Communications: electrical – Systems – With specific power supply
Patent
1984-06-20
1987-11-03
Caldwell, Sr., John W.
Communications: electrical
Systems
With specific power supply
307140, 307149, 361119, 361413, G08B 100
Patent
active
047045990
ABSTRACT:
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).
REFERENCES:
patent: 3691399 (1972-09-01), Vinch et al.
patent: 4151580 (1979-04-01), Struger et al.
patent: 4356550 (1982-10-01), Katzman et al.
patent: 4609829 (1986-09-01), Milby et al.
Dozier Harold W.
Kimmel Arthur T.
Caldwell Sr. John W.
Olson David W.
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