| 摘要 |
A communications cable network, in a duct or tube system used primarily for other purposes, wherein the communications cables are mounted on the walls of the duct or tube system. The communications cable (3), is made of a core (7-10) and a sheath (11). The core (7-10) of the communications cable (3) is extremely flexible and the sheath (11) is sufficiently rigid that cable sag is less than 20 mm for a 2000-mm distance between fastenings. The sheath (11) is removed from the core (7-10) in the area of the shafts (2) of the duct or pipe system (1).
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