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Structuring IBM System/370 Channels

IP.com Disclosure Number: IPCOM000068460D
Original Publication Date: 1978-Jan-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Davis, MI [+details]

Abstract

A single entity is described which fulfills the requirements for structuring channels. These requirements previously dictated the need for five separate and distinct units. A subchannel is a group of hardware facilities with the capability to control one input/output (I/O) device. A selector channel has a single subchannel and can run only one device at a time. A multiplexer channel has multiple subchannels and can run multiple devices in overlap. The block diagram of a typical selector channel is shown in Fig. 1. The block diagram of a typical multiplexer channel is shown in Fig. 2.