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THE DATA CONCENTRATOR

IP.com Disclosure Number: IPCOM000128393D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Sep-15

Publishing Venue

Software Patent Institute

Related People

Mills, David: AUTHOR [+3]

Abstract

This report describes a programmable transmission control unit which is attached to an IBM System/360 Model 67 machine operated in a timeshared environment. Called the Data Concentrator, this device provides service for AT&T teletype equipment, IBM typewriter terminal equipment, and remotely located computer equipment interconnected with serial-synchronous transmission data sets. The Data Concentrator is constructed of several different kinds of line adapters which connect on one hand to all types of AT&T data sets available for use on the switched-network, and on the other to a modified Digital Equipment Corporation PDP-8 computer' Connection is made between the System/360 multiplex channel and the PDP-8 by means of a special interface which provides a direct connection to the control lines emanating from the multiplex channel and presents a behavior compatible with other IBM transmission control units. The programmable nature of the Data Concentrator provides an unusually rich variety in transmission protocol and operational modes for its attached terminal equipment yet with minimal modifications to extant System/360 control programs.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 3% of the total text.

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THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

THE DATA CONCENTRATOR

THE UNIVERSITY OF MICHIGAN Technical Report 8 David Mills

CONCOMP: Research in Conversational Use of Computers F.H. Westervelt, Project Director ORA Project 07449

supported by: ADVANCED RESEARCH PROJECTS AGENCY DEPARTMENT OF DEFENSE WASHINGTON, D.C.

CONTRACT NO. DA-49-083 OSA-3050 ARPA ORDER NO. 716

administered through: OFFICE OF RESEARCH ADMINISTRATION ANN ARBOR

May 1968

ABSTRACT

This report describes a programmable transmission control unit which is attached to an IBM System/360 Model 67 machine operated in a timeshared environment. Called the Data Concentrator, this device provides service for AT&T teletype equipment, IBM typewriter terminal equipment, and remotely located computer equipment interconnected with serial-synchronous transmission data sets. The Data Concentrator is constructed of several different kinds of line adapters which connect on one hand to all types of AT&T data sets available for use on the switched-network, and on the other to a modified Digital Equipment Corporation PDP-8 computer' Connection is made between the System/360 multiplex channel and the PDP-8 by means of a special interface which provides a direct connection to the control lines emanating from the multiplex channel and presents a behavior compatible with other IBM transmission control units. The programmable nature of the Data Concentrator provides an unusually rich variety in transmission protocol and operational modes for its attached terminal equipment yet with minimal modifications to extant System/360 control programs.

TABLE OF CONTENTS

ABSTRACT.....iii
LIST OF FIGURES.....ix
PREFACE.....xi
I. INTRODUCTION AND APPLICATION.....1
1.1 Operational Flexibility.....2
1.2 Uniform System Interface.....3

University of Michigan Page 1 May 01, 1968

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THE DATA CONCENTRATOR

1.3 Operational Features.....4
1.4 Economic Conisderations.....6
II. EQUIPMENT DESCRIPTION.....8
2.1 Data Multiplexor and Clock Generators.....9
2.2 System/360 Interface.....11
2.3 Line Adapter Scan Controls.....13
2.4 Line Adapters.....17
2.4.1 Start/Stop Line Adapter.....20
2.4.2 Serial-Synchronous Line Adapter.....21
2.4 3 Special-Purpose Line Adapters.....23
Auxiliary Equipment.....24
III. MESSAGE TRANSMISSION CHARACTERISTICS.....25
3.1 Code Translation and Interpretation.....27
3.2 Message Processing.....33
3.2.1 Ending Conditions.....36
3.2.2 Record Acknowledgment.....38
3.2.3 Stop Conditions....39
IV. DEVICE MANAGEMENT.....43
4.1 Service Attributes.....44
4.2 Device Allocation.....50
4.3 Terminal Identification.....52
4.4 Device Characteristics.....52
4.4.1 System/360 Interface.....53
4.4.2 AT& Models 33/35 Teletypewriters.....60
4.4.3 IBM Model 2741 Typewriter Terminal....69

TABLE OF CONTENTS

V. COMMAND LANGUAGE OPERATIONS.....75
5.1 Command Messages.....76
5.2 The Mater Console.....80
5.3 The Password Console.....80
5.4 Command Descriptions.....81
5.5 MTS Command Descriptio...