Return The Rsc-M To Service - Nortel DMS 100 Series Maintenance Manual

2-40 Maintenance overview
Enhanced Dynamic Data Sync (EDDS)
The EDDS is a necessary component of warm switch of activity (SWACT). A
Warm SWACT preserves processing of all calls. Warm SWACTs occur when
the active unit of an XPM drops activity. An XPM trap, REX test, or other
causes the active unit of an XPM to drop activity. An XPM drops activity to
preserve call and unit states to allow calls to continue without interruption.
For a successful warm SWACT, the inactive unit must be in service (INSV).
The inactive unit can be out of service (OOS), manually busy (ManB), system
busy (SysB), or C-side busy (CBsy). If the inactive unit was in any of these
states, the following events occur during a return to service (RTS):
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Return the RSC-M to service

An RSC-M is RTS if manual maintenance occurs or a system audit detects a
defective component.
When manual maintenance occurs, a fault can cause the RSC-M unit or the PM
to become SysB. If this condition is present, the unit is normally busied and
tested. When the defective component is located, repaired, or replaced an RTS
occurs on the unit or PM.
If a system audit detects a defective component, an audit attempts to return the
component to service.
Performing an RTS without running diagnostics
When the system uses the FORCE parameter with the RTS command, read
only memory (ROM) diagnostics are not performed.
297-8223-550 Standard 04.02 November 2000
the system initializes the inactive unit
The OOS tests run on the inactive unit
if the inactive unit static data check sum is not correct, the CM sends new
static data. The CM also marks the inactive unit in-service trouble (ISTb).
the active unit sends dynamic data to the inactive unit (bulk sync).
the CM marks the inactive unit INSV
CAUTION
Use the FORCE parameter if directed to
Operating company personnel must not use the FORCE
parameter unless directed to use this parameter.
Diagnostics that are normally part of the RTS command
can find an additional fault.