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One of the typical applications where the TD230 can display all its technical advantages is in an exchange Telecom Cards protection. Sometimes fifty cards or more are to be supplied with the same power supply (+/-5V, 1kW), and a decentralized protection is needed because one card may be faulty, but should not penalize the others with un- adapted protection system. The risk of complete breakdown of the system must be eradicated. In this application the two above described over current causes (external line perturbation or inter- nal componentfault) are likely to happen.ln the first case,the current limitation on each card will ensure undammagingon-board conditions,and in the sec- ond case, the faulty card will be disjoncted from the power supply until reset. Figure 8 shows a typicaltelecom application with decentralized protection. In this application, the positive power supply serves the logic control and analog signals whereas the negative power supply is dedicated to the analog.