An apparatus and methods for identifying a defect andor an operating characteristic of a system being monitored are described. A connector terminal is located within the inner housing. The bearing allows pivoting of the inner component with respect to the bearing. Because of the distributed storage of next hop bindings, the number of hosts that can be served by a single packet forwarding device is increased over packet forwarding devices where each packet processor stores a complete set of next hop bindings for all connected hosts. Therefore, a thickness of the backlight unit may be reduced. The low permeation barrier layer tapers with the outer polymeric layer at the pinchoff region to first and second barrier ends separated at the pinchoff end to determine a pinchoff gap.