Self Test and Supervision
26.3.4
Software Execution
If a malfunction of the executing software occurs, this is detected.
26.3.5
Radio Transmission and Reception
If an error occurs in the signal strength or in the bit error rate in the
transmitter or in the receiver of the transceiver, this is detected. All
transceivers are covered.
26.3.6
Layer 2 Data Link Transmission
If a malfunction occurs in the layer 2 data link transmission, this is
detected. The supervision covers external links and internal links, that
is, the signalling multiplexing between the CMRU and the end-points of
the DMRUs.
26.3.7
LAPD Concentration
If the transmit queue in the LAPD concentrator becomes full, this is
detected.
26.3.8
Environmental Conditions
If the temperature rises above a level where destruction may occur, this
is detected. Local actions are further described in chapter Diagnostics
and Fault Handling.
If the temperature within the RBS is outside the normal conditions
range or outside the safe function range, this is detected.
26.3.9
Power Conditions
If there is a fault in any of the units used for energy control, this is
detected.
Incorrect power levels for AC power or DC power are detected. AC
mains failure is detected.
26.3.10
Synchronization Sources
If the frequency generators of the transmitter or receiver are not locked
to the reference frequency, this is detected.
If the quality of the reference source is too low, this is detected.
164 (306)
EN/LZT 123 2697
R5A
1998-08-13
© Ericsson Radio Systems AB
— All Rights Reserved —
