Optocore Adds More Rings to the London Olympics

Norwest/Delta Sound set up large stadium PA/broadcast fibre transmission for Opening/Closing Ceremonies

The awe-inspiring — and completely distinctive — Opening and Closing Ceremonies, which spectacularly book-ended the London 2012 Olympics, was a triumph for the respective artistic directors, Danny Boyle and Kim Gavin.

Described as the most creative yet, to ensure the realisation of these ambitious concepts, the sound and lighting designers were also faced with enormous technical challenges.

Specialising in this scale of event production for more than a decade, Australian company Norwest Productions again teamed up with their UK partners Delta Sound to provide the necessary Optocore fibre signal transport, custom RF solutions and LAN networking. This sophisticated connectivity realised the sound design conceived by fellow Australian Scott Willsallen (of Auditoria) — another with a string of Games Opening/Closing events on his CV — in conjunction with theatre sound designer, Bobby Aitken.


Norwest’s project manager, Andy Marsh, knew that the network system required for a new 80,000-capacity Olympic Stadium would present challenges. “We needed to overcome difficult cable runs,” he said. “The cable installation took us in excess of three weeks and was more akin to installing cable permanently into a venue. On top of this, the inclusion of many fully live musical acts — adding further size and complexity to the Optocore and backup systems — placed a considerable load on all the experienced audio engineers involved.”


Optocore has long been at the heart of Norwest’s main digital systems — and more than 50 devices were deployed in an inventory shared with Delta Sound.

Since the specification had called for all Optocore ‘R’ series devices, Norwest purchased a number of these new energy-efficient converters to accommodate the design’s high channel and node count. They added quantities of DD4MR-FX, DD32R-FX, X6R-FX-8AE/8MI, X6R-TP-8AE/8MI, X6P-16IN devices to their inventory — these offer increased features and efficiency, reduced carbon footprint, power consumption (of 40%) and cost. Delta Sound also purchased a quantity of DD4MR-FX, DD2FR-FX, and X6R-FX devices for the event.

“Optocore is unique in its ability to matrix a high channel count over large distances, plus providing the redundancy of a ring network,” states Marsh. “Most significantly, it is extraordinarily robust and reliable, which is essential to a show that is playing to 80,000 people live in the arena and four billion watching on TV.”

The integration necessary to meet Auditoria’s detailed and dual-redundant design involved deploying multiple Optocore fibre networks, with full analogue back-up, principally for the main PA and Broadcast systems.


The main 24-node ring collected and distributed all inputs and outputs on a 2Gbit network to a myriad of broadcast and PA locations, and Optocore also delivered both PA and monitor feeds, plus timecode and programme. In total there were 696 I/O channel feeds within the Optocore topography.

This was one of the first uses of the German company’s new 2.21 protocol, which enabled 2Gbit bandwidth operation — and was crucial to meet the main requirement of a high channel count. Another unique feature of the set-up was that Norwest were using all 24 ID’s — taking advantage of the maximum capacity of the fibre ring. They also used a quantity of Optocore’s TP devices, which provided a Cat5 extension of the ring.

Olympic Games Opening Ceremony - Bobby Aitken (sound designer) and Scott Willsallen (Auditoria)


With multi-mode distances of up to 350m between nodes, and single-mode distances running anything up to 1000m between nodes, the scale of the complete fibre network was in excess of 5km (with Dolby Lake processors providing the main system switchover between networks).

The broadcast ring, meanwhile, tied the main system to the Delta Media truck for all necessary I/O. Delta Media delivered downstream mixes of playback, live and atmos mics to both CTV and OBS for their broadcast of the ceremony.

In the transmission path, all signals were converted to digital on entering the Optocore environment, while the back-up system ran analogue from the DiGiCo console SD rack outputs. The feeds were delivered via AES to a massive FOH PA comprising entirely L-Acoustics components, with 220 VDosc, 100 Kudo, 55 Arcs, 88 SB28 subs and some 12XT fills — all driven from LA8 amplifiers.

In summary, Andrew Marsh can reflect on a highly successful implementation in which Norwest confronted numerous challenges along the way — including the siting of some of the equipment. But then again these were unique shows.


The Opening Ceremony was described as “madcap, surreal and moving” — evolving historically from green rural life via the belching chimney stacks of the Industrial Revolution to the internet age. The second was billed as ‘A Symphony Of British Music’ and tipped as 'the best after-show party that's ever been’, featuring 4,000 artistes, with cameos by The Spice Girls (performing on top of black London taxis, travelling around the athletics track) and Monty Python’s Eric Idle providing some of the more memorable moments.

Marsh credits his own crew, and in particular Justin Arthur (Optocore & Patch Engineer), as well as the Delta Sound crew, led by overall project manager Steve Lutley, plus Senior Systems Engineer from Autograph, Rob Tory.

“We all worked seamlessly together to make this a huge success, and the relationship between us could not have been better.”

About Optocore
Based in Munich, Germany, OPTOCORE is the world market leading provider of high bandwidth, low latency, resilient, scalable and flexible fibre optic based networks for the transmission of audio, video and data. For 19 years, Optocore has been continuously innovating and setting new standards with regards to digital network technology. OPTOCORE builds and develops synchronous optical fibre and CAT5 based network solutions for broadcast professionals — for fixed installations and live event applications. Utilising leading-edge technology and high-quality components Optocore guarantees durability and therefore long-term market and customer satisfaction. Due to the open system architecture, Optocore’s platform offers other manufacturers the option to transfer conventional standard audio, video and data formats used in the pro audio industry, via an Optocore network. Technical expertise, QoS and an extensive support structure are guaranteed to all customers, together with the highest level of quality controls.