COS Fiber Flow: run an open fiber network as one system
An open OSS/BSS platform for operators running fiber networks at scale. Order capture, service activation, provisioning, billing and operational reporting on one system.
400,000+
Active subscribers on the platform
~30
Networks in operation
AE + PON
Both access technologies covered across the COS portfolio
Per port
You pay for ports in use, not capacity in the ground
What is COS Fiber Flow?
COS Fiber Flow is the operational system of record for a fiber network. Orders arrive, services activate, ports provision, invoices go out, and the operator sees the state of the network in real time. One platform rather than five integrations.
It was built for the Nordic municipal model, where a network owner runs open infrastructure and multiple service providers sell across it. That model is spreading. Wholesale consolidation in the UK and open access growth in North America produce the same operational shape: one network, many retail brands, shared infrastructure, and contested responsibility for the subscriber.
COS Systems acquired Fiber Flow from Vinnergi and Bitvis in September 2026. Read the announcement.
Active Ethernet and PON on one platform
Most fiber operators inherit a mix. A PON build in the new districts, Active Ethernet in the older ones, and two provisioning workflows to match.
COS Fiber Flow provisions Active Ethernet. COS Business Engine and COS Wholesale Engine cover PON. Together the portfolio spans both access technologies, so an operator running a mixed estate does not need a separate system per technology.
For operators outside Sweden this closes a real gap. Active Ethernet provisioning has typically been manual work or a bespoke integration. It does not have to be.
Who runs on COS Fiber Flow?
Municipal and city networks operating at scale, mainly in Sweden. Network owners who took operations back in-house and needed a system that runs the whole chain rather than a billing tool bolted to a provisioning script.
The typical profile: tens of thousands of connected households, multiple service providers on the network, a small operations team, and no appetite for a platform that requires a vendor ticket to change a workflow.
Automate without waiting for a vendor release
Most OSS/BSS platforms let you configure what the vendor anticipated. COS Fiber Flow lets you build what you need.
Automations are built in Blockly and Python, inside the platform, at no additional licence cost. Views and menus are customised with HTML and JavaScript to match how your team works. Provisioning, configuration, monitoring and fault handling are all automatable this way.
The event system controls what happens and when. A monitoring event dispatches a message to a technician. An order triggers activation, notifies the service provider and opens a work order, in sequence. You define the chain.
Operators tell us this is the part that matters most. It removes the dependency on individual key people. The knowledge lives in the automation rather than in one engineer’s head.
See the network as it is, not as it was last month
Metabase connects directly to the COS Fiber Flow database. Build your own dashboards against live operational data.
The questions operators ask first: what is our ARPU, and how many premises have a connection but no active subscription? Both are one query away. So are provisioning throughput, fault volumes, operational status and the commercial KPIs a board asks about.
This is direct database access with a BI layer on top. Not a fixed reporting module answering the questions someone else chose.
Integrate with the systems you already run
COS Fiber Flow connects to ERP, CRM, NIS and GIS systems. Share data, trigger events across systems, keep records synchronised without manual re-entry.
Integration is where fiber operations quietly break. A subscriber exists in three systems with three different states, and someone reconciles it by hand every Friday. That work is the target.
Pay for the ports you use
Pricing follows utilisation. You are not charged for ports sitting unused in a network you have not filled yet.
Updates and new versions are included. You buy the platform, not a version of it, so there is no upgrade negotiation each time the software moves forward.
For a network still building, this matters more than list price. Cost tracks revenue rather than footprint.
Which COS platform fits your network?
COS Business Engine
You run the full subscriber lifecycle yourself, whether retail, open access, or hybrid, and you want the whole BSS/OSS chain under one roof.
COS Wholesale Engine
You own infrastructure and your service providers keep their own billing and brand. You need the layer between the network and the retailers selling on it.
COS Fiber Flow
You operate an open network at scale, with multiple service providers selling across it and Active Ethernet in the estate.
Tell us how your network is structured and we will tell you which fits. If the answer is two of them, we will say that too.
COS Fiber Flow and Vinnergi
Vinnergi delivers COS Fiber Flow in Sweden: sales, implementation, integration and support. COS Systems owns and develops the platform.
The combination is deliberate. Software alone does not run a network. Vinnergi’s engineers are in the field, in the cabinets, and in the room when a municipality plans its next phase. Pure software vendors cannot match that.
Frequently asked questions
What is COS Fiber Flow?
An open OSS/BSS platform for operating fiber networks at scale. It covers order handling, service activation, provisioning, billing and operational reporting on one system. COS Systems acquired it from Vinnergi and Bitvis in September 2026.
Who is COS Fiber Flow for?
Network owners and operators running open fiber infrastructure with multiple service providers, particularly municipal and city networks. Over 400,000 active subscribers across nearly 30 networks run on it.
Does COS Fiber Flow support Active Ethernet provisioning?
Yes. COS Fiber Flow provisions Active Ethernet, and the wider COS portfolio covers PON, so operators with a mixed estate run both from one vendor.
Can I build my own automations in COS Fiber Flow?
Yes. Automations are built in Blockly and Python inside the platform, with no additional licence cost. Views and menus are customised with HTML and JavaScript. Provisioning, configuration, monitoring and fault handling can all be automated.
Can COS Fiber Flow integrate with our ERP, CRM, NIS or GIS?
Yes. COS Fiber Flow shares data and triggers events across connected systems so records stay synchronised without manual re-entry.
How is COS Fiber Flow priced?
Per port in use. Unused capacity is not charged. Updates and new versions are included.
What happens to existing Fiber Flow customers after the acquisition?
Service continues without change. Vinnergi remains responsible for sales, implementation, integration and support in Sweden. COS Systems owns and develops the platform.
How is COS Fiber Flow different from COS Business Engine?
COS Business Engine is built for retail operators selling to their own subscribers. COS Fiber Flow is built for network owners operating open infrastructure at scale, with multiple service providers across it and Active Ethernet in the estate.
COS Systems delivers a cloud-based platform built for broadband operators, automating operations from demand generation through provisioning, billing, and field service. Operators run COS Business Engine for retail ISP operations or COS Wholesale Engine for multi-provider Open Access networks, with COS FSM and COS Prospector extending the platform for field service management and door-to-door sales.
