Electrical transmission or interconnection systems – Plural supply circuits or sources – Connecting or disconnecting
Patent
1996-06-10
1998-04-14
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Connecting or disconnecting
307 80, 307 86, 307140, 307 66, 370402, 370465, 365226, 364492, 3642735, H04L 1240
Patent
active
057395977
ABSTRACT:
A communications adapter card includes a circuit arrangement for causing an electrical voltage to be supplied to the card from a first voltage source, even if a second voltage source is available, and from the second voltage source if the first voltage source is not available. The circuit arrangement includes a Field Effect Transistor (FET) with its gate electrode connected to a control circuit which puts the FET in an off-state to inhibit the second voltage source from supplying voltage to the card if the first voltage source is available, and puts the FET in an on-state to supply voltage to the card if the first voltage source is not available. The invention makes it possible for a single communications adapter card to be used to attache power managed and non-power managed personal computers (PCs) to a Local Area Network (LAN).
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Bailey Warren D.
Najm Elie M.
Wells Robin C.
Cockburn Joscelyn G.
Gaujian Peter
International Business Machines - Corporation
Shoop Jr. William M.
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