At&t Bell Laboratories

American Telephone and Telegraph, Co.

Paradyne Corporation

Steven D Hunt

Richard K Smith

Edward W Landis

James L Archibald

The apparatus includes a movable card guide mechanism for receiving a PC add-on board. The movable card guide mechanism moves vertically to seat the add-on board in, or remove the add-on board from, a bus connector when an external latch is moved inward or outward. The external latch is attached to the movable card guide mechanism by means of an actuator, and the movable card guide mechanism is mounted to the inside top wall of the PC's chassis. Thus, when the actuator moves in one direction, the movable card guide mechanism is moved down, seating the edge connector of an add-on board in a bus connector on the PC's motherboard, and when it moves in the other direction, the movable card guide mechanism is moved up, removing the add-on board from the bus connector.

PC add-on board installation apparatus for industrial applications

A WAN is formed using Frame Relay Protocol and a telephone network interface unit. An originating LAN sends a message to a router which communicates with a telephone network interface unit using Frame Relay Protocol. The telephone network interface unit determines the destination of a packet received from the router by interpreting the Frame Relay Protocol, and it associates a phone number with that destination. The interface unit uses the phone number to establish at least one DSO connection over a digital telephone network to a destination network interface. A destination network interface unit receives the packet from the digital telephone network and provides the packet to a router which interfaces to the destination LAN. The network interface units add or drop additional DSO channels as required by the traffic load and thereby provide variable bandwidth.

Wide area network (WAN)-arrangement

A secure method of accessing a computer facility is provided within the data communications equipment (DCE), e.g., a modem or a terminal server, by the use of Calling Party Directory Number (CPDN). In particular, a telephone line from the local public switched telephone network is configured to provide CPDN information. This telephone line terminates in the DCE, which stores a plurality of lists, each list comprising a plurality of CPDN numbers. Upon receiving a telephone call from a calling party, the DCE takes one of three courses of action depending on the calling party's CPDN: 1) the DCE can answer the telephone call if the calling party's CPDN is on the 'caller pays' list; 2) the DCE can refuse to answer the telephone call and then return the telephone call if the CPDN is on the 'we pay' list; or 3) the DCE can simply not answer, or return, the telephone call if the calling party's CPDN is not found on any of the plurality of lists.

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Freehold, NJ, United States of America

Steven D Hunt