Restart And Recovery - Ericsson CME 20 R6.1 Reference Manual

21

Restart and Recovery

The "Restart and Recovery" function allows either a specific RU or the
entire RBS to be started and restarted in a controlled way.
Restart and/or Recovery may occur for a number of different reasons,
including, but not restricted to:
•
•
•
The overall objective of Restart and Recovery is to determine that a
restarting unit is capable of being put into operation and, if appropriate,
to prepare the unit for being put into operation.
If a restarting unit cannot be taken into operation, the Restart and
Recovery function identifies the reason using the visual indicators.
21.1 Concepts
Micro building system
CMRU
DMRU
Main RU
Sub-RU
Passive RU
RU
EN/LZT 123 2697 R5A
1998-08-13
Power on
BSC-ordered reset
Internal fault
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Products where all vital units are enclosed
in a sealed cabinet. The units are normally
not replaceable in the field, but the cabinet
will be replaced as a whole.
Central Main RU. Subclass of Main RU.
An RBS has only one CMRU.
Distributed Main RU. Subclass of Main
RU. A DMRU is subordinate to the
CMRU.
A Main RU:
- contains one or more processors to which
software can be downloaded from the BSC.
- is either central or distributed, see above.
- may, or may not, have a direct signalling
link to the BSC.
A sub-replaceable unit is always
connected to a superior Main RU. This
connection is used for retrieval of
equipment information. A Sub-RU
normally does not have a processor.
An RU with a very low level of
intelligence. It is independent of the
processor system and has no connection
for O&M communication.
The smallest unit that can be handled on
site or in a repair center. Information
about the RU can be retrieved via OMT or
BSC.
Restart and Recovery
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