Take Over of Primary Role
The secondary device takes over the primary role
The serial connection to the primary device is lost.if
It acts as Link Active Scheduler on all configured H1 links.and
Its Ethernet port is operational.and
Restoring Redundancy
Only one of the listed faults may be present at a time. Another fault cannot be tolerated
until the redundant set has been repaired and a fully operational secondary device is
available.
The required measures for repairing the redundant set of devices depend on the present
fault. For an overview refer to Table B.1.
Table B.1: Measures for Repairing a Redundant Set of Devices
Measure of RepairFault
Replacement of the defective Linking
Device.
Permanent fault within the Linking Device
Restart of the Linking Device (performed
automatically).
Transient fault within the Linking Device
Re-establishment of the serial connection.Loss of the serial connection between the
two Linking Devices
Re-establishment of the Ethernet
connection.
Loss of the Ethernet connection between
the two Linking Devices
Re-establishment of the H1 connection.Loss of an H1 connection between the
primary device and the entire H1 link
B.6.3 Redundancy Behavior
Table B.2 provides detailed information on the redundancy behavior. This may be useful
to get a correct understanding of what fault conditions can be covered and how the
system recovers from such fault conditions.
2PAA114135-610 108
B Technical Reference
B.6 Redundancy
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