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

28

Operation and Maintenance Terminal

The OMT is a tool that provides efficient aid for installation, site
acceptance, diagnostics and maintenance of RBSs within the RBS 2000
series.
28.1 References
/G.703/
/G.704/
/GSM:11.20/
/GSM:05.05/
28.2 Concepts
CMRU
DMRU
Installation Database
Main RU
Managed Object
EN/LZT 123 2697 R5A
1998-08-13
Operation and Maintenance Terminal
CCITT Recommendation G.703, White
Book
CCITT Recommendation G.704, White
Book
GSM 11.20 (phase 1)
GSM 05.05 (phase 2)
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.
Each RBS has a built-in database where
information about installed hardware is
stored. The information reflects the
configuration as well as the history of the
hardware. Within the RBS, each RU
carries a database. The installation
database is used by the operator (via the
OMT), by RBS internal functions and
partly by the BSC (via A-bis).
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.
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.
This is a means of describing the RBS in
a function-oriented way, and a logical
model of the RBS, in terms of MOs, is
built in the BSC. All O&M actions are
based on this logical model structure
created in the BSC.
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