Reference Manual

Table Of Contents
Function Change
36 Function Change
The purpose of "Function Change" is to facilitate the reload, change or
upgrade of the RBS software and the subsequent activation of that
software. The software is downloaded from the BSC to the RBS via the
A-bis interface.
Function change incorporates the following features:
Rapid initial start
Software preloaded in the non-volatile memory of the
RBS during manufacture; permits rapid initial start.
Rapid restart
At restart of an RBS following a power failure, the
software does not have to be downloaded via the A-bis
interface to the RBS. This is because of the non-volatile
memory of the RBS.
Minimised software download time
Software is distributed internally within the RBS. Only
one copy of the software is downloaded to each RBS,
minimising the time required for software download.
Software download while in trafc
The RBS can perform download of software without
affecting normal operation. Trafc is affected only when
switching over to the downloaded software.
36.1 Concepts
File Package A set of individual software les which
together constitute a revision of the
software required by an entire RBS or by
parts of the RBS.
File Revision The le revision identies a specic
software le. This includes the type of
Main RU the software is intended for
execution on as well as the software
revision.
Software le The software necessary for a class of Main
RU and its loadable Sub-RUs. A software
le contains application software.
CMRU Central Main Replaceble Unit. An RBS
has exactly one CMRU. In the RBS 2000
Macro hardware architecture, the DXU is
the CMRU. In the RBS 2000 Micro
hardware architecture, the DXB is the
CMRU.
EN/LZT 720 0008 R1A
2001-06-26
273 (421)
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