公开(公告)号：BR9405115A

公开(公告)日：1995-08-08

申请号：BR9405115

申请日：1994-12-15

Applicant: IBM

Inventor： MOORE VICTOR S ,  VAN DUREN RICHARD G ,  MADISON NORMAN L

IPC: H04L12/28 ,  H04L12/46

Abstract: A method and system for maintaining a routing path between a selected workstation (18) and a mobile workstation (36) within a multisegment local area network (10) wherein individual segments (12,14,16) are interconnected by a router device (28,30) and wherein selected segments (14,16) include radio frequency transceivers adapted to provide a wireless communications link with mobile workstations (36). Each time communication is established between a mobile workstation (36) and a selected workstation (18), two routing table entries are established which identify a segment location (14) for the mobile workstation (36) and a segment location (12) for the selected workstation (18) within a routing table (86,84) associated with each router device (28,30). Thereafter, all routing table entries which identify the segment location (14) for the mobile workstation (36) are automatically deleted in response to a termination of communications between the mobile workstation (36) and the radio frequency transceiver. Routing path determination does not require the maintenance of routing path information at each workstation within the multisegment local area network.

公开(公告)号：DE69431946D1

公开(公告)日：2003-02-06

申请号：DE69431946

申请日：1994-10-31

Applicant: IBM

Inventor： MOORE VICTOR S ,  VAN DUREN RICHARD G ,  WU DAVID C

IPC: H04L12/28 ,  H04L12/46 ,  H04B7/26

Abstract: A method and system for maintaining a routing path between a selected workstation (18) and a mobile workstation (36) within a multisegment local area network (10) wherein individual segments (12,14,16) are interconnected by a router device (28,30) and wherein selected segments (14,16) include radio frequency transceivers adapted to provide a wireless communications link with mobile workstations (36). Each time communication is established between a mobile workstation (36) and a selected workstation (18), two routing table entries are established which identify a segment location (14) for the mobile workstation (36) and a segment location (12) for the selected workstation (18) within a routing table (86,84) associated with each router device (28,30). Thereafter, all routing table entries which identify the segment location (14) for the mobile workstation (36) are automatically deleted in response to a termination of communications between the mobile workstation (36) and the radio frequency transceiver. Routing path determination does not require the maintenance of routing path information at each workstation within the multisegment local area network.

公开(公告)号：DE69431946T2

公开(公告)日：2003-10-02

申请号：DE69431946

申请日：1994-10-31

Applicant: IBM

Inventor： MOORE VICTOR S ,  VAN DUREN RICHARD G ,  WU DAVID C

IPC: H04L12/28 ,  H04L12/46 ,  H04B7/26

Abstract: A method and system for maintaining a routing path between a selected workstation (18) and a mobile workstation (36) within a multisegment local area network (10) wherein individual segments (12,14,16) are interconnected by a router device (28,30) and wherein selected segments (14,16) include radio frequency transceivers adapted to provide a wireless communications link with mobile workstations (36). Each time communication is established between a mobile workstation (36) and a selected workstation (18), two routing table entries are established which identify a segment location (14) for the mobile workstation (36) and a segment location (12) for the selected workstation (18) within a routing table (86,84) associated with each router device (28,30). Thereafter, all routing table entries which identify the segment location (14) for the mobile workstation (36) are automatically deleted in response to a termination of communications between the mobile workstation (36) and the radio frequency transceiver. Routing path determination does not require the maintenance of routing path information at each workstation within the multisegment local area network.

