Patent ID: 7397990

Claim:
A signal transmitting cable for installation into a tube by means of blowing by compressed fluid, the cable comprising a first signal transmitting portion including a plurality of elongate, flexible first optical signal transmitting members, wherein the first optical signal transmitting members of the first signal transmitting portion are surrounded by a first layer of resin material curable by means of radiation such that only the outermost optical signal transmitting members are in contact with said first layer, and said first optical signal transmitting members are arranged to form at least three rows, wherein for each said row containing a plurality of said members, said members are arranged such that neighbouring members of said row are in touching contact with each other, each recess formed by neighbouring members of a first said row facing towards a second said row accommodates a respective member of said second row, said first layer is in touching contact with substantially all of the outward facing surface of the first signal transmitting portion, and wherein a material forming an outer surface of the cable is modified to facilitate installation into a duct by means of fluid flow.