A substrate verification system is utilized for verifying substrate location and orientation in a catalytic converter mat wrapping mechanism. An access port is provided in a turbine engine case in an area adjacent to the dirt separator. Information is encoded in markings on a base medium by depositing or intertexturing on the base medium a material where the surface dimensions, thickness and presence of the material contain the encoded information. Selection of the one or more parts may be made and results in the generation of a display of a further one or more parts for selection. The plug includes a pair of first and second signal contacts, and the length of a first signal transmitting path from the first signal contact to the cable via the junction substrate is substantially equal to the length of a second signal transmitting path from the second signal contact to the cable via the junction substrate.