초록 ▼

In order to install an optical fiber cable 110 in a duct 112 a plurality of vents 130, 132, 134 spaced apart along the duct are operated such that during blowing any vent 130 upstream of the leading end 138 of the cable is closed and when there is at least one vent 132, 134 downstream of the cable l

In order to install an optical fiber cable 110 in a duct 112 a plurality of vents 130, 132, 134 spaced apart along the duct are operated such that during blowing any vent 130 upstream of the leading end 138 of the cable is closed and when there is at least one vent 132, 134 downstream of the cable leading end at least the downstream vent 132 closest to the cable leading end is open for venting gas from the duct. In this way the pressure decay and pressure gradient profiles are modified during installation to improve installation performance.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of installing a cable in a duct, wherein a plurality of venting means are spaced apart along a length of the duct, comprising:providing the cable;blowing the cable into the duct using a gaseous flow which is fed into one end of the duct together with the cable;

[ What is claimed is:] [1.]1. A method of installing a cable in a duct, wherein a plurality of venting means are spaced apart along a length of the duct, comprising:providing the cable;blowing the cable into the duct using a gaseous flow which is fed into one end of the duct together with the cable; andoperating the plurality of venting means such that during blowing, when one or more of the plurality of venting means is upstream of a leading end of the cable, each of the one or more upstream venting means is closed and, when one or more of the plurality of venting means is downstream of the leading end of the cable, at least a downstream venting means closest to the leading end of the cable is open for venting gas from the duct.