Avaya Definity SI, Maintenance Manual, Page: 2186 / 2968

Maintenance Object Repair Procedures
555-233-123 10-1400 Issue 4 May 2002
PR-MEM (TN2404/TN790 RISC
Memory)
The TN2404/TN790 RISC Memory contains the DEFINITY software and
firmware. The Processor circuit pack is the most critical component in the system.
For testing purposes, the circuit pack is logically separated into PR-MAINT,
PROCR, and PR-MEM. This means that a memory problem requires that the
Processor be replaced. These systems contain two types of memory: Flash ROM
and DRAM. Flash ROM is memory that contains the boot image, part of the
low-level maintenance firmware, PI firmware, and PACCON firmware. This type of
memory is not erased during circuit pack resets. It can be reprogrammed via the
upgrade software command or a Reset System 4/5 using a software memory
card.
One section of the Flash ROM (BOOTPROM) containing the system initialization
functions and the low-level diagnostic programs is programmed at the factory and
is not reprogrammed by the upgrade software command. DRAM is used for
software data storage, and it changes constantly. Both types of memory are
present on the Processor circuit pack. The diagnostics run appropriate tests on
both memories.
DRAM is replaceable and installed in 3 Single In-line Memory Module (SIMM)
sockets on this circuit pack. Replacement of these SIMMs is described in “Install
the SIMM on the TN2404/TN790 Processor Circuit Pack” in
Chapter 5, ‘‘Routine
Maintenance Procedures’’ .
For all system activity, the Processor must be able to access the Memory. If the
Processor cannot do this, the system goes into SPE-down mode. In SPE-down
mode, fatal Memory errors may show up as Processor errors. This merely
indicates that the Processor and the Memory are very closely linked as a matter of
course.
If the initialization diagnostics fail, refer to the “Procedure for SPE-Down Mode”
section in
Chapter 4, ‘‘Initialization and Recovery’’ .
MO Name (in
Alarm Log)
Alarm
Level Initial Command to Run Full Name of MO
PR-MEM
1
1 The MO is “PR-MEM” because all of the Memory used by the Processor is on the
TN2404/TN790 Processor circuit pack.
MAJOR test memory a/b lo c TN2404/TN790 RISC
Memory
PR-MEM
1
MINOR test memory a/b sh c TN2404/TN790 RISC
Memory