE-interchange can be requested as a part of scheduled
maintenance. This mechanism is used to exercise both SPEs. An
SPE-interchange can be requested as part of scheduled maintenance by
issuing the change system-parameters maintenance command and
updating the form.
■ Processor Insanity
Duplication Interface A (DUPINT, TN772) periodically audits the sanity of
each of the Processor circuit packs. If the Active SPE does not respond to
the sanity audit, Duplication Interface A initiates an SPE-interchange.
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