Each BSC cabinet must be configured with a power distribution box, which is installed at the top of the BSC cabinet.
The BSC-high power distribution box provides lightning protection and overcurrent protection for four -48 V inputs, which are then divided into two groups to supply power to the functional modules in the BSC. (Each group has three -48 V outputs and three RTN outputs.) The power distribution box also detects the input voltage and the output power, and generates audible and visual alarms when faults occur.