Abstract: An improved method of maintaining data throughput during handoff in a wireless communication link operating with the Mobile IP protocol is described. A first base station initially servicing a mobile subscriber unit is associated with a first Mobile IP foreign agent that is registered with the Mobile IP home agent as a first mobility binding between the subscriber unit and the home agent. When the subscriber unit issues a request to be handed off from the first base station to a second base station, a second foreign agent associated with the second base station is registered with the home agent as a simultaneous binding with the first mobility binding between the subscriber unit and the home agent. This permits both foreign agents to simultaneously receive a sequence of data packets from the home agent. Before handoff is executed, the data packet sequence routed to the second foreign agent is stored at the second base station.

Abstract: An optical inspection device for measuring the squareness of tube cuts. The optical inspection apparatus includes a tube guide for permitting rotation of the tube whereby its end wall thickness is positioned in the path of a light beam whose output end is magnified and projected on a viewing screen. Variations in the squareness of the tube end may be visually inspected by an operator on the viewing screen.