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Fault Isolation on a Multidriver Bus

IP.com Disclosure Number: IPCOM000041386D
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Schettl, MD [+details]

Abstract

Fault isolation in a typical multidriver bus configuration is a manual operation and, therefore, time consuming. It is also prone to replacing the wrong component(s) until the failure is isolated and, therefore, a costly operation. Three typical configurations are shown in Figs. 1, 2, and 3. Generally, the bus is bidirectional (BiDi), each node contains a driver and a receiver, and one node has control of the bus at any one instant in time. Fig. 1 is a typical I/O channel, and the channel control logic has control of the bus. Commands and data are transmitted over the bus to and from the I/O device controllers. In most systems, each node on the bus is a Field Replaceable Unit (FRU). Fig. 2 is a similar configuration except that all of the nodes are on one FRU. Fig. 3 is a combination of Figs.