Fault Conditions; Rsc-M - Nortel DMS 100 Series Maintenance Manual

2-48 Maintenance overview
If the original active unit is INSV less than 3 min, the unit returns to service
without OOS diagnostics. The reason is that a previous SWACT occurred. If
the SWACT occurred in less than 3 min, the active unit must have had OOS
diagnostics run. If the original unit is active more than 3 min, the active unit
returns to service with OOS diagnostics.
The active unit attempts to regain activity. This condition occurs for all types
of RTSs. If the active unit cannot regain activity, both units are set SysB and
all the XPM are set SysB.
ROM/RAM query
/Clear data
Initializing
/Static Data
Loading:Execs
Initializing

Fault conditions

The next section describes automatic maintenance that detects fault
conditions. The section describes fault conditions for the RSC-M according to
the configurations.

RSC-M

Fault conditions for the RSC-M include errors that are specified and errors that
not specified to processor cards.
The following errors can occur in the RSC-M processor cards:
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•
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Parity faults
A parity fault indicates a memory accuracy fault. If the executing code
encounters a fault, the CPM is insane, and must drop activity immediately and
go out-of-service. The parity error can initiate an interrupt instead of a bus
error. When this event occurs, the parity audit identifies memory faults before
code execution hits these faults. The CC handles parity faults when possible
in order for an RTS to occur quickly.
The following are the three types of parity faults:
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•
297-8223-550 Standard 04.02 November 2000
parity faults
traps
software errors
Intermittent occurs when the RSC-M detects a fault, but does not find an
error when the RSC-M reads the location again.
Soft occurs when the RSC-M detects a parity error and finds an error when
the RSC-M reads the location again. An error is not found when the