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Interdomain Communication between VTAM Systems Utilizing Existing SNA Cluster Interfaces

IP.com Disclosure Number: IPCOM000085735D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hill, B: AUTHOR [+2]

Abstract

Described is a method of communicating between Virtual Telecommunication Access Method (VTAM) systems using software. VTAM interfaces which are normally used to communicate to System Network Architecture (SNA) clusters can be made to perform logical operations that are not restricted to the existence of a SNA cluster.

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Interdomain Communication between VTAM Systems Utilizing Existing SNA Cluster Interfaces

Described is a method of communicating between Virtual Telecommunication Access Method (VTAM) systems using software. VTAM interfaces which are normally used to communicate to System Network Architecture (SNA) clusters can be made to perform logical operations that are not restricted to the existence of a SNA cluster.

A normal VTAM system comprises a host processor connected to a network controller which communicates via a synchronous data link with a SNA cluster, comprised of a plurality of programmable logical units which interface with various input/output (I/O) devices. The network control program programs each logical unit to provide an addressable I/O controller.

In the described method, this addressable unit is used to communicate between VTAM systems without adding cross domain knowledge to the VTAM. The interface from VTAM to the network controller remains the same as for SNA clusters. Changes are made in the network control program for supporting a new type of addressable unit, one related to a nonphysical structure.

A new Boundary Network Node code unique to the requested logical operation is added to the Boundary Network Node code that already exists. The new Boundary Network Node code acts as a router to an addressable unit in the Network controller of another VTAM system.

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