Reference Manual

Self Test and Supervision
40.4.1 Supervision of Buses
Purpose
The purpose of this function is to check the integrity of the data on the
buses.
Preconditions and Initiation
The function is automatically initiated at the start of the functions
driving and receiving information on the buses.
Description
Receive and transmit bus supervision encompasses buses between three
or more RUs or major functional blocks. The address or data buses of
the processors are not supervised by this specific function. The
supervision of the buses is achieved by comparison of data sent to the
bus driving function with the information on the bus, and by control
information embedded in the data. The function looks for expected
traffic on the bus. Traffic must be generated in absence of normal
traffic. Disturbances are reported to fault handling for filtering and fault
detection.
40.4.2 Supervision of Cables
Purpose
To detect removal of a cable.
Preconditions and Initiation
Initiates automatically at start of application software.
Description
All cables between the RUs are supervised. Removal of a cable during
operation is always detected by one of the following conditions:
•
No current in the cable
•
Missing logical signal
• Missing traffic message
It is possible to disable and enable the fault reporting for the cables
listed below using the OMT.
• CDU TRU PFWD cables
• CDU TRU PREF cables
• FU CU PFWD cables
• FU CU PREF cables
When the OMT is disconnected, the fault reporting is always enabled.
EN/LZT 720 0008 R1A
2001-06-26
307 (421)
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