Operation and Maintenance Support
The BSC reports the operational status of each MO via the A-bis
interface. The RBS uses this information to determine when a specific
RU should be considered operational.
24.2.3 Loop Control
The loop control function allows the BSC to request the RBS to loop
the speech data link associated with a TS back to the BSC. This allows
the BSC to test the speech data link associated with each TS.
24.2.4 Calendar Time
Each RU maintains a general-purpose time-of-day clock for use by
other functions, e.g. time-stamping entries in a log. The clock is
initially set and periodically updated by the CMRU requesting the
current time from the BSC.
The calendar time is requested from the BSC after each layer 2 link is
established. This request is subsequently repeated every 24 hours while
the layer 2 link remains established. The calendar time is then
distributed internally to the RUs within the RBS.
24.2.5 RSSI Temperature Compensation
The loss in the receiver path varies with temperature. To obtain a more
accurate estimate of the loss, the temperature of the receiver is
measured continuously and a temperature-dependent part is used to
update the RSSI compensation value.
24.2.6 Visual Indications
Products belonging to a Micro building system are equipped with a
panel of visual indicators common for the whole cabinet.
Fault (red)
Off No fault(s) is detected.
On One or more fault(s) are detected in the
RBS.
At restart: Explicit test of indicators
There is one Fault indicator per cabinet.
Operational (green)
Off The RU is not operational or change of
RU mode is in progress
On When in local mode: There is no fault that
affects (or may affect) the function of the
RU
When in remote mode: Connected to BSC
and considered operational by the BSC
At restart: Explicit test of indicators
Flashing Either:
EN/LZT 123 2697 R5A
1998-08-13
155 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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