If the BF device is duplicated, System A initiates its own
BF device and System B initiates its own BF device. If a
nonredundant BF device is used, the initiate signals from both
System A and System B are routed to the same BF device.
This calls for careful engineering of the dc circuits in order to
ensure independence and separation of the two battery systems
as required. The issue of separation of the dc circuits is
alleviated if the initiate signals are provided via digital peerto-
peer communication over fiber.