Abstract: An improved electromagnetic interference connection between a pair of electromagnetic interference enclosures that provides electromagnetic compatibility for electrical devices housed in the pair of electromagnetic interference enclosures. The connection includes of a detachable lap joint integrally formed along a first pair of edges in a first electromagnetic interference enclosure and a second pair of edges in a second electromagnetic interference enclosure. The lap joint forms a detachable overlapping metallic joint between the pair of electromagnetic interference enclosures that prevents electromagnetic emissions from the joint without the use of seals or fasteners.

Abstract: The low profile backplane jumper board is mounted over the connector pins on the circuit pack side of the backplane to thereby selectively interconnect designated conductors in the connectors. These interconnections among connector conductors can be within a single connector or can span multiple connecters. The low profile backplane jumper board comprises a circuit board that contains holes for each of the backplane connector pins over which it is inserted. The ones of these holes that require an electrical connection to the associated backplane connector conductor are filled with a miniature spring socket assembly contact which is soldered to or press fit into the plated hole and associated conductors formed on the surface of the circuit board to interconnect a plurality of the holes formed in the circuit board. The thickness of the circuit board is selected to be of sufficient thinness to not interfere with the connection of the circuit packs to the associated connectors.

Abstract: A digital port includes a passive bus and, at least, the registration and call transfer features associated with a switch to provide cellular wireless capability. The passive bus allows a base station to be connected to the channel and thereby interface a plurality of wireless terminals to the switch. While only some of the wireless terminals in the neighborhood of a base station can be active concurrently (as is the case in all wireless systems) by way of a digital communication channel that is included in the passive bus, the switch can register and, hence, keep track of, a larger number of wireless terminals that are present in the base station's neighborhood. The passive bus also includes at least one circuit switched channel to allow communication with one or more wired or wireless terminals.

Abstract: In a wireless telecommunications system (FIG. 1), over-the-air operations of a plurality of base stations (11 ) are synchronized via a synchronization signal that is embedded in the normal communications protocol that is used to convey traffic between a control switch (12) and the base stations. In the physical-layer protocol of the ISDN S or T basic-rate interface, the S or M bits are employed to conduct the synchronization signal. The synchronization signal is generated in the control switch and broadcast therein to port circuit packs (310) via a synchronization bit of a dedicated time-slot of a TDM bus (303).