Bell System Technical Journal · 1928 · 12 citations · 0 references
EngineeringElectrical EngineeringOcean EngineeringMarine Electrical SystemsOcean InstrumentationSubsea EngineeringElectrical InstallationSubsea InstallationSubsea InstrumentationCable System DesignCable SystemsSignalsSubsea Cable InstallationSubsea Cable OperationsSubsea Power CablesTraffic CapacityUnderwater Electrical Transmission
Permalloy-loaded submarine cables have enabled transoceanic lines with many times the capacity of earlier non‑loaded cables, and this paper reviews prior work from Bell Laboratories. The paper surveys the history of permalloy-loaded cable development, examines outstanding design, construction, and operational problems, and evaluates their overall usefulness. The study is organized into subsections covering current service status, historical remarks, permalloy application, design and operational principles, signal restoration and automation apparatus, electrical measurements, and a concluding general survey.
The invention of permalloy and its application to submarine cables have led to the installation of transoceanic cables of many times the traffic-carrying capacity of the former non-loaded cables. This paper relates briefly the history of the development of permalloy-loaded cables and discusses certain outstanding problems concerned with their design, construction and operation. In a concluding general survey the field of usefulness of loaded submarine telegraph cables is considered. To a considerable extent the paper is a critical summary of material previously published by members of the staff of the Bell Telephone Laboratories. Its scope is indicated by the sub-titles as follows: Loaded Cables Now in Service Historical Remarks Permalloy and Its Application to Cables Principles of Design of Loaded Cables Principles Involved in Operation Apparatus for Restoration of Signals Apparatus for Automatic Operation Electrical Measurements of Loaded Cables A General Survey