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For some years the advantages and disadvantages of using centralized or decentralized power systems for telecom equipment have been discussed. The major topic has been the philosophy for powering the switching equipment. The question has been whether a large centralized DC power system or a decentralized rectifier system with a common battery bank, or a fully decentralized power system integrated...
Information is given of a proposal for technical requirements of electrical and functional safety of equipment connected to the mains supply as well as to an administrations network. Such requirements have to be agreed upon in order to reduce the risks for hazardous voltage, current or frequency being transferred to the telecom network, there being able to cause human injury and equipment or operational...
The telephone switching offices in Sweden range from very large city exchanges down to small units in sparsely populated areas. There is an ongoing effort to increase the number of exchanges being operated unmanned and to reduce the amount of visits to the stations for operation and maintenance work e.g. at the power supply installation. This paper will show how these needs can be fulfilled by using...
The charging methods for stationary accumulators for use in telecommunication installations have changed through out the years. The reason for this is not only the development and the achievements in the battery technology field and the new methods and components in the control area but also the better knowledge of demands and result of the operation and maintenance work in the field. From the administrations...
The Swedish Telecommunications Administration - known in Sweden as Televerket - has one of the oldest telephone networks in the world. Advanced product development has enabled very high reliability values to be attained. It has therefore been possible to maintain costs and rates' at a low level. Changeover to digital technique will take place at an accelerated pace by replacement of older equipment...
The Swedish Telecommunications Administration, Televerket, is a state-owned public utility and - running as a monopoly - it is responsible for installation, ownership and operation of telephone, telex, data and radio communication in Sweden. After more than 100 years existence the telephone network in Sweden now offers fully automatic dialling for every subscriber and the country has the second highest...
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