The Brainstorm Electronics PS-7 is a 12V DC External Power Supply for SR-28 Time Code (LTC) Distributor/Reshaper (sold separately). The SR-28 has 2 power inputs and allows for 2 separate power supplies to be connected simultaneously. If one of the supplies fails, the second one will keep the SR-28 running. The LED corresponding to the faulty supply will start blinking to alert you. You can then replace it without having to power down.
Note: For better failure protection, the 2 power supplies should be on separate mains circuits.