A logic system in an intersystem link (ISL) unit accommodating the transfer of binary coded information between communication busses in a data processing system is disclosed, wherein dedicated locations in a file register are selected at the bus rate in response to binary coded information received from a local communication bus. ISL transactions to be initiated in response to bus cycle requests thereby are identified. ISL transactions are handled in parallel, and memory transfers are segregated...

"A Manufacturing Automation Protocol (MAP) interface unit couples a local area network (LAN) to a MAP network. The LAN includes a plurality of industrial programmable logic controllers (PLCs) and the MAP network includes a plurality of MAP devices. The MAP interface unit comprises a CPU for performing a plurality of routines. A first routine controls the coupling of the MAP interface unit to the MAP network and a second routine controls the coupling of the MAP interface unit to the LAN. A furthe...

A method and arrangement is disclosed for extending a resource search across a gateway node connecting a peer-to-peer network with a subarea network. An interface node is divided into a first section associated with the peer network and a second section associated with the subarea network. In response to a resource search request arriving at one of the sections from the network with which the section is associated, a directory of resources known by the respective section is first searched. If th...

A hierarchical network hierarchically connects a plurality of networks whose nodes are mutually connected by connection paths as a p-array n-dimensional cube to configure a single network. A plurality of nodes are selected from lower layer p-array n-dimensional cubes, and the selected gate nodes are mutually connected as a p-array m-dimensional cube to configure a p-array m-dimensional network on the next layer. Similarly, gate nodes are selected from a plurality of next-layer p-array m-dimensio...

Set-top terminals utilized in broadband broadcast networks are becoming increasingly intelligent (programmable). However, transmitting executable code, data and interactive audio/video materials through a selectively dedicated link requires an extensive, broadband point-to-point broadband network, which is prohibitively expensive to implement for large numbers of customers. The present invention provides for downloading application software and transmitting audio/video information through one ch...

The disclosure describes a system to permit communication between two dissimilar networks that involves an interface system. More particularly, it is an interface system to permit communication between a MAP network that is utilizing common application service elements (CASE) and a network of non-MAP computer equipment. The interface system that is described establishes a connection between the two networks which involves a process of decoding data from one network into predetermined component p...

A bridge device for connecting networks together via data link layers, that assigns input port numbers unique to each port, to headers of input memory access control packets. A content-addressable memory stores destination addresses and groups of port numbers corresponding to the destination addresses. A determiner such as a controller determines whether or not a destination address of a memory access control packet is stored in the memory and determines whether or not a port number correspondin...

For facilitating data communication between entities in a local area network (storage files, programs, devices, human operators, etc.), a method is disclosed for addressing such communications to logical names adopted for the entities; rather than to discrete physical locations in the network. The subject method allows for extension of name-directed communications across bridges (between separate communication media or between discrete frequency channels on one medium). Extensions of such commun...

A facility called "Gateway" is used to interconnect a plurality of independently controlled communication networks so that logical units (LUs) in the networks can communicate with one another without any changes to the network. The gateway includes a programmable device or devices which establish and monitor cross network sessions and for each formatted message, on the session, the programmable device changes the contents on the request unit (RU) and/or the transmission header (TH) fields so tha...

An adaptive networking device including a plurality of network ports operable at any one of a plurality of media standards, a bus and a first device coupled to the bus that communicatively couples to any of the network ports that operate at a first media standard in order to transfer data between the bus and network ports communicatively coupled to the first device. The adaptive networking device further includes a second device operable at a second media standard and including a link port, wher...