Initialization and Recovery
555-233-123
4-8 Issue 4 May 2002
Procedure for SPE-Down Mode
Due to fatal hardware and software problems, it is possible for a system to go into
SPE-Down Mode. In this mode, the system invokes emergency transfer and does
not provide any other service. Moreover, while in this mode, the software does not
(or cannot) run at all. In a high or critical reliability system the system goes into
SPE-Down mode only when both SPEs go into SPE-Down mode.
There is an interface to the system by maintenance. The Processor circuit pack, is
responsible for maintenance in a standard reliability system. In a high or critical
reliability system, the maintenance is provided by the A-carrier Duplication
Interface (DUPINT-A) TN772 circuit pack with help from the processor.
The administration terminal, which connects directly to the processor in a
standard reliability system and to DUPINT-A in a high or critical reliability system,
provides a very limited interface to the system. Technicians can display alarms or
restart the system. Only a subset of control complex alarms displays.
The following are sample displays for SPE-Down mode and the alarms displayed.
Display for SPE-Down in a Standard Reliability
system:
**************SPE DOWN MODE*************
You can display alarms and reset system(4).
SPE_DOWN->
Screen 4-1 and Screen 4-2 on page 4-9 show all possible SPE-Down alarms in a
standard reliability system and in a high or critical reliability system, respectively.
Screen 4-1. Display Alarms Command
* The “MAINT” designation is used for PR-MAINT.
DISPLAY ALARMS:
Physical Logical On Alternate Alarm Date Date
Name Name Board? Name Type Alarmed Resolved
------ PROC_BD y ----- MAJOR ------ ------
------ MEM_BD_0 y ----- MAJOR ------ ------
------ M_BUS y ----- MAJOR ------ ------
------ MAINT* y ----- MAJOR ------ ------
------ NETCON_BD y ----- MAJOR ------ ------
------ TAPE_UNIT ------ ----- MAJOR ------ ------
------ NO_TAPE ------ ----- MAJOR ------ ------
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