Importance

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Abstract

A circuit card is interfaced to a powered electrical bus by applying power to the circuit card before it interfaces to the electrical bus or by removing power from the circuit card after it has been removed from the bus. This is accomplished using a power cord that connects the equipment's power supply to a mating connector on the card to be inserted or removed. Attaching the power cord to the mating connector of the card disables the output drivers that provide output signals to the equipment's communication bus and places the card in a reset state. This prevents introducing error signals onto the communication bus. Additionally, the contacts on the edge connector are sequenced to prevent applying power to the circuit card before a ground is available. Additionally, the power cord and circuit card are keyed to prevent improper insertion and the power card includes an inductor to provide surge protection.

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First Claim