Kordia goes underground and comes up with happy customers
The Sydney Airport underground railway line was in need of a mobile coverage upgrade. The original distributed antenna system (DAS) technology used by Australian mobile carriers had to be replaced to accommodate the latest frequency channels and come up with improved coverage that Sydney rail commuters required.
The Airport Link Company (ALC) operates the underground railway line at Green Square, Mascot, Airport Domestic and Airport International Train Stations along the 9 kilometre track. This tunnel links Sydney Airports with Central Station, the Sydney Central Business District and 300 train stations in Greater Sydney and beyond. Rail commuters now more than ever require seamless mobile coverage wherever they are.
Kordia were engaged by Telstra to upgrade the DAS covering the tunnels and stations. The objective was to cover all frequency ranges for three mobile phone carriers with an Andrews Ion-M active system and fibre fed remotes. The Kordia scope was to build, project manage and integrate the new system. A key requirement was to retain existing mobile phone services throughout the build then fully cut over, decommission, and remove the superseded equipment.
The DAS technical installation works were staged to provide an overlap of the new system with the old system as to not affect the mobile phone customer experience of rail commuters. A temporary solution was devised and installed that fed both active systems host units, from each of the carriers’ base stations for continuous coverage to work before the new system had sufficient coverage in operation.
The upgrade resulted in:
Expanded coverage and capacity from 3 antenna sectors to 6 antenna sectors.
Replacement of 29 optical repeater locations and all of the antennas within the tunnel.
Installation of a new repeater locations and antenna.
Each of the 4 stations received a complete new DAS as part of the upgrade including refurbishment of the base station room power and air conditioning.
Telstra were very happy with Kordia’s delivery and performance of the new DAS for their customers.
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