Twelve bell strikes.
The New Year's Eve chimes from the Puerta del Sol are, every December 31st, the most watched minute on Spanish television.
There is no other event that concentrates more audience, more pressure, and less room for error. If the signal fails at 11:59 PM, there's no second chance. Nor is it acceptable to say «we'll do it again tomorrow.» Excuses don't exist.
enbex was the company tasked with providing internet service for live events of this magnitude, with Coca-Cola as the main sponsor. The deployment covered the sponsor's operations, part of the production in the square, and the network services that made everything work that night. This article explains what it entails to set up a redundant internet system in Puerta del Sol for the most important event of the year.
The most watched event on Spanish television
To understand the pressure of this project, one must know the numbers. On RTVE's La 1 alone, the New Year's Eve bell chimes gather more than 5.8 million people. If we add Antena 3, Telecinco, regional channels, and digital platforms, the figure exceeds 12 million viewers. In some years, it has reached nearly 15 million.
In Puerta del Sol itself, up to 15,000 people gather in front of the clock of the Royal House of Correos. All the main television networks broadcast from the balconies of building number 11, located directly opposite the clock. RTVE, Atresmedia, Mediaset, and Telemadrid compete to offer the best broadcast of the night. Streamers and influencers also add to this, broadcasting live from the square.
All that media deployment needs one thing to work: connectivity. Without the internet, the mobile units can't send the signal. Production loses communication with headquarters. And the most-watched event of the year goes dark.
Criticality: there is no room for error
There are events where a network outage is a problem. On New Year's Eve, a network outage is a catastrophe. There is no exaggeration in that word. If the connection fails during the minute of the grapes, the television signal is interrupted to millions of people. The next day, that failure is front-page news.
That's why connectivity wasn't designed as a conventional service. It was designed as a mission-critical system with redundancy at every layer. The goal was clear: no single failure could take mobile units or the rest of the operation offline.
Redundant Internet: double everything
The internet access system was set up with multiple links from different operators. This way, if one provider had problems, traffic would be diverted to the other without any visible interruption. Load balancing managed both links in parallel during normal operation. And if one failed, failover activated the alternative route in milliseconds.
But the redundancy didn't stop at the links. The internet exit equipment was also duplicated. A primary router and a backup router. If the primary equipment failed—due to hardware failure, an unexpected reboot, or any other cause—the secondary would take over instantly. No manual intervention. No downtime.
In an event where everything is decided in a matter of minutes, having a double team isn't a luxury. It's the only responsible way to work.
Connectivity for production in the plaza
In an event like New Year's Eve, television production is the heart of everything. Several mobile units work simultaneously in the Puerta del Sol. These are trucks equipped with mixing consoles, monitors, and encoding systems. The signal that millions of homes see comes from them.
These units require internet for signal transmission, coordination with headquarters, and remote control systems. Some of that connectivity passed through the infrastructure that Enbex deployed in the plaza. Therefore, the network segment dedicated to production had absolute priority over any other traffic.
The connection powering a mobile unit at an event like this cannot have drops, latency spikes, or packet loss. Any problem is instantly noticeable on the television signal. That's why redundancy and segmentation were the two obsessions of the network design.
Coca-Cola as the main sponsor
Coca-Cola was the main sponsor of the event. This added another layer of demand to the deployment. We not only had to provide service for the television production, but also ensure connectivity for all brand activations in the plaza.
Screens, sound systems, audience interaction points, and sponsor coordination equipment all needed network connectivity. This was integrated into the same infrastructure but on separate segments of production traffic. This way, the brand activation operated independently without impacting critical broadcast services.
The Puerta del Sol as a technical challenge
Setting up telecommunications infrastructure in the Puerta del Sol is not like doing it in an exhibition center or on a race track. It's a public square in the center of Madrid, with limitations on space, access, and setup time.
There are no prepared conduits for running cables. There are also no air-conditioned racks for installing equipment, nor a technical room with dedicated electrical power. Everything is set up temporarily, in a shared space with the stage setup, safety structures, access control barriers, and equipment from the television networks themselves.
Furthermore, the assembly time is very limited. The plaza closes to traffic only a few hours before the event. Network assembly has to be coordinated with the other teams and completed within a tight timeframe. There is no room for improvisation or starting from scratch if something goes wrong.
To all of this, we must add the environmental conditions. It's December 31st. In Madrid. At night. The equipment has to function in the cold. Cables are laid on wet pavement if it has rained. And thousands of people will walk over the conduits for hours. Everything has to be prepared to withstand those conditions without failing.
Monitoring: eyes on every link until twelve o'clock
From the moment the infrastructure is powered on until the last chain closes its broadcast, the enbex team maintains continuous monitoring of every system component. Link status. Latency. Packet loss. Router load. Equipment temperature. Traffic by segment.
The attention is at its peak in the hours leading up to midnight. As the square fills up and the networks begin their special broadcasts, the network load increases progressively. The technical team verifies that each link responds within the expected parameters. If something deviates from the norm, action is taken before the critical moment arrives.
When the clock of the Royal Post Office building begins to chime, the network has already been running stably for hours. Those twelve chimes last less than a minute. But that minute is the result of weeks of design, days of assembly, and hours of supervision.
Live event internet: what this project means for enbex
There are many important events. International congresses, music festivals, sporting competitions, major trade fairs. All of them have their own level of demands. However, none concentrates as much audience in such a short period of time as the New Year's Eve Chimes at Puerta del Sol.
Providing connectivity for this event means operating at the highest level of criticality that exists in live event production in Spain. There is no safety net. Nor a do-over. No «well, we'll improve it next time.» It either works, or it doesn't. And it has to work.
For Enbex, having been part of the technical infrastructure that supports the most-watched event of the year is a reference that speaks for itself.
Technical specifications
Event: New Year's Eve Chimes - Puerta del Sol, Madrid.
Audience More than 12 million viewers on television. Up to 15,000 people in the square.
Title Sponsor Coca-Cola.
Connectivity Redundant internet system with multiple links from different providers. Redundant output equipment (main router + backup). Load balancing and automatic failover.
Services Internet and connectivity for the main sponsor's operation, part of the television production in the plaza, and network services for the event organization. Segmented network with absolute priority for production traffic.
Operation: Real-time monitoring of all links and equipment from network power-on to the shutdown of the last broadcast.
Result: Stable and uninterrupted connectivity during Spain's most-watched broadcast of the year.
Can your event not afford even a second of downtime? Contact enbex. We know what it means to have no room for error.