Long-Line Public Address (LLPA) system at Docklands Light Railway
The Docklands Light Railway (DLR) needed a Long-Line Public Address (LLPA) system for their network. This network serves central and east London, including Lewisham, Tower Gateway, Bank, London City Airport, and Canary Wharf.
The Public Address and Voice Alarm (PAVA) system had to integrate with the existing signaling system and control centers. The system needed to provide automated train service announcements, travel messages, and emergency information. Managing 45 stations, many unmanned, required a reliable solution for DLR.
The Solution
Zenitel provided a fully integrated IP solution to create a Long Line Public Address (LLPA) system incorporating Voice Alarm functionality. The system amplifiers and mainframe provide highly efficient amplification combined with low whole life costs and exceptional reliability. Zenitel's adaptive Class-D technology and the iVENCS-based control system at the Operational Control Centres ideally meet the requirements of the large, modern rail network.
The features of the DLR solution, including loudspeaker line monitoring, audio routing, VOIP, Text-to-Speech, and DVA, are fully controllable via the iVENCS PA Control System. Zenitel's LLPA system facilitated multiple operators to manage the network simultaneously and provided instant fault reporting, easy management of automated train announcements, and the ability to select individual or multiple stations or PA zones for tailored live announcements. Two iVENCS workstations and associated servers were supplied to the Operational Control Centres, with an additional remote backup suite providing full dual redundancy.
The Result
Zenitel’s solution was a success, where the system continues to operate across the DLR network. Clear announcements at optimum broadcast levels have improved the experience of both passengers and local residents. Zenitel continue to provide DLR with public address and voice alarm solutions, where Zenitel equipment has been used for more recent upgrades to the system.
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