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    1.
    发明专利
    未知

    公开(公告)号：DE69123104T2

    公开(公告)日：1997-04-30

    申请号：DE69123104

    申请日：1991-06-17

    Applicant: IBM

    Inventor： BROWN PAUL JOSEPH ,  ELLIOTT JOSEPH CHARLES ,  HOPPE KARL HELMUTH ,  LYNCH KENNETH ROBERT ,  SACHS MARTIN WILLIAM

    IPC: G06F13/14 ,  G06F13/40

    Abstract: A computer I/O system which includes a dynamic switch (10) having a plurality of ports (P) and a plurality of link-level facilities, with each link-level facility being attached to an individual one of the ports (P). Whenever the state of a port (P) or its attached link-level facility is changed in such a way that the attached link-level facility's ability to communicate with another link-level facility might be affected, this fact is recognized by a dynamic switch control unit (20) which causes a state change notification (SCN) frame to be transmitted to all other link-level facilities which might be affected. The link-level facilities receiving such a state change notification then determine if any of the associations or potential associations with the link-level facility which caused the state change notification are affected.

    2.
    发明专利
    未知

    公开(公告)号：DE69122013T2

    公开(公告)日：1997-03-13

    申请号：DE69122013

    申请日：1991-06-18

    Applicant: IBM

    Inventor： ELLIOTT JOSEPH CHARLES ,  HEFFERON EUGENE PAUL ,  MERITT ALLAN SAMUEL ,  SACHS MARTIN WILLIAM ,  SNEDAKER MARK CARL

    IPC: G06F13/00 ,  G06F12/06 ,  G06F13/14 ,  G06F13/40 ,  G06F13/42 ,  G06F15/173 ,  H04L29/12

    Abstract: In a computer I/O system including a plurality of link-level facilities and a dynamic switch (10) having a plurality of ports (P), each link-level facility being attached to an individual one of the ports (P), a mechanism and method for assigning a unique link level address to each of the link-level facilities. As each of the link-level facilities comes on line, it sends an acquire link address (ALA) frame and waits for a response (ACK) frame. The ALA frame may be addressed to a general to-whom-it-may-concern address and have a source address of who-am-I. Only a dynamic switch (10) normally assigns link addresses. When receiving (110) an ALA frame, the dynamic switch returns (115) an ACK frame having a unique link address assigned to the sender of the ALA frame. Provision is made for determining if there is a dynamic switch present, or, if the link-level facilities are connected together by a static connection through the dynamic switch, for the link-level facility of a channel to assign the unique link addresses.

    4.
    发明专利
    未知

    公开(公告)号：DE69123663T2

    公开(公告)日：1997-06-26

    申请号：DE69123663

    申请日：1991-05-02

    Applicant: IBM

    Inventor： ELLIOTT JOSEPH CHARLES

    IPC: G06F13/12 ,  G06F13/40

    Abstract: A mechanism for establishing a logical relationship between a channel (CHAN) and a control unit (CU), called a logical channel path, in a computer input/output system wherein a dynamic switch (10) is provided between the channel and the control unit. The disclosed logical path mechanism provides for the sharing of the same physical path by one or more channels to one or more control units. The initialization procedure disclosed identifies each sharing channel to each control unit configured to that channel for identifying the physical path to that channel in an input/output system wherein a switch between the channels and the control units provides a multipoint topology.

    7.
    发明专利
    未知

    公开(公告)号：DE69123663D1

    公开(公告)日：1997-01-30

    申请号：DE69123663

    申请日：1991-05-02

    Applicant: IBM

    Inventor： ELLIOTT JOSEPH CHARLES

    IPC: G06F13/12 ,  G06F13/40

    Abstract: A mechanism for establishing a logical relationship between a channel (CHAN) and a control unit (CU), called a logical channel path, in a computer input/output system wherein a dynamic switch (10) is provided between the channel and the control unit. The disclosed logical path mechanism provides for the sharing of the same physical path by one or more channels to one or more control units. The initialization procedure disclosed identifies each sharing channel to each control unit configured to that channel for identifying the physical path to that channel in an input/output system wherein a switch between the channels and the control units provides a multipoint topology.

    8.
    发明专利
    未知

    公开(公告)号：DE69122013D1

    公开(公告)日：1996-10-17

    申请号：DE69122013

    申请日：1991-06-18

    Applicant: IBM

    Inventor： ELLIOTT JOSEPH CHARLES ,  HEFFERON EUGENE PAUL ,  MERITT ALLAN SAMUEL ,  SACHS MARTIN WILLIAM ,  SNEDAKER MARK CARL

    IPC: G06F13/00 ,  G06F12/06 ,  G06F13/14 ,  G06F13/40 ,  G06F13/42 ,  G06F15/173 ,  H04L29/12

    Abstract: In a computer I/O system including a plurality of link-level facilities and a dynamic switch (10) having a plurality of ports (P), each link-level facility being attached to an individual one of the ports (P), a mechanism and method for assigning a unique link level address to each of the link-level facilities. As each of the link-level facilities comes on line, it sends an acquire link address (ALA) frame and waits for a response (ACK) frame. The ALA frame may be addressed to a general to-whom-it-may-concern address and have a source address of who-am-I. Only a dynamic switch (10) normally assigns link addresses. When receiving (110) an ALA frame, the dynamic switch returns (115) an ACK frame having a unique link address assigned to the sender of the ALA frame. Provision is made for determining if there is a dynamic switch present, or, if the link-level facilities are connected together by a static connection through the dynamic switch, for the link-level facility of a channel to assign the unique link addresses.

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