公开(公告)号：JPS62160845A

公开(公告)日：1987-07-16

申请号：JP27552086

申请日：1986-11-20

Applicant: IBM

Inventor： HAILPERN BRENT TZION ,  HOEVEL LEE WINDSOR ,  THEFAINE YANNICK JEAN

IPC: H04L12/00 ,  H04L12/44

公开(公告)号：JPS62160842A

公开(公告)日：1987-07-16

申请号：JP27551686

申请日：1986-11-20

Applicant: IBM

Inventor： FRIEDMAN LEE GARY ,  HAILPERN BRENT TZION ,  HOEVEL LEE WINDSOR ,  THEFAINE YANNICK JEAN

IPC: H04L12/00 ,  H04L12/44

公开(公告)号：DE3687648T2

公开(公告)日：1993-08-12

申请号：DE3687648

申请日：1986-11-25

Applicant: IBM

Inventor： HAILPERN BRENT TZION ,  HOEVEL LEE WINDSOR ,  THEFAINE YANNICK JEAN

IPC: H04L12/00 ,  H04L12/44

Abstract: A circuit-switched local area network relies on a star topology for data transfer. Signalling informa­tion is confined to a single common signalling link or channel (S). Contention on the signalling link or channel is obviated by the use of a contention re­solution device (60) which is coupled to all ports (10) for receiving requests to send from the ports and for providing clear to send messages to the requesting ports, in turn. A port desiring communication with another port first raises its request to send and when it receives a clear to send from the contention resolution device, it places the message or call set up information on the signalling link or channel. Once the call or message set up information has been transmitted, the addressing port may de-assert its request to send which will result in the contention resolution device de-asserting the clear to send.

公开(公告)号：DE3687648D1

公开(公告)日：1993-03-11

申请号：DE3687648

申请日：1986-11-25

Applicant: IBM

Inventor： HAILPERN BRENT TZION ,  HOEVEL LEE WINDSOR ,  THEFAINE YANNICK JEAN

IPC: H04L12/00 ,  H04L12/44

Abstract: A circuit-switched local area network relies on a star topology for data transfer. Signalling informa­tion is confined to a single common signalling link or channel (S). Contention on the signalling link or channel is obviated by the use of a contention re­solution device (60) which is coupled to all ports (10) for receiving requests to send from the ports and for providing clear to send messages to the requesting ports, in turn. A port desiring communication with another port first raises its request to send and when it receives a clear to send from the contention resolution device, it places the message or call set up information on the signalling link or channel. Once the call or message set up information has been transmitted, the addressing port may de-assert its request to send which will result in the contention resolution device de-asserting the clear to send.

公开(公告)号：DE3688285T2

公开(公告)日：1993-10-28

申请号：DE3688285

申请日：1986-11-25

Applicant: IBM

Inventor： FRIEDMAN LEE GARY ,  HAILPERN BRENT TZION ,  HOEVEL LEE WINDSOR ,  THEFAINE YANNICK JEAN

IPC: H04L12/00 ,  H04L12/44 ,  H04L12/28

Abstract: A switching system (50) or local area network is non-blocking, transmit-secure and employs a star type topology. A back plane (50B) uses n(n-1) bus lines to interconnect n ports (30). Each port can transmit on any one of n-1 bus lines depending on the identity of the destination port. Likewise, each port can receive from any of n-1 bus lines, depending on the identity of the transmitting port. Signalling as well as data flow on the same bus lines. Each of the ports includes a dedicated microprocessor (303) along with an arbit­rator (306) to resolve contention. The ports further have transmit and receive multiplexers (305, 302) coupled between the back plane and an associated work station or information source/sink.

公开(公告)号：DE3688285D1

公开(公告)日：1993-05-19

申请号：DE3688285

申请日：1986-11-25

Applicant: IBM

Inventor： FRIEDMAN LEE GARY ,  HAILPERN BRENT TZION ,  HOEVEL LEE WINDSOR ,  THEFAINE YANNICK JEAN

IPC: H04L12/00 ,  H04L12/44 ,  H04L12/28

Abstract: A switching system (50) or local area network is non-blocking, transmit-secure and employs a star type topology. A back plane (50B) uses n(n-1) bus lines to interconnect n ports (30). Each port can transmit on any one of n-1 bus lines depending on the identity of the destination port. Likewise, each port can receive from any of n-1 bus lines, depending on the identity of the transmitting port. Signalling as well as data flow on the same bus lines. Each of the ports includes a dedicated microprocessor (303) along with an arbit­rator (306) to resolve contention. The ports further have transmit and receive multiplexers (305, 302) coupled between the back plane and an associated work station or information source/sink.