A reasoning engine is disclosed. At least one embodiment of a method includes subscribing to events associated with a communication system and receiving a notification for an event, the event being associated with a communication between a first communications device and a second communications device. A pump laser is disposed out of the signal path in a manner that allows a pump signal from the pump laser to reflect off the WDM coupler and enter the signal path. Each of the low current interrupting fuse element portions includes a weak spot located proximate the second end of a respective one of the sleeves.