Operation And Maintenance Support - Ericsson CME 20 R6.1 Reference Manual

24

Operation and Maintenance Support

The "Operation and Maintenance Support" functions are as follows:
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24.1 Concepts
CMRU
DMRU
TDMRU
Main RU
Micro building system
MO
EN/LZT 123 2697 R5A
1998-08-13
Local/Remote Mode
−
This function allows an RU to be switched between local
and remote mode.
Remote Operational Indication
−
Provides an indication on site that the BSC has put an
RU into operation.
Loop Control
−
Provides support for the BSC to perform a loop test of
the connection between the BSC and the RBS.
Calendar Time
−
Maintains a regularly updated general-purpose
time-of-day clock within the RBS.
RSSI (Received Signal Strength Indicator) temperature
compensation
−
Provides the possibility to compensate for temperature
dependencies in the receiver path.
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Operation and Maintenance Support
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.
Transceiver DMRU.
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.
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.
The BSC manages the O&M of the RBS
via the A-bis O&M Interface. The RBS
equipment is seen as MOs by the BSC.
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