Bog reel: Welsh company puts cables in the sewer

As the ground below city streets becomes ever more congested with cables of all types, it's getting more and more difficult for network companies to find new pathways. Now, H2O Networks of North Wales has come up with a cost-effective way of laying fibre through the nation's sewerage system.

Using the sewers, organisations can set up their IT and telecoms networks with virtually unlimited bandwidth. H2O's Focus (fibre optical underground sewer system) system "is a fast and cost-effective way to lay cable and link up any location without the high costs and disruption caused by traditional cabling methods", the company said last week.

There is great demand to find new ways to lay the vast amount of cable needed to satisfy the massive and continuing expansion of telecommunications networks and the internet. Sewers offer readymade channels for cable to follow but there are some practical difficulties.

Sewers are built in such a way that the channel is clear enough to allow the effluent to flow freely, so cables must be laid so that they don't hamper this. The cables also need to be robust enough to be able to sit unattached in the sewer and remain resistant to ebbs and flows and the actions of the sewers' main residents: rats.

H20 has solved the practical difficulties, according to managing director, Elfed Thomas. He told silicon.com sister site ZDNet UK: "We have had to convince all the water companies that our system can be laid in the sewer without damaging the sewers or blocking them."

According to Thomas, the cabling system used by H2O is easy to lay in the sewers, entirely resistant to rats and other sewer inhabitants, and very cost-effective to lay. "It costs around £3.50 a metre," he said.

The low costs makes the system "ideal as a bespoke solution for a separate secure network or for disaster recovery," said Thomas. But most importantly, according to Thomas, the network is available for a fixed cost rather than a charge based on bandwidth.

He said: "Between seven and 15 per cent of the cable will have to be laid using more conventional methods." The majority is just pulled through the sewer, which is where much of the savings come. Using the H2O method, a cable can be laid up to 80 per cent faster than using traditional methods, the company said.

H2O is attracting a lot of interest from all over but especially from universities, Thomas said. He was, however, reluctant to name them: "The universities can see the benefit and we have four deploying it but they don't want to say anything just yet. They want to make a bit of a splash about it."

H20 has three solutions: Darc provides a low-cost rental of fibre cores and offers flexible terms and unlimited capacity; Darc Reserve is for organisations which have existing networks but need to call upon extra capacity from time to time or in case of a disaster; and xtreme is designed specifically for disaster recovery - the high-security cable can be connected in to buildings ready for use in an emergency.

Colin Barker writes for ZDNet UK