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Teleprocessing System Initialization Using an External Network Description

IP.com Disclosure Number: IPCOM000074403D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Scharfenberg, KF: AUTHOR

Abstract

Teleprocessing (T.P.) networks of large real-time systems are often subject to changes due to the addition of new lines, new terminals on existing lines, or changes in the configuration of an existing terminal. If the configuration of the network were hard-coded in the T.P. program, the program would have to be modified by an experienced programmer and reassembled each time the network were changed. This procedure is time consuming, leaves room for human error, and may result in an undesirable delay in bringing up the system.

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Teleprocessing System Initialization Using an External Network Description

Teleprocessing (T.P.) networks of large real-time systems are often subject to changes due to the addition of new lines, new terminals on existing lines, or changes in the configuration of an existing terminal. If the configuration of the network were hard-coded in the T.P. program, the program would have to be modified by an experienced programmer and reassembled each time the network were changed. This procedure is time consuming, leaves room for human error, and may result in an undesirable delay in bringing up the system.

To overcome these problems, there is provided a technique for initializing the T.P. program to conform to the T.P. network by making reference to an external data set called the Network Configuration List (NCL). The data contained in the NCL is used for constructing line control blocks, polling lists, and other necessary control blocks and tables when the system is initialized.

Each entry in the NCL contains a drop identification number and all of the hardware addresses necessary to communicate with that drop. Other data such as starting and stopping times may also be included. The drop identification number is a permanently assigned sequential number which is used internally by the system for indexing into various tables in order to determine the origin or destination of the message to which the identification number has been appended. This number also provides a con...