公开(公告)号：CA2023616C

公开(公告)日：1995-05-16

申请号：CA2023616

申请日：1990-08-20

Applicant: IBM

Inventor： BROWN PAUL J ,  ELLIOTT JOSEPH C ,  FRANASZEK PETER A ,  HOPPE KARL H ,  LYNCH KENNETH R ,  SACHS MARTIN W ,  SKARSHINSKI LEON

IPC: H04L12/56 ,  H04Q3/42

Abstract: A dynamic switch and its protocol for establishing dynamic connections in a link by the use of frames, each frame having an identification of the source of the frame, an identification of the destination of the frame for the requested connection, and link controls to maintain, initiate or terminate a connection between the source and the destination. The frames are bounded by a start of frame delimiter and an end of frame delimiter which may also act as a connect link control and a disconnect link control, respectively, and the onnections are made through the dynamic switch having dynamic-switch ports. The state of a dynamic-switch port is changed dependent on its present state, the dynamic connection requested, and the direction and type of frames passing through the dynamic-switch port.

公开(公告)号：BR9005263A

公开(公告)日：1991-09-17

申请号：BR9005263

申请日：1990-10-18

Applicant: IBM

Inventor： BROWN PAUL J ,  ELLIOTT JOSEPH C ,  FRANASZEK PETER A ,  HOPPE KARL H ,  LYNCH KENNETH R ,  SACHS MARTIN W ,  SKARSHINKSI LEON

IPC: H04L12/56 ,  G06F13/20 ,  G06F13/42

公开(公告)号：CA2029603A1

公开(公告)日：1991-05-29

申请号：CA2029603

申请日：1990-11-08

Applicant: IBM

Inventor： BAILEY CHRISTOPHER J ,  COX MICHAEL C ,  CWIAKALA RICHARD ,  DIRKS LYNN M ,  FIRM WILLIAM R ,  FISHER GARY A ,  GALLAGHER ROBERT J ,  HOPPE KARL H ,  KANIA PETER I ,  VALLEE LAWRAINE J

IPC: G06F13/14 ,  G06F13/40 ,  G06F15/173

Abstract: A computer system, including at least one host (processor and operating system), a channel subsystem and at least one switch (together with an associated switch controller) for switchably connecting an I/O device (together with an associated I/O device control unit) to a host via said channel subsystem, in combination with means for dynamically managing I/O connectivity in said computer from each host. The I/O manager's functions are centralized at the host level across the computer system. Each host is responsible for an instance of the manager. According to the preferred embodiment of the invention the computer system, I/O manager combination includes: (a) first means, located within each switch, for providing direct host access to the switch controller associated with a given switch; (b) second means, included in each host level instance of the manager, for automatically and dynamically determining the current I/O configuration and connectivity of each host; (c) third means, included in each host level instance of the manager, for performing System Integrated Switching (i.e., switching where any instance of the I/O manager can veto a proposed configuration change) and (d) fourth means, included in each host level instance of the manager, for insuring the integrity of the I/O connectivity database, through the use of an interlock mechanism, in a multiuser environment where each user can enter multiple part commands and processes concurrently.