Altnets
    Brands we distribute

    Telecoms underground infrastructure

    Cubis

    Modular infrastructure for a better-connected world.

    Cubis logo

    About Cubis

    Below ground. Ahead of the curve.

    Cubis Systems designs and manufactures modular access chambers, access covers and cable protection systems for underground infrastructure. Its lightweight composite solutions provide an alternative to traditional brick and concrete construction, helping network builders create accessible, adaptable infrastructure.

    For Altnets customers, the focus is Cubis' telecoms offering: protecting underground fibre routes, providing access to cable joints and supporting broadband network rollouts. Modular chambers, covers and accessories work together to meet the practical demands of installation and ongoing network maintenance.

    Close-up of a Cubis Stakkabox chamber section embossed with the Made in Britain stamp

    Specialisms

    Built around the fibre network.

    Telecoms network infrastructure

    Access chambers and cable protection designed to support fibre and broadband deployments, from new network builds to upgrades of existing routes.

    Lightweight modular construction

    Stackable chamber sections simplify on-site assembly and reduce reliance on heavy lifting equipment compared with traditional construction methods.

    Flexible site requirements

    A choice of chamber sizes, access covers and loading capabilities supports installations from footways to carriageways, with products selected to suit each location.

    Project-specific engineering

    Technical collaboration with network builders helps configure chamber layouts, cable entries and accessories around individual project requirements.

    Core products

    From chamber access to cable protection.

    STAKKAbox access chambers

    Modular, stackable underground chambers, including the telecoms-focused JMF range, provide flexible access points for network joints and cabling.

    Access covers and frames

    Composite, steel and ductile iron cover options, including AX-S systems, provide secure chamber access with load ratings suited to the installation environment.

    Cable protection systems

    MULTIduct multiple-way duct systems protect and organise underground cable routes, offering an alternative to conventional banks of individual ducts.

    Chamber accessories

    Cable management brackets, duct entries and access steps help create organised, accessible chambers for installation and future maintenance.

    At a glance

    STAKKAbox

    modular access chambers

    AX-S

    access cover systems

    MULTIduct

    multiple-way cable protection

    Telecoms

    fibre network infrastructure

    Company values

    Connected thinking, lasting progress.

    Innovation

    Product design and engineering challenge traditional construction methods, creating practical ways to build underground networks more efficiently.

    Sustainability

    Responsible manufacturing, recycled materials and recyclable product designs support a more sustainable approach to infrastructure construction.

    Collaboration

    Working closely with customers and industry partners helps translate real network challenges into tailored infrastructure solutions.

    Quality and safety

    An emphasis on dependable products and high manufacturing standards supports infrastructure that can be installed, accessed and maintained with confidence.

    Cubis through Altnets

    Find the right Cubis solution for your network.

    Talk to our team about product selection, availability and project-specific requirements.

    Speak to the team

    Have a question?

    Let's get your network moving.

    Tell us what you're building. We'll come back with a quote, lead times, and a plan.