公开(公告)号：CA1182577A

公开(公告)日：1985-02-12

申请号：CA419296

申请日：1983-01-12

Applicant: IBM

Inventor： HEATH CHESTER A ,  VAN DUREN RICHARD G

IPC: G06F15/16 ,  G06F13/00 ,  G06F13/12 ,  G06F13/28 ,  G06F15/17 ,  G06F15/177

Abstract: CYCLE STEALING I/O CONTROLLER WITH PROGRAMMABLE OFFLINE MODE OF OPERATION A dual mode microprocessor acts either as a front-end I/O controller processor relative to a primary/ host processor and device or as a secondary data processor having independent storage, processing and I/O capabilities. Host software prepares device control block (DCB) arrays, which contain primary commands interpretable by the microprocessor and evoke these modes. Each DCB contains a chaining bit permitting its interpretation sequence to be chained (or not chained) to another DCB sequence, and a mode bit defining either a high speed DI/DO (HS) mode of operation or a programmable offline (PO) mode. In HS mode the microprocessor conditions associated adapters to transfer a specified amount of data between the host memory and device, through a specified interface busing path and in a specified bit-parallel format. The adapters perform this transfer in an autonomous manner, i.e., without assistance from either processor. In PO mode the microprocessor directs associated elements to perform one or more programs of operations defined by secondary commands contained in a command list. Such lists, prepared in advance in host system memory, are transferred to the microprocessor's memory by special PO mode "LOAD" type DCB's, and interpreted in response to special PO mode type "START" DCB's. A list transferred by one LOAD DCB may be repeatedly accessed at various positions by several START DCB's. The architecture of the command list includes commands which permit the microprocessor to exchange data with the host and/or a device, perform arithmetic operations on data, perform bit and byte manipulative operations on data, and directly control the device interface. PO mode sequences are terminatable by the microprocessor in response to various internal and external conditions. Upon termination the microprocessor evokes either a DCB chaining action or a host system interruption for transferring concluding status, depending on the value of the chaining bit in the current (start type) DCB.

公开(公告)号：AT230536T

公开(公告)日：2003-01-15

申请号：AT94117160

申请日：1994-10-31

Applicant: IBM

Inventor： MOORE VICTOR S ,  VAN DUREN RICHARD G ,  WU DAVID C

IPC: H04L12/28 ,  H04L12/46 ,  H04B7/26

Abstract: A method and system for maintaining a routing path between a selected workstation (18) and a mobile workstation (36) within a multisegment local area network (10) wherein individual segments (12,14,16) are interconnected by a router device (28,30) and wherein selected segments (14,16) include radio frequency transceivers adapted to provide a wireless communications link with mobile workstations (36). Each time communication is established between a mobile workstation (36) and a selected workstation (18), two routing table entries are established which identify a segment location (14) for the mobile workstation (36) and a segment location (12) for the selected workstation (18) within a routing table (86,84) associated with each router device (28,30). Thereafter, all routing table entries which identify the segment location (14) for the mobile workstation (36) are automatically deleted in response to a termination of communications between the mobile workstation (36) and the radio frequency transceiver. Routing path determination does not require the maintenance of routing path information at each workstation within the multisegment local area network.

公开(公告)号：CA2130409A1

公开(公告)日：1995-06-17

申请号：CA2130409

申请日：1994-08-18

Applicant: IBM

Inventor： MOORE VICTOR S ,  VAN DUREN RICHARD G ,  WU DAVID C

IPC: H04L12/28 ,  H04L12/46

Abstract: A method and system for maintaining a routing path between a selected workstation (18) and a mobile workstation (36) within a multisegment local area network (10) wherein individual segments (12,14,16) are interconnected by a router device (28,30) and wherein selected segments (14,16) include radio frequency transceivers adapted to provide a wireless communications link with mobile workstations (36). Each time communication is established between a mobile workstation (36) and a selected workstation (18), two routing table entries are established which identify a segment location (14) for the mobile workstation (36) and a segment location (12) for the selected workstation (18) within a routing table (86,84) associated with each router device (28,30). Thereafter, all routing table entries which identify the segment location (14) for the mobile workstation (36) are automatically deleted in response to a termination of communications between the mobile workstation (36) and the radio frequency transceiver. Routing path determination does not require the maintenance of routing path information at each workstation within the multisegment local area network.

公开(公告)号：CA1184313A

公开(公告)日：1985-03-19

申请号：CA419287

申请日：1983-01-12

Applicant: IBM

Inventor： ANDREWS LAWRENCE P ,  HEATH CHESTER A ,  MEAD JUSTIN E ,  VAN DUREN RICHARD G ,  JANES GARY A

IPC: G06F13/12 ,  G06F13/38 ,  G06F13/40 ,  G06F13/42 ,  G06F3/00

Abstract: PERIPHERAL ATTACHMENT INTERFACE FOR I/O CONTROLLER HAVING CYCLE STEAL AND OFF-LINE MODES This I/O interface permits attachment of a data processing system to devices having different "handshaking" protocols and bit-parallel data exchange capacities. Handshaking control circuits permit the system to communicate with devices variously in pulsed and interlocked modes. Timer circuits provide a variety of different time reference signals for transfer to devices. Switching options associated with the timer permit selective use of timer outputs as pulsed mode handshaking functions. A counter circuit and associated interface port permit the system to count events associated with device-originated pulses. A switching option permits the counter incrementing operations to be governed by timer outputs. The interface also contains path selection lines. In one mode these lines define high speed exchange of data between a primary system processor and devices in various bit-parallel formats and over various buses designatable by a systems processor. In another mode these lines permit a secondary system processor to exchange data with a series of multiplexed devices. Collectively, the interface lines have a symmetrical configuration which permits their use for direct interconnection of two data processing systems without the expense of additional "channel to channel" adaptation.