This type of duct was recently installed to serve a small hamlet in Sussex, see photo:
Can anyone point me to a site that describes the various fibre cables that BT uses and, if not, any information on this one and the 6 - 8mm(?) overhead stuff would be welcome. As for instance, what is the maximum number of fibres per cable, bandwidth, how many million simultaneous HDTV programmes can our 18 house hamlet view or phonecalls make (OK, that last not serious!) & so on?