00 N < the University of Michigan the Data Concentrator

This report describes a prograimiable 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 PDH-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 othe~ 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 .