Power System in Telecommunication Power System is one of the main sectors in a telecom organization. Input power of Telecom equipment may be: DC 24/-48/ 60 V In GP, we use -48 V in most of the cases. So our job is: 1.To ensure constant DC power for the equipment, 2.To ensure distortion less, surge protected, safe AC input power. Why DC and not AC Power Supply? Rectifier: DC Power Source DC power plant that converts alternating current to direct current is called rectifier  There are actually two types of rectifier system a. Thyristor controlled rectifier b. Switch mode rectifier  For telecom equipment it is mostly recommended to use SMPS based rectifier or Switch mode rectifier. The basic principle of Thyristor and SMPS rectifier are 1. In Thyristor controlled 220V AC supply is directly fed to a step down transformer as per required (say 220V AC to 48V AC) than the bridge diode and capacitor is used for DC and filtering and in SMPS system 220V AC sup......

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