Wave Fully managed, high quality end-to-end transparent data transmission service operating at speeds of up to several 100G’s. Private Wave Secure, flexible and high performance private optical networking built on customer-dedicated WDM equipment and fibre infrastructure. Spectrum Providing ultra high bandwidth connectivity, Colt Spectrum delivers the flexibility and control of a long haul fibre network, without the overheads of Dark Fibre. Dark Fibre Colt’s dark fibre network is the most extensive and reliable in Europe. We cover 47 metropolitan areas which are interconnected by our 38,000km network.