초록 ▼

An auxiliary connector circuit is used within an electronic system (10) which comprises a plurality of removable circuit cards (14, 16, 18, 20, 22, 24, 26) which are mounted within a cabinet (12). Before the circuit card (16) is removed from the cabinet (12), a power cable (44) is connected by means

An auxiliary connector circuit is used within an electronic system (10) which comprises a plurality of removable circuit cards (14, 16, 18, 20, 22, 24, 26) which are mounted within a cabinet (12). Before the circuit card (16) is removed from the cabinet (12), a power cable (44) is connected by means of engaging a plug (46) to a socket (34). When this occurs a DATA OUT ENABLE signal at a line (65) drives three-state devices (86, 88, 90, 92, 94, 96, 98 and 100) to a high impedance state to isolate a memory array (78) from a data bus (102). This high impedance prevents any transients from being transmitted through the data bus (102) when the card (16) is removed from the cabinet (12). After the card (16) is removed from the cabinet (12), the power cable (44) can be disconnected from the card (16) or the card (16) can be tested to evaluate the components mounted on the card (16).

대표청구항 ▼

An auxiliary connector circuit for an electronic system having a power supply, at least one removable circuit card and a communication channel connection between the circuit card and another part of the system, comprising: a power cable connected to said power supply, means for removably connecting

An auxiliary connector circuit for an electronic system having a power supply, at least one removable circuit card and a communication channel connection between the circuit card and another part of the system, comprising: a power cable connected to said power supply, means for removably connecting said power cable to said circuit card for providing power to said circuit card, means on said circuit card for producing a control signal when said power cable is connected to said circuit card, and means responsive to said control signal for opening said communication channel to prevent electrical transmission through said communication channel between said circuit card and the remainder of said system.