Passcomm Fibre Optic Solutions – London Underground Connectivity Project

Project Overview

Boldyn Networks, in partnership with Transport for London (TfL), is deploying one of the world’s most advanced underground connectivity networks. The project delivers high-speed 4G and 5G coverage across 137 stations and 400 km of tunnel pairs, with capacity for future upgrades to 6G and 7G. This initiative supports London’s ambition to become a smarter, safer, and more connected city.

Engineering Challenges

• Installation in confined, complex underground spaces with limited 4-hour maintenance windows
• Exposure to damp, dust, and heat-prone environments
• High-fibre-count ribbon fibre deployment requiring rapid, reliable, and safe installation
• Compliance with TfL’s strict safety, fire, and material standards

Passcomm’s Contribution

Passcomm supplied bespoke stainless steel Fibre Optic Splice Enclosures (FOSE) engineered specifically for the London Underground:

• Durable Materials & Safety Compliance: Stainless steel construction, IP-rated, inflammable, fully compliant with TfL standards
• Rapid Deployment: Designed for fast installation of high-fibre-count ribbons within strict time windows
• Environmental Resilience: Dust-proof, moisture-resistant, and suitable for tunnel and station environments
• Installation Planning Support: 3D visualisation and site planning to optimise equipment placement and installation efficiency

Technical Outcomes

• Supported deployment of 2,000 km of fibre cabling and 17,500 radios across the network
• Enabled continuous, high-capacity mobile coverage in ticket halls, platforms, and tunnels
• Ensured long-term reliability and compliance with stringent underground safety standards
• Facilitated future network upgrades (6G/7G) through scalable fibre infrastructure

Business Impact

• Reduced installation and operational risk, accelerating project delivery
• Provided a robust, future-proof fibre backbone critical to London’s smart city infrastructure
• Delivered socio-economic benefits by improving connectivity for commuters, businesses, and communities

Conclusion

Passcomm’s engineering expertise and bespoke FOSE solutions were pivotal to the London Underground connectivity project. By combining durability, rapid deployment, and compliance with stringent safety standards, Passcomm enabled the successful implementation of a high-capacity, resilient fibre network in one of the world’s most challenging urban transport environments.