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    VERY LARGE SCALE MODULAR SWITCH
    27.
    发明专利
    VERY LARGE SCALE MODULAR SWITCH 未知

    公开(公告)号：CA2074849C

    公开(公告)日：1997-02-25

    申请号：CA2074849

    申请日：1992-07-29

    Applicant: IBM

    Inventor： FRANASZEK PETER A ,  GEORGIOU CHRISTOS JOHN

    IPC: H04Q3/52 ,  G06F15/173 ,  H04Q11/04 ,  H04Q3/54

    Abstract: Switch resources for a one-sided crosspoint switch with distributed control (i.e., switch ports, internal busses and controllers) have been organized so that modular growth is facilitated by: (1) assigning each switch port uniquely to one of the controllers; (2) making each controller handle only the crosspoints connected to the switch ports assigned to it; (3) assigning each internal bus uniquely to one of the controllers; and (4) providing a means for the controllers to communicate with each other. Modular growth of any of the switch resources (i.e., switch ports, internal busses and/or controllers) is accommodated by effectively reallocating (i.e., modifying the assignment of) some or all of the resources. Failure of a switch resource is accommodated also by effectively reallocating (i.e., modifying the assignment of) some or all of the remaining usable resources. It is contemplated that modification of resource allocation can be done in various alternative ways, either physically or electronically, including automatically and even dynamically.

    28.
    发明专利
    未知

    公开(公告)号：DE68922581D1

    公开(公告)日：1995-06-14

    申请号：DE68922581

    申请日：1989-10-03

    Applicant: IBM

    Inventor： FRANASZEK PETER A ,  GEORGIOU CHRISTOS JOHN

    IPC: G06F15/173 ,  H04L12/56 ,  G06F15/16

    Abstract: A hierarchy of multipath networks selectively provides connections between a plurality of sources and a plurality of destinations in a communications system. The hierarchy comprises a first multipath network without buffering which consists of two or more stages and constituting a fast path for connecting a source to a destination. At least a second multipath network with buffering and comprising a plurality of stages constitutes an alternate, slower path for connecting a source to a destination in the event that a connection between the source and the destination is blocked in the fast path. The address field of a message from a source is examined at each stage to select an appropriate connection to the next stage and, if the connection is available, the message, stripped of the address field, is propagated to the second stage, but if the next stage is blocked, the message is stopped and a negative acknowledgment is returned to the source. Retransmission of the message through the second network of the hierarchy is initiated upon the receipt of a negative acknowledgment at the source. The concept may be extended to multiple levels, with only the last stage providing buffering.

    29.
    发明专利
    未知

    公开(公告)号：DE68916185D1

    公开(公告)日：1994-07-21

    申请号：DE68916185

    申请日：1989-10-21

    Applicant: IBM

    Inventor： FRANASZEK PETER A ,  GEORGIOU CHRISTOS JOHN

    IPC: H04Q3/52 ,  H04Q11/04 ,  H04L12/50

    Abstract: A high speed collision NxM tri-state crossbar switch (50) having M collision busses uses contention detection at the destination. In the event of a collision of messages, remedial action can be taken such as rerouting colliding messages over an alternate path provided by a second interconnection network (53) with contention resolution capability. Collision detection codes are transmitted prior to the transmission of messages to each input port (Po-Pn). The tri-state output buses are monitored for the collision detection codes to detect an error. In order to prevent damage to driver transistors connected to the tri-state buses when a contention occurs, current limiting is provided to limit the current through the driver transistors to a predetermined level.

    DELTA NETWORK OF A CROSS-POINT SWITCH
    30.
    发明专利
    DELTA NETWORK OF A CROSS-POINT SWITCH 未知

    公开(公告)号：CA1263729A

    公开(公告)日：1989-12-05

    申请号：CA501736

    申请日：1986-02-12

    Applicant: IBM

    Inventor： FRANASZEK PETER A

    IPC: H04Q3/54 ,  G06F15/167 ,  G06F15/173 ,  H04Q3/52 ,  H04Q3/68

    Abstract: DELTA NETWORK CONTROL OF A CROSS-POINT SWITCH A switching system comprising a cross-point switch and a Delta network. The two switches are connected in parallel with common port adaptors. When a port desires a specified time reservation to another port, it sends a request message for the specified time over the Delta network to the requested adaptor at which a reservation processor grants a connection for completion at a fixed time in the future. The reservation grant is then returned via the Delta network to the requesting adaptor which, at the fixed time, sets the crosspoint connection on the cross-point switch line associated with the requesting adaptor.

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