A high speed link used to connect peer computer systems. The link includes data lines and control lines connected to a device adapter in the I/O system of each of the peer computer systems and logic in each device adapter. The data lines carry data words in parallel; the control lines include status lines indicating status of each of the peer systems, arbitration lines for indicating which of the peer systems currently desires to transmit data across the link and whether the link is available, a...

A communication protocol for direct communications between operating system kernels of a plurality of processors in a clustered-type, shared virtual memory, multi-processor data processing system is disclosed. Each processor unit includes a intermachine communications software system ("IMCS") which may-be used by a trusted kernel of the operating system of the processor to communicate with a service in another processor, either directly or through an intermediate processor. Communications are in...

A transmission data processing method for transmitting inputted data comprises a data management step, a transmission data providing step and a transmission step. The transmission data providing step transmits the transmission data to the transmission step within a range such that the transmission data does not exceed prescribed units, in response to a transmission processing speed of the transmission step for transmitting the transmission data. The capturing of transmission data sent from a hos...

A method and apparatus for determining network access delays in a communications network is disclosed. The communications network has a plurality of stations interconnected in a communications network. An access delay interval determining means determines a network access delay for each of the plurality of stations. That is, a time interval between a station predetermined sequence of symbols received from each of the stations and a local predetermined sequence of symbols is determined based upon...

A method for providing synchronous message transfer is provided in an asynchronous operating environment in which conversational status can be established between communicating endpoints. The operating environment includes a transaction processing system having a plurality of terminals, a data communication component (DCC), and a transaction processor (XP) which exchanges message data with DCC for transmission to selected terminals. The method steps comprise ascertaining at the DCC whether a tra...

A method for managing the transmission of packet objects distinguishes between packet objects having and not having quality of service (QoS) requirements for transmission over a logical channel. Packet objects for a logical channel having QoS requirements are placed in a sorted tree queue based on its scheduled departure time and on a weighting system related to the QoS requirements. Packet objects for a logical channel only requiring best effort transmission are place in a FIFO queue. Each logi...

The present invention provides a system and method for transmitting and receiving data that can transmit data over a plurality of data paths simultaneously and that provides a plurality of transmission queues which enable data transmissions to be continuously prioritized and which do not cause bottlenecking of data. In the preferred embodiments, the present invention comprises a data transmission facility, at least one forward data path, at least one data reception facility, and at least one rev...

A method and apparatus for providing buffer state accounting at a link level, otherwise known as link flow control, in addition to flow control at the virtual connection level. Link flow control enables receiver cell buffer sharing while maintaining perconnection bandwidth with lossless cell transmission. High link level update frequency is enabled without a significant sacrifice in overall link forward bandwidth. A higher and thus more efficient utilization of receiver cell buffers is achieved.

A cell of an integrated circuit dedicated to a microprocessor, the cell comprising a data input/output circuit connected to a communications network working according to at least two different protocols called the DDC1 and I2C protocols and a control circuit provided with a sequencer, the control circuit being managed by the sequencer, the control circuit communicating with a control bus of the microprocessor and with the data input/output circuit; wherein the cell comprises a logic circuit whic...

A method in a computer network for automatically detecting a most advantageous protocol for communication by a client computer, said client computer being configured to be coupled to a server computer via a computer network. The method includes initiating a plurality of protocol threads for sending from the client computer to the server computer, a plurality of data requests. Each of the data requests employs a different protocol and a different connection. The data requests are configured to so...