GEC pulls glass into cables

A fibre-optic cable being pulled through 625 m of Post Office duct along the A13 road. Over the next few months, the cable will be tested in various environmental conditions: the duct will flood when it rains. The colour-coded fibres used were from a 30 km batch made at the GEC Hirst Research Centre. 50% of the fibres showed losses of less than 4 dB/km, and the remainder were under 7 dB/km