Avaya Definity SI, Maintenance Manual, Page: 2304 / 2968

Maintenance Object Repair Procedures
555-233-123 10-1518 Issue 4 May 2002
In certain circumstances, the Standby SPE is put into Maintenance Mode by the
Active SPE. In this mode, the SW-CTL and PKT-CTRL on the Standby SPE are
still isolated from the TDM Bus and Packet Bus, memory shadowing is disabled,
and its processor is no longer held in a reset state. Data Channels on the standby
SPE Network Control circuit pack can access the TDM bus, and the maintenance
testing can be executed in this maintenance mode. The 12 volt power supply on
the standby SPE Network Control circuit pack can also be turned on for Memory
Card maintenance testing. In Maintenance Mode, the Standby SPE accepts
maintenance activity requests from the Active SPE to perform testing on Standby
SPE components. For many of the requested activities, maintenance software on
the Standby SPE is restarted in order to conduct the activity. Translation saves
and announcement saves may be performed on the Standby SPE when it is in
Maintenance Mode. While in Maintenance Mode, the Standby SPE is not as
readily available to assume the role of the Active SPE, but it may do so depending
upon the severity of the Active SPE fault(s).
Whenever the Standby SPE is returned to Standby Mode from Maintenance
Mode, its DRAM Memory is refreshed. This means that the Active SPE DRAM
Memory is shadowed over to Standby SPE DRAM Memory. The flash ROM
memory in the Standby SPE is not refreshed, and the shadowing circuit cannot
write data into the flash ROM memory. The refresh is necessary because, while in
Maintenance Mode, memory shadowing to the Standby SPE is disabled and
Standby SPE Memory is not updated to reflect changes in Active SPE Memory.
After the refresh, Standby SPE Memory once again is an up-to-date reflection of
Active SPE Memory.
The Standby SPE goes into Down Mode whenever certain error conditions are
detected. These error conditions are described in detail in the “Hardware Error
Log Entries and Test to Clear Values” section. Once the error condition(s) that
cause(s) the Standby SPE to go into Down Mode are corrected, the Standby SPE
is first put into Maintenance Mode to conduct testing on Standby SPE
components. It is then returned to Standby Mode.
The current mode of the Standby SPE can be determined by issuing the status
system command.