What happens in the event of a Central Processing Unit (CPU) failure?
Remember, all decisions to unlock doors are made at the individual cardreader controllers. If the CPU fails, all guests currently staying at the hotel (and all employees) will still be able to enter and exit their assigned rooms and common doors. However, a new guest checking into the hotel would not be able to have his/her credit card assigned as their room key. Instead, the front desk clerk would issue the guest a pre-encoded house card that would unlock their assigned room and common doors only.
