Switching hub which implements a virtual bus for interconnecting

Details Switching hub which implements a virtual bus for interconnecting Switching hub which implements a virtual bus for interconnecting

1993-02-05

1994-09-06

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 853, 370 943, 370 8513, H04L 1246, H04L 1266

Patent

active

053454472

ABSTRACT:
An apparatus for interconnecting a plurality of segments each of which operates in accordance with a bus protocol specifying collision detection and propagation operations. The apparatus includes a switching mechanism including a backplane having P signal paths and P switch ports each with an input and an output. The input of each switch port is connected to a different one of the P signal paths and at each switch port it connects a selectable one or more of the P signal paths to the output for that switch port. The apparatus also includes a plurality of port circuits each connected to a different one of the ports of the switching mechanism. Each port circuit includes an interface to which one of the plurality of segments is connected and through which that port circuit receives a data signal from and transmits a data signal to the attached segment; an auto-partition state machine connected to the interface for that port circuit receiving the data signal from the segment connected to that port circuit's interface and generating therefrom a single output signal on the output line of that port circuit, the auto-partition state machine performing partitioning functions for that port circuit' s segment; and a control state machine receiving a signal over the input for that port circuit and using that signal to implement the collision detection and propagation operations of the bus protocol for the segment connected to that port circuit.

REFERENCES:
patent: 4710769 (1987-12-01), Friedman et al.
patent: 4805169 (1989-02-01), Van Asselt
patent: 5187605 (1993-02-01), Shikata et al.
AT&T Advance Data Sheet for T7202 Smart Hub Controller (SHC), 1991.
ANSI/IEEE Std 802.3 specification for Repeater Unit for 10 Mb/s Baseband Networks, 1992.
IEEE 802.3i-1990 Protocol specification for Twisted-Pair Medium Attachment Unit and Baseband Medium, Type 10BASE-T, 1990.
Advanced Micro Devices Am79C980 Integrated Multiport Repeater Specification, Jan. 1992.
National Semiconductor DP83950A Repeater Interface Controller Specification 1992.

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