Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Patent
1997-11-06
1999-10-05
Ray, Gopal C.
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
375211, 326 30, G06F 1300, G06F 15173, H04B 336, H04L 2520
Patent
active
059616199
ABSTRACT:
An automatically activated bus termination circuit in a repeater which is suitable for inclusion in a repeater stack including an end unit determination circuit. The end unit determination circuit includes a local input connector having an input sense pin. The input sense pin is configured to be connected to an input sense potential when the local input connector is connected to a remote output connector having an output sense pin. The output sense pin is configured to be connected to an output sense potential when the local output connector is connected to a remote input connector. The bus termination circuit is configured to be active when either the input sense pin is not connected to the input sense potential or the output sense pin is not connected to the output sense potential. As a result, the bus termination circuit is activated when a stack bus connection cable is not connected from the local output connector to a remote input connector or when a stack bus connection cable is not connected from the local input connector to a remote output connector.
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Network Systems Tutorial for IEEE Std 802.3, Repeater Functions and System Design Topology Considerations for Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Local Area Networks (LANs); Section 4, Repeater Functions, pp. 7-14 (1995).
International Standard ISO/IEC 8802-3: 1996(E) ANSI/IEEE Std 802.3, 1996 Edition; Carrier sense multiple access with collision detection (CSMA/DC) access method and physical layer specifications; Section 9, Repeater unit for 10 Mb/s baseband networks, pp. 125-155.
Cisco Technology Inc.
Ray Gopal C.
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