Operational Conditions - Ericsson CME 20 R6.1 Reference Manual

As an alternative to the above, unconditional download is also
supported. In this case, there are no conditions on File Revision etc. for
the download.
22.2.3 Software File Download
The CMRU accepts the download of software files intended for all
Main RUs in the RBS.
A DMRU never accepts direct download of software files via A-bis,
since this must be done via the CMRU.
This arrangement means that only the files actually needed by each Main
RU are downloaded. Each individual file is downloaded only once, thus
minimising the software download time required. Note that this is an
improvement compared to the general A-bis concept; downloading a
software file several times, once for each Main RU needing it.
Loading software to a Main RU is allowed in any state, even while
operational.
The transfer of a software file is initiated and performed via the A-bis
interface. The CMRU stores the transferred software file in non-volatile
memory.
22.2.4 Start Required
On completion of the internal distribution of software files, the RBS
informs the BSC that the new software can be activated.
22.2.5 Software Start
The activation of new software is ordered via the A-bis interface. When
the order is received, the software is copied from non-volatile memory
into volatile memory, where it is executed.
At switch-over to the new software, traffic is affected. This implies a
restart as in the section Restart and Recovery followed by configuration
and enabling as specified in the section Functionality Administration.
22.3

Operational Conditions

22.3.1 Operation and Maintenance
The visual indicators relevant to Function Change are described in the
section Operation and Maintenance Terminal.
22.3.2 Capabilities
The download of software via the A-bis to the RBS and internal transfer
of software files does not affect the normal operation of the RBS.
Switch-over, i.e. software start of an RBS, takes less than 60 seconds.
The switch-over time is defined as the time elapsed from the reception
of a start command via A-bis to when the Main RU is ready for
re-establishment of the link to the BSC.
EN/LZT 123 2697 R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
Function Change
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