Auxiliary power connector and communication channel control circuit

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