Restart and Recovery
21.2 Functions
21.2.1 Restart Origin
A restart can occur in any Main RU or in the entire RBS for any of the
following reasons:
• Power on
• Reset button
• Software fault
• Memory fault
• BSC ordered reset
21.2.2 Central Main RU Restart and Recovery
The sequence of actions initiated in a CMRU at restart and recovery is
summarised below:
• Select Application Software
− The application software is available even after power on
reset
− Further information is found within the context of
Function Change
• Conditional RBS Database Load
− A valid RBS database must be present for restart and
recovery to be completed
The RBS database is checked to ensure:
• The database exists
• The structure is correct
− If either of these criteria is not fulfilled the restart is
suspended pending the loading of a valid database via the
OMT
− A visual indicator, ’Fault Indicator’, located on the
backplane flashes to indicate when the RBS is waiting for
the RBS database to be loaded
• Internal Link Establishment
− The CMRU starts a continuous process which supervises
the internal link establishment and loss, between itself
and its Sub-RUs and the DMRUs.
− On link establishment, with a DMRU, the CMRU
compares the revision of DMRU application software in
the DMRU with its own copy of the DMRU software. If
the application software differs, the CMRU updates the
DMRU application software with its own copy.
140 (306)
EN/LZT 123 2697 R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
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