An exhaust system of a marine propulsion device is provided with a bifurcated cooling passage in its elbow structure in order to limit the effect of cold water being disposed in thermal communication with exhaust gas passing through the elbow structure. The billing system and communication assistance system include a telephone switch for receiving calls from a plurality of requesters desiring access to the information corresponding to subscribers. The frame is mechanically coupled to the PCB and has a main body portion with a plurality of holes therein. The matching elements and alignment elements are engaged with each other for alignment, such that the optoelectronic element, the substrate and the optical coupling element are directly aligned during assembly.