Abstract: An active patch panel assembly splits an optical signal of a fiber optic cable into two signals: a first signal directed to a patch panel port and a second signal measured by an optical sensor unit. A network management service of a computing services resource provider receives signal information from the optical sensor unit regarding the optical signal. The network management server may compare the signal information with signal information received from another patch panel assembly. Based on a correspondence between the signal information of the different patch panels, the network management service may determine a data path association between the optical signals. The data path association may be recorded in a database that stores data path associations of a service provider.