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Page 108 15/09/2004 PS8149KENAA01
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This document is the property of EADS and may not be copied or circulated without authorisation.
4.4.2 LOGICAL SECURITY BLOCKS
Automatic system maintenance sees the configuration as a set of hierarchically arranged
logical security blocks (LSB). When there is a malfunction this arrangement enables the
system to identify the faulty element and take the appropriate action: when an error is
detected, automatic maintenance can take fail safe action. This involves changing the
status of the security block that covers the defective hardware element.
Example: ******LA8 :0, 0, .. ** EN FAUTE **
The fail-safe action report is recorded in the logbook and contains the following
information:
♦ the type of security block that changed status
♦ the security block number
♦ new security block status
4.4.2.1 LIST OF SECURITY BLOCK STATUSES
The security block statuses have the following meaning:
NOT EQUIP. The LSB is not defined in the associated configuration table.
OUT OF SRV The LSB is inaccessible by the software and cannot take part in
network operations. This occurs, for example, when the LSB one step
up in the hierarchy is faulty.
This status is also the initial status of all LSBs before startup.
DOWNLOAD The processor associated with the LSB is being downloaded.
IN SERVICE The LSB is working.
FAULTY One of the LSB functions is defective. The LSB is removed from
normal operation by automatic maintenance.
DISABLED The maintenance operator has withdrawn the LSB from normal
operation using an operator command.
Other special statuses:
PARKED The telephone subscriber has not gone on-hook (permanent off-hook
condition).
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