SummaryThis Recommendation deals with planning and constructing telecommunication cable lines. It gives information about: – the usefulness of a metallic screen in cases where noise interference may arise (e.g. in the vicinity of electrified railway lines, especially when thyristor controlled equipment is installed on locomotives); – types of cables that should contain a metallic screen; – properties of such screens; – calculation of the screening factor; – parameters affecting the screening factor (e.g. insulation of the outer covering, length of the cable); – measuring the cable parameters. Reference is made to the Directives, Vol. IX and the manual The Protection of Telecommunication Lines and Equipment against Lightning Discharges, 1974, 1978. |