British Telecommunications Public Limited Company

British Telecommunications Corporation

British Telecommunications Public

Peter J Keeble

Peter L Frost

David M Spirit

Robert A Freeman

Andrew D Chaskell

John A Warren

Christopher J Rowe

Robert D Bailey

Fault management system for a telecommunications network

OTDR having optically switched amplified output onto test fibre to

An apparatus and method for introducing a transmission line into a duct through which it is to be propelled by viscous drag of fluid propellant. A high local flow of fluid is created by inputting fluid, preferably compressed air, adjacent the input of the transmission line to the duct and bleeding a proportion of the fluid from the duct a short distance along from the input. This local flow provides the driving force to progress the transmission line along the first third of the duct against the hydrostatic potential. The extent of the venting via the bleed valve is controllable to control the driving force on the transmission line. This technique is especially useful for transmission lines including optical fibres.

Optical fibre installation

Loss detection in a branched optical fiber

Control method and apparatus

Growing community of inventors

Ipswich, United Kingdom

Peter J Keeble