The existing Topology adapters for OTM are not be able to discover the full, end-to-end topology. Each adapter communicates with an EMS (like the TMF814 adapter) or the optical network elements directly (like the SNMP adapter) to gather topology. These adapters are only able to report topology for their own sub-network. The processing described in this section allows for the creation of end-to-end circuits that traverse multiple sub-networks.

Figure 1. Example of a circuit that spans multiple sub-networks

The terms Circuit and Trail are used generically within this section. These may actually be HighOrder_Circuit, LowOrder_Circuit, ClientCircuit, HighOrder_Trial, LowOrder_Trial, or ClientTrail depending on the context.