Summary

This 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.