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Satety of telecommunication equipment and systems are going to become internationally standardized. Because of the far reaching interconnections via telecommunication networks, safety is a most important factor in designing and constructing telecommunication equipment and systems. In the past safety standardisation of telecommunication was a national task mostly adressed by the telecom administrations...
Point of view of safety authority which is responsible of the safe use of electricity in Finland, about the international safety requirements for telecommunication equipment.
Methods used to evaluate reliability and availability performance of telecom power systems are described. The models are based on Markov chains in steady-state conditions assuming expotential distributions. The models and methods normally used have been developed further in order to obtain more numerical information on the effects of monitoring systems and operating practices of maintenance staff...
Field reliability data are described with references to 48V/60V 300A power plants, developed by ITALTEL according to specifications of SIP, Italian Telecommunication Operating Company. Each power plant consists of a power distribution system, 60A rectifiers and 25A buck-boost converters, redundant parallel operating with load sharing and selective cut-off of failed unit. The period under examination...
An increasing variety of UPS allowing of various configurations and connections are being offered on the market. The main reason for installing UPS is to ensure reliability of supply and it is therefore necessary to judge and compare the reliability of various configurations. This paper defines the basic UPS configurations and develops expressions for the resultant system reliability. We consider...
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