Several Point System devices have Fault variables, which are blanket indicators that consolidate several other MIB variables for the device. Consider it a quick “thumbs-up/thumbs-down” check for the device. So, for example, instead of checking Fiber Link and Copper Link, one could just check Fault.
Because not all Point System devices have the same error indications available, the precise meaning of Fault varies slightly from model to model. Fault is always an indication that the converter has detected a condition that will prevent it from passing traffic. Look at the other MIB variables for this device for details.