Logical connections are represented by LogicalConnection objects with endpoints represented as CTP objects. The logical and physical connections are related using LayeredOver from CTP to PTP, and from LogicalConnection to TopologicalLink as shown in GUID-D3E75E17-07D7-4886-8E78-9825A10F6C55.html#GUID-D3E75E17-07D7-4886-8E78-9825A10F6C55___OTM_ELEMENTS_SONET_32465. Many LogicalConnection objects may be LayeredOver a single TopologicalLink in order to represent the low-speed circuits provisioned within a high-speed trunk.

The LogicalConnection class is used to represent the connection across each protection group when a SubnetworkConnections passes through more than one.