The dc power to the rack normally enters the sub-rack via the DC Input Card (Part Number 05701-A-0325). This power may be supplied by the user from an external nominal 24V dc supply. The dc supply is routed through the Engineering Card and sub-rack back plane to all cards in the rack and is protected by a fuse on the DC Input Card. There is a two part terminal block, TB1, to aid removal of the card without disconnecting each of the connected wires. If required, a stand-by backup battery supply may also be connected to the auxiliary dc input connections. The PSU and AUX connections are isolated from each other by diodes. The DC Input Card also provides RFI filtering and reverse polarity protection.
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