The self-healing mechanism is performed automatically by the Fiber Linking
Card. Switching to the secondary ring will cause audio breaks or disturbances
and temporary loss of crosspoint data.
If a single fiber connection is lost on both rings the nodes adjacent to the
failures will loop-back their connections to the failed cables healing the rings. In
the state the fiber audio will therefore be routed utilizing both the primary and
secondary fiber rings.
Note: The Eclipse HX configuration software (EHX) will report any failures in the fiber
connection system.
7.4.1.2 Loss of a single node
If a node is lost on the ring the nodes adjacent to the failed node will loop-back
their connections to the failed node healing the ring using the working remains
of the ring. The configuration software (EHX) will report the failure.
This applies to the situation where the fiber card itself has failed rather than the
matrix.
7.4.1.3 Loss of two fiber connections
If two adjacent fiber connections are lost on the ring, this will be handled as for
the loss of a single node where the nodes adjacent to the failed node will loop-
back their connections to the failed node healing the ring.
The configuration software will report the failure correctly as two failed cables. If
two non-adjacent fiber connections are lost on the ring the nodes adjacent to the
failures will loop-back their connections to the failed cables healing the ring into
2 separate smaller rings. The configuration software will report the failure.
Note: In this instance the two sub-rings will be dependent on their Ethernet
connections for configuration and data transmission but there will be no audio
path between them.
7.4.1.4 Loss of two nodes
If two adjacent nodes are lost on the ring this will be handled as for the loss of a
single node where the nodes adjacent to the failed node will loop-back their
connections to the failed nodes healing the ring. The configuration software will
report the failure correctly as two failed nodes.
If two non-adjacent nodes are lost on the ring the nodes adjacent to the failures
will loop-back their connections to the failed nodes healing the ring into 2
separate smaller rings. The configuration software will report the failure.
7.4.2 Dual card set redundancy
The fiber linking function supports Dual card set redundancy. Both Card set A
and Card set B are fitted in each node of the ring. In this case each matrix
contains two Fiber-optic Linking card sets.
This approach affords full redundancy, offering protection against component
failure within a single Fiber-optic Linking Card Set.
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