Methods and associated hub arrangements are described for use in diagnosis and recovery in high performance digital loops such as, for example, those seen in Fiber Channel systems. With a tall growth habit, profuse, deep violet flowers and continuous summer flowering. The PFC controller may comprise a processing unit comprising a processor and a memory having firmware stored thereon which, when executed by the processor, causes the processor to compute an input current set point for the AC-to-DC power supply based on the output voltage of the AC-to-DC power supply. The chemical oxide removal may be performed in a vapor containing HF and NH3 or a plasma containing HF and NH3. Auto-detection of additional parts and test cases enables validity checking of the requirement to test case tree and reports are generated.