Clear-Com HX System Frames - Manual (Page 88)

Loss of single fiber connection
If a single fiber connection is lost on one ring and the other ring is intact then the active ring
always attempts to heal itself by reversing the direction of data flow to bypass the failed
connection. If the extent of the failure is such that the active ring is unable to heal itself then
the system will switch to the secondary ring.
The self healing mechanism is performed automatically by the Fiber Linking Card whereas
the switch-over between redundant cards and rings requires software or operator
intervention.
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 and the most intact ring will be
used.
Note:
The Eclipse HX configuration software (EHX) will report any failures in the fiber connection
system.
Loss of a single n ode
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.
Lo ss of two fiber c onnections
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.
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.
88 Eclipse HX-Delta User Guide