Clear-Com HX System Frames - Manual (Page 93)

The configuration software will report the failure correctly as two failed cables. If two non-
adjacent fiber connections are lost on one ring and the other ring has a similar fault 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.
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.
Switching to the secondary ring will cause some minor degradation in audio, but this is not
usually detectable unless a scope is used. The self healing mechanism and the switchover
between redundant cards and rings is performed automatically by the matrix frame.
If two adjacent nodes are lost on one ring and the other ring has a similar fault 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 one ring and the other ring has a similar fault 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.
Fiber-Optic linking card failure
Fiber-optic linking card failure is handled in the same way as the loss of a single node (see
above). The configuration software will report the failure.
7.4.3 Fault tolerance
Dual card set redundant system: full redundancy
In the event of single or multiple cable fault or loss of node conditions occurring on one ring
whilst the other ring remains intact the active ring always attempts to heal itself.
Switching to the secondary ring will cause audio breaks or disturbances and temporary loss
of crosspoint data. The self healing mechanism is performed autonomously by the fiber
linking card whereas the switch-over between redundant cards and rings requires software
or operator intervention.
In all fault cases involving recoverable cable faults or loss of nodes on one or both rings the
remaining nodes may experience audio breaks or disturbances and temporary loss of
crosspoint information or data.
Audio and data from a failed node will not be available to the remaining nodes for the
duration of the failure. When a ring with non-adjacent failures sub-divides into two sub-rings,
audio and data from the failed nodes will not be available to the nodes in either sub-ring.
Audio and data will continue to be available to nodes within the same sub-ring but data may
still be available to all nodes that are still functioning if there is an intact, independent
Ethernet connection to those nodes.
93 Eclipse HX-Median User Guide