A method and mechanism to detect failure of an S102 link between an Evolved Packet Core, EPC, network based Mobility Management Entity, MME, and an Interworking System, IWS, in a Mobile Switching Center, MSC, pool deploying Circuit Switched Fallback, CSFB, for the EPC network. The circumferential end zones of the bearing half supported on the housing half having a high thermal expansion coefficient have a thickness which is greater than that of the circumferential end zones of the bearing half supported on the housing half having a low thermal expansion coefficient. The manufacturing execution system tracks overall processing of semiconductor wafers and the real time dispatch system provides near real time information regarding processing of semiconductor wafers. The foreign object detecting unit detects whether a foreign object exists on the scanning face based on the image data on the page of the document scanned on the scanning face.