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Combining cable in duct and aerial for fiber deployments

Posted by Simon Roberts

Fiber DeploymentOperators normally aim to standardize on a single fiber deployment methodology to simplify installations and reduce time to market. However, sometimes it isn’t possible to take this approach as terrain and other factors are too varied for a one-size-fits-all solution.

When extending its Pan-African fiber network to Rwanda, this is exactly the issue that Liquid Telecom faced. Liquid is building Africa’s largest single fiber network, currently stretching over 18,000km across Uganda, Kenya, Rwanda, Zambia, Zimbabwe, Botswana, DRC, Lesotho and into South Africa. Customers benefit from fiber to the home (FTTH) speeds in excess of 100Mbps.

Diverse natural surroundings mean that the challenges of installing FTTH in the suburbs of capital Kigali and the surrounding countryside require very different solutions. To meet these needs, Liquid Telecom has pioneered a toolbox approach to deployment, combining cable in duct FTTH with a tree and branch aerial solution. This provides the ability to select the best network design on a case-by-case basis, while ensuring the integration of these designs into the overall network.

Spurring from its Pan-African backbone, Liquid aimed to deliver up to 100Mbps connection speeds to its Rwandan customers. As with any FTTH network, the key to success is being first to market, meaning that speed was of the essence, without any sacrifice on quality and performance. Furthermore, Liquid Telecom had to implement its fiber network via installers that were used to handling copper.

Miniflex Pushable Fiber Solution

Opening the toolbox

These three factors – toolbox approach, the need for speed and less fiber skilled staff  drove a demand for high-quality components that would allow straightforward installations, which would, in turn, deskill the installation process.

This led Liquid Telecom to expand its existing PPC Miniflex pushable fiber optic solution and introduce one of the lightest yet most flexible aerial cables on the market, combined with a prepopulated aerial dome, which had been tailored for Liquid’s network. The combination of lightweight, flexibility and pushable fiber enabled the local contractors to increase installation efficiency by up to five times.

Certain districts within Kigali did not support the application of cable in duct, or wayleave costs prohibited this design. At this point, Liquid Telecom turned its attention upwards and onto the existing lamp posts to design an aerial solution.

All Dielectric Self Supporting ADSS CableIt was imperative to have a cable that was lightweight so to avoid having to strengthen the existing posts otherwise, the business model was not scalable. This is a common problem that can be missed by operators and leads to deployment delays and budget overspends. By using the PPC All Dielectric Self Supporting (ADSS) cable, which weighs in at only 23kg per kilometer and will span 70m, Liquid could allow sufficient distance for the customer drop. Combined with an operational 10x bend radius, this sped up installations to maintain Liquid Telecom’s first-to-market advantage.

Often overlooked in aerial networks is ensuring a high-quality IP68 rated enclosure that is not only suited to the specific application but is cost effective. Liquid Telecom came to m2fx and asked the company to tailor its existing aerial dome to support up to two 1:8 splitters in a preconnectorized design. The requirement was lightweight, easy access to the joint and the ability to support pre-terminated aerial cable to further reduce the installation skill set and time. The redesigned PPC dome weighs in at just 2.4kg and can be installed by a single engineer, maximizing productivity and deployment speed.

By adopting a hybrid approach that uses the most relevant installation method for individual deployments, Liquid has been able to meet tight deployment timescales and tough business case targets while cabling Rwanda. Its success shows how a flexible, toolbox approach, combined with innovative technology can cost-effectively roll out fiber, whatever the terrain.

To read a full case study on Liquid’s successful Rwandan deployment click here.

Aerial cable installation eBook

Topics: Design and Install, Fiber to the home, Costs/ROI

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