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Facilitating broadband

Deployment Standards

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Video footage of the Chorus pilot Broadband

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print this page [ Last Updated 14 March 2011 ]

Facilitating broadband Deployment Standards


Deployment Standards Initiative (DSI) Fibre deployment trial In December 2010, the Deployment Standards Initiative project selected Telecom’s network arm, Chorus, to undertake a micro-trenching and minitrenching pilot trial as part of their research.


The trial was conducted in urban streets in Kelson, Lower Hutt, Wellington in January and February of this year. The results and learnings from the trial will assist with understanding of alternative fibre deployment techniques, in preparation for the Ultra-Fast Broadband and Rural Broadband Initiative network deployments. Working in partnership with Marais-Lucas Technologies and Downer NZ, Chorus used the latest technology to lay fibre optic ducting and cable along roads, footpaths and grass berms. Site visits provided an opportunity for councils, utilities, road controlling authorities and telecommunications companies to see these micro trenching and mini trenching techniques being deployed in practice. Road engineers and a wide range of broadband stakeholders from Auckland to Christchurch have visited the pilot site and inspected the installation. View the Ground Penetrating Radar (GPR) video. The installations commenced with the use of ground penetrating radar (GPR) to identify the location and depth of existing utility infrastructure (eg gas pipes and water mains) buried in the road corridor. This was combined with records for the location of existing infrastructure to provide reliable information on the exact physical position of this infrastructure in the ground. GPR can identify the cover to services to within 2-3 mm accuracy. View the Mini and Micro-Trenching video. The Marais-Lucas machine used in the carriageway was a specially designed vehicle, brought in from Australia, that enabled the micro-ducting for fibre optic cable to be laid in a narrow trench – between 80 mm and 130 mm wide and 430 mm deep. The “CleanFast” equipment uses a cutting wheel with rock cutting teeth on the back of the truck with simultaneous suction and storage of excavated material. This material is regularly disposed of to a skip. After laying the (approximately) 40mm diameter cable, the trench was backfilled with a specially designed rapid set mortar. Up to 500 metres per day can potentially be installed using this technology. View the Sidecut Footpath Machine video. The vehicle on the footpath was a smaller version 900 mm wide – known as a the “SideCut” machine, cutting a trench 50 mm wide and 200 mm deep, and placing the excavated material alongside the trench. The machine can cut a trench at a rate of 70 to 100 metres per hour and successfully cut through a concrete footpath. The trial successfully met its objectives and key learnings obtained from the trial will be shared in the near future. Back to Top

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03/2011 (NEW ZELAND): Deployment Standards Initiative (DSI) Fibre deployment trial