Operation and Maintenance Support
24 Operation and Maintenance Support
The "Operation and Maintenance Support" functions are as follows:
• 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.
24.1 Concepts
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.
TDMRU Transceiver DMRU.
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.
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.
MO 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.
EN/LZT 123 2697 R5A
1998-08-13
153 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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