Browse Prior Art Database

Channel Tap Unit

IP.com Disclosure Number: IPCOM000107342D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Carey, JJ: AUTHOR [+3]

Abstract

This article describes a device that is used in-line with the standard IBM System 370* channel cable to permit a convenient method for control unit access to the channel. The channel tap unit provides the electrical connection to the channel signals as well as translation to a more manageable secondary transmission system without losing electrical integrity. The secondary system interface uses two 78-pin miniature "d"-shell-type connectors rather than the four large serpentine connectors that are commonly used on the channel.

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This is the abbreviated version, containing approximately 59% of the total text.

Channel Tap Unit

       This article describes a device that is used in-line with
the standard IBM System 370* channel cable to permit a convenient
method for control unit access to the channel. The channel tap unit
provides the electrical connection to the channel signals as well as
translation to a more manageable secondary transmission system
without losing electrical integrity.  The secondary system interface
uses two 78-pin miniature "d"-shell-type connectors rather than the
four large serpentine connectors that are commonly used on the
channel.

      The channel tap unit consists of a printed circuit board, four
sepentine connectors, two 78-pin "d" connectors and a case.  The 2S,
glass-epoxy, circuit board with a ground plane provides the physical
mounting surface for the components as well as being the conduction
path for the signals.  The printed circuit board wiring is an
excellent match for the 95 ohm impedance required by the channel
signal wiring.  The two serpentine connectors coming from the
channel, designated bus-in and tag-in are wired to one 78-pin
connector which becomes channel-in.  The other two serpentines that
are normally designated bus-out and tab-out are similarly wired to
the other 78-pin connector to become channel out.  The wiring on the
board for channel- in is a mirror image of the wiring for
channel-out; therefore, the channel tap unit appears to the channel
cable system to be nothing more than a short jumper section of cable
...