A transformer includes first and secondary transformer windings formed on an iron core. A STA and a target AP communicate high throughput-related information and the STA performs a basic service set transition to the target AP based on the high throughput-related information. , alumina for supporting, on the surface of cell walls has come to arouse a trouble that the resultant coat layer is thick and cell clogging is more apt to occur. The cable hanger is made by a tool using a rotating spool designed to shape the rigid shaft into a fastening loop at one end and a support loop at the other end.