Browse Prior Art Database

Multi-Control Units Interface to Original Equipment Manufacturing Interface Channels

IP.com Disclosure Number: IPCOM000116629D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Chen, SD: AUTHOR [+3]

Abstract

A clustered topology design of the channel TAG/BUS lines is presented as a short transmission line stub to give a single control unit equivalent of electrical interface to the Original Equipment Manufacturing Interface (OEMI) channels.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Multi-Control Units Interface to Original Equipment Manufacturing
Interface Channels

      A clustered topology design of the channel TAG/BUS lines is
presented as a short transmission line stub to give a single control
unit equivalent of electrical interface to the Original Equipment
Manufacturing Interface (OEMI) channels.

      In attaching one control unit interface to a set of OEMI
channels, daisy-chained with cables from one control unit box to the
next with tag-ins connected to tag-outs and bus-ins connected to
bus-outs.  To enhance the connectivity as well as the reliability of
he subsystem, two independent controllers can be attached to a single
channel in a single box to achieve the dual paths.  While attaining
the goal of redundancy, it also creates a problem, at each daisy
chain location, two transmission line stubs are created at a single
OEMI interface slot.

      The control unit card is then modified to dock directly with
the tailgate card thus eliminating any additional cablings needed.

Furthermore, channel interface signals are now clustered around their
associated channel connectors.  The longest net is now around 12
inches instead of the 17 inches for the standard vertical design - a
30% savings!  Wiring channels are also suddenly opened up.  The front
and back layers can be free of any wiring traces!  Most of all, this
new design passes the all electrical specification as demanded by the
OEMI specification.