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Note: Hard loopback tests are intrusive and will impact service. In a hard loopback, a special loopback plug is used in order to loop the traffic from the T1 port back into the T1 port. This figure illustrates the setup for hard loopback.
22.1 Introduction Fly-back converter is the most commonly used SMPS circuit for low output power applications where the output voltage needs to be isolated from the input main supply. The output power of fly-back type SMPS circuits may vary from few watts to less than 100 watts.he present lesson is limited to the study of fly-back circuit of single switch topology. 22.2 Basic Topology of Fly-Back Converter Fig.22.1 shows the basic topology of a fly-back circuit. Input to the circuit may be unregulated dc voltage derived from the utility ac supply after rectification and some filtering.