公开(公告)号：DE69120659D1

公开(公告)日：1996-08-08

申请号：DE69120659

申请日：1991-02-19

Applicant: IBM

Inventor： SHAH VINAY VELJI ,  JUDD IAN DAVID ,  GRAINGER BERNARD JOHN ,  COCKBURN GORDON JOHN

IPC: H04L1/16 ,  H04L1/18

Abstract: PCT No. PCT/GB91/00257 Sec. 371 Date Sep. 25, 1992 Sec. 102(e) Date Sep. 25, 1992 PCT Filed Feb. 19, 1991 PCT Pub. No. WO92/10893 PCT Pub. Date Jun. 25, 1992.Described is a method of error recovery in a data communication system of the kind comprising two nodes connected by a serial link and wherein data is transmitted between the nodes in the form of packets of a predefined format. Each node receives data over an inbound line and transmits data over an outbound line. When an error is detected, both nodes enter a link check state, invoke a Link Error Recovery Procedure (ERP) and exchange status by means of Link Resets. Error recovery is performed separately for each line. Each node is responsible for recovering packets that were lost on its outbound line. In normal operation of the link, the transmitter does not reuse a packet buffer until it has received a response from the connected node indicating that the packet was correctly received. Therefore when an error occurs, the affected packets are still available for retransmission.

公开(公告)号：AU2003215727A1

公开(公告)日：2003-10-13

申请号：AU2003215727

申请日：2003-03-03

Applicant: IBM

Inventor： APPERLEY NORMAN ,  LEGG STEPHEN PETER ,  SHAH VINAY VELJI

IPC: G06F1/18 ,  G06F3/00 ,  G06F3/06 ,  G06F13/36 ,  G06F13/38

Abstract: An adapter for converting an interface of a data storage device is provided. The adapter has a first interface for connection to the interface of the data storage device and a second interface for connection to one or more host systems. The adapter includes a processor for converting commands and data between the first and second interfaces. The adapter transforms the data storage device to emulate physically and logically a higher availability and higher performance native data storage device. The adapter has a first connector compatible with the first interface for attachment to the data storage device and a second connector compatible with the second interface for attachment to the one or more host systems. The first and second connectors are disposed in the adapter in a back to back arrangement. The adapter logically separates commands for the data storage device from commands for the adapter.

公开(公告)号：DE69120659T2

公开(公告)日：1997-01-23

申请号：DE69120659

申请日：1991-02-19

Applicant: IBM

Inventor： SHAH VINAY VELJI ,  JUDD IAN DAVID ,  GRAINGER BERNARD JOHN ,  COCKBURN GORDON JOHN

IPC: H04L1/16 ,  H04L1/18

Abstract: PCT No. PCT/GB91/00257 Sec. 371 Date Sep. 25, 1992 Sec. 102(e) Date Sep. 25, 1992 PCT Filed Feb. 19, 1991 PCT Pub. No. WO92/10893 PCT Pub. Date Jun. 25, 1992.Described is a method of error recovery in a data communication system of the kind comprising two nodes connected by a serial link and wherein data is transmitted between the nodes in the form of packets of a predefined format. Each node receives data over an inbound line and transmits data over an outbound line. When an error is detected, both nodes enter a link check state, invoke a Link Error Recovery Procedure (ERP) and exchange status by means of Link Resets. Error recovery is performed separately for each line. Each node is responsible for recovering packets that were lost on its outbound line. In normal operation of the link, the transmitter does not reuse a packet buffer until it has received a response from the connected node indicating that the packet was correctly received. Therefore when an error occurs, the affected packets are still available for retransmission.

公开(公告)号：AT326719T

公开(公告)日：2006-06-15

申请号：AT03745201

申请日：2003-03-03

Applicant: IBM

Inventor： APPERLEY NORMAN ,  LEGG STEPHEN PETER ,  SHAH VINAY VELJI

IPC: G06F1/18 ,  G06F3/00 ,  G06F3/06 ,  G06F13/36 ,  G06F13/38

Abstract: An adapter for converting an interface of a data storage device is provided. The adapter has a first interface for connection to the interface of the data storage device and a second interface for connection to one or more host systems. The adapter includes a processor for converting commands and data between the first and second interfaces. The adapter transforms the data storage device to emulate physically and logically a higher availability and higher performance native data storage device. The adapter has a first connector compatible with the first interface for attachment to the data storage device and a second connector compatible with the second interface for attachment to the one or more host systems. The first and second connectors are disposed in the adapter in a back to back arrangement. The adapter logically separates commands for the data storage device from commands for the adapter.

公开(公告)号：GB2252020A

公开(公告)日：1992-07-22

申请号：GB9026336

申请日：1990-12-04

Applicant: IBM

Inventor： SHAH VINAY VELJI ,  JUDD IAN D ,  BEER REGINALD

IPC: H04L1/18 ,  H04L1/16 ,  H04L29/06 ,  H04L29/08

Abstract: Described is a system and method of communicating between first and second nodes connected by a serial link wherein the data is transmitted between the nodes in the form of packets made up of multiple bit frames. Each packet that is correctly received by the second node is acknowledged by means of a pair of multibit frames. These frames may be interleaved among the frames making up any outgoing data packet that is being transmitted by the second node. The technique employed provides unambiguous acknowledgment of each data packet and if a data packet is received incorrectly, the packet is available in a buffer in the first node for resending.

公开(公告)号：GB2250897A

公开(公告)日：1992-06-17

申请号：GB9026338

申请日：1990-12-04

Applicant: IBM

Inventor： SHAH VINAY VELJI ,  JUDD IAN D ,  GRAINGER BERNARD JOHN ,  COCKBURN GORDON JOHN

IPC: H04L1/16 ,  H04L1/18

Abstract: Described is a method of error recovery in a data communication system of the kind comprising two nodes connected by a serial link and wherein data is transmitted between the nodes in the form of packets of a predefined format. Each node receives data over an inbound line and transmits data over an outbound line. When an error is detected, both notes enter a link check state, invoke a Link Error Recovery Procedure (ERP) and exchange status by means of Link Resets. Error recovery is performed separately for each line. Each node is responsible for recovering packets that were lost on its outbound line. In normal operation of the link, the transmitter does not reuse a packet buffer until it has received a response from the connected node indicating that the packet was correctly received. Therefore, when an error occurs, the affected packets are still available for retransmission.