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Reliable Hot Plugging via Interlocked Connectors

IP.com Disclosure Number: IPCOM000108270D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 67K

Publishing Venue

IBM

Related People

Caricari, JA: AUTHOR [+3]

Abstract

Disclosed is a means of performing reliable "hot plugging" through interlocked connectors. This new connector arrangement (see the figure) will enable/disable current flow through the power plug via the sense plug. When installing a unit, the proper procedure is to connect the power plug first followed by the sense plug. Only after the sense plug has been connected is current able to flow through the power plug. This is a result of the enable circuit internal to the unit that is actuated by a jumper wire in the signal plug. When removing a unit, the sense plug is disconnected first, thereby stopping current flow through the power plug via the enable circuit, then the power plug is safely removed.

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Reliable Hot Plugging via Interlocked Connectors

       Disclosed is a means of performing reliable "hot
plugging" through interlocked connectors.  This new connector
arrangement (see the figure) will enable/disable current flow through
the power plug via the sense plug.  When installing a unit, the
proper procedure is to connect the power plug first followed by the
sense plug.  Only after the sense plug has been connected is current
able to flow through the power plug.  This is a result of the enable
circuit internal to the unit that is actuated by a jumper wire in the
signal plug.  When removing a unit, the sense plug is disconnected
first, thereby stopping current flow through the power plug via the
enable circuit, then the power plug is safely removed.  Since no
current is flowing through the input power plug during insertion of
removal, damage to the connector pins will not occur as a result of
arching.  To insure proper plugging procedure, a power plug removal
inhibitor has been incorporated into the sense plug. This prevents
the power plug from being removed while the sense plug is in place,
and will also prevent the power plug from being installed after the
sense plug.

      The cost of implementing the function in this fashion is
extremely low.  The modification to the signal connector to
incorporate the power plug removal shield is minimal and should add
little to no cost to the connector after tooling is completed.  Other
attractive aspects of...