Maintenance Description
9-64 Issue 8.0 July 2002
Figure 9-21. Dual Ring Interworking Circuit (Secondary Node Failure)
When an incoming OC-48 loss of signal condition is detected by the primary node
(node 4) and node 2, the primary node (node 4) and node 2 perform 2-fiber ring
protection switching. The 2-fiber ring protection switch does not affect the DRI
circuit.
For more information about the DRI application, refer to Volume I, Section 3,
"Applications." For more information about cross-connections, refer to Volume I,
Section 8, "Administration and Provisioning."
Primary Secondary
Low Speed
Interface
Node 4 Node 3
Other
Ring
Node
Other
Ring
Node
FT-2000
Line-Switched
Ring
Node 5
Node 1
Node 2
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