Restart and Recovery
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:
• Power on
• BSC-ordered reset
• Internal fault
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 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.
CMRU Central Main RU. Subclass of Main RU.
An RBS has only one CMRU.
DMRU Distributed Main RU. Subclass of Main
RU. A DMRU is subordinate to the
CMRU.
Main RU 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.
Sub-RU 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.
Passive RU An RU with a very low level of
intelligence. It is independent of the
processor system and has no connection
for O&M communication.
RU 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.
EN/LZT 123 2697 R5A
1998-08-13
139 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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