Abstract: A permanent electronic serial number unit for use with a network electronic device that includes a member having a machine readable pattern of unique identification information, a mechanism for propagating a read signal onto the member and a mechanism for detecting the read signal after it has been propagated to the member. The unit is preferable coupled to the processor of an electronic device connected to a network such that the electronic device may be identified by the network administrator. The unit may be positioned in the structural frame of an electronic device such that the same unique identification information is visible in a human readable form on the exterior of the frame.

Abstract: A boundary-scan circuit for a bidirectional pin of an integrated circuit which uses fewer standard cells if a cell design is considered, or fewer devices if non-standard cell integrated circuits are considered. In either case, the present invention provides the same functionality as provided in of the bidirectional boundary-scan circuits shown in TEEE 1149.1 in a circuit that should be more compact for the same logic family and integration technology.