Internet2 Ciena Infrastructure - This map of the Ciena network depicts the data-plane interfaces installed in each node and the backbone topology. The number associated with each backbone interface is the 'OSRP Link Identifier' which is only synonymous with the physical Access Identifier (AID) where adjacent nodes are connected by a single OC192 line. Multiple parallel backbone circuits connecting adjacent nodes are bundled together into a single OSRP link wherein the bundled lines are treated as a single entity by OSRP. Unused OC192 interfaces are not shown but all Ethernet Line Modules, whether providing service or not, are included. Only connectors to the DCN service are shown; all of the connections concerned with other customers' production IP backhauls and internal connectivity to Internet2-owned routers and switches are omitted to improve clarity.