THE EVOLUTION OF SHEATH CONSTRUCTIONS FOR COMMUNICATIONS CABLES

Abstract : Sheath constructions for multi-pair line communications cable, as developed in England, Germany and in the United States, are reviewed. It is concluded from the service experience reported that 'bonded jackets,' in which a metal tape shield is bonded to a plastic jacket, are equally suitable for paper and plastic-insulated cables. A theory of permeation through 'bonded jackets' is developed and reasons for discrepancies between theory and practice are discussed. Various aspects of the manufacture and splicing of 'bonded jacket' cable are considered. Experience in the fabrication of plastic/metal laminates over the past three years is given. The future of 'bonded jacket' cables also is discussed. (Author)