Transmission path between nearby telephone central offices
AssigneeBell Telephone Laboratories, Incorporated
InventorsWendell Glenn Nutt, George Harry Webster
Life of this patent
Estimating the term…
Abstract
A multipair telephone cable especially designed to carry interoffice traffic consists of copper conductors insulated with expanded plastic with or without a solid plastic skin. The copper gauge size, insulation expansion factor and dielectric diameter are uniquely designed to consume a minimum of cable cross-section area while permitting use of the cable to provide voice frequency circuits in a manner comparable to normal; 24-gauge cable as well as to provide carrier frequency circuits operating in the range of from about 100 kHz to 8.0 MHz comparably to normal 22-gauge cable. The cable includes pairs twisted according to a constant twist frequency spacing concept.
Claims10
A telecommunication multipair cable comprising:
- one or more units each comprising a plurality of insulated conductors arranged in twisted pairs, each conductor consisting of a copper wire having an insulative dielectric layer comprising a first polyolefin coat expanded with an inert gas, and thereover, a second coat of high density polyethylene, with said first coat constituting the major fraction of the thickness of said dielectric layer, CHARACTERIZED IN THAT:
- a. each said copper wire has a diameter of from essentially 17 mils to 191/2 mils;
- b. the outside diameter of said dielectric layer is in a range of from approximately 31.7 mils to 35.5 mils;
- c. and wherein said first coat is expanded by an amount ranging from 20 percent to 60 percent.
A telecommunications multipair cable comprising one or more units each comprising a plurality of insulated conductors twisted in pairs, each conductor comprising a copper wire having an insulative dielectric layer of polyolefin expanded with an inert gas, CHARACTERIZED IN THAT:
- a. each said copper wire has a diameter of from substantially 17 mils to 191/2 mils;
- b. the outside diameter of said dielectric layer is in a range of from approximately 31.7 mils to 35.5 mils;
- and
- c. the dielectric layer is expanded by an amount ranging from 20 percent to 60 percent.
Dependencies are inferred from the claim text.