Telecom Infra Project introduces Open FAN to promote multi-vendor interoperability

The Telecom Infra Project (TIP) has announced a new initiative for “open fixed access networks (FAN)” at the FYUZ conference in in Madrid, Spain.  The Open FAN initiative is being led by Telefónica, Telecom Italia, and Vodafone.  As in the mobile radio access network, the goal is to ensure products from competing vendors can be combined in the same fixed access network.  That is the essence of true interoperability.

The work will focus on improving interoperability and diversity in the access network, accelerating innovation and boosting capacity in the last mile through the transition from GPON to XGS-PON.  Specifically, Open FAN is targeting the link between optical line terminals (OLTs) and optical network terminals (ONTs), the boxes that sit at either end of a fiber connection. Integration with SDN controllers, the traffic cops of the network, is another priority.  Open FAN has just become the latest TIP sub-group, part of the fixed access project group.


TIPs Fixed Broadband Project Group is developing a new generation of open and disaggregated technologies that help operators increase the availability of fast and reliable broadband services across the world.  The goal of the TIP fixed access sub-group is to build access networks capable of delivering high speed connectivity over the last mile. The primary objective for this group is to achieve a high degree of interoperability in the access domain, including:

  • East-west interworking and integration between network elements
  • Northbound integrations to OSS and network management systems


Participants are currently drawing up technical requirements for a so-called “pizza box” OLT that can be delivered to the local telco. They will issue a request for information later this year as they assess the technical capabilities of vendors and their “readiness” for open FAN.

“The disaggregation of OLTs represents a valuable opportunity to broaden the telecom supply chain, which we’ve seen has become more important than ever during recent times,” said Paolo Pellegrini, TIM’s access innovation project manager, in telling remarks. “TIM is excited about the opportunities to work with a new generation of hardware and software suppliers who can bring innovative solutions that will help us build more cost-effective and efficient networks.”

Data from Omdia, owned by Informa,  shows that just three vendors controlled 85% of the market for OLTs last year. Two of them, Huawei and ZTE, are Chinese, leaving Nokia as the only other supplier. The lack of alternatives explains why the UK government was less restrictive in fixed than it was in mobile when clamping down on Chinese vendors.

TIP probably hopes interoperability will boost competition in a market for passive optical network (PON) products worth about $8 billion in sales last year. If operators could more easily buy OLTs separately from ONTs, developers could focus resources on one area. An OLT specialist would not require an ONT capability to compete.

Today, mixing FAN products from different vendors is problematic, said a source at TIP, and Nokia seems to agree.

“It is not easy to do, but it is something that we do,” said Federico Guillén, the head of Nokia’s network infrastructure business group, during an interview at the recent Network X event in Amsterdam. “If you do this, you have to put in some rules for how the OLT and the ONT communicate and set a lower denominator, which means you are missing some features. Interoperability doesn’t come for free.”

Telecom already has an interface for connecting OLTs to ONTs, called OMCI (for ONT management control interface). But when it comes to multi-vendor interoperability, this does not seem to have delivered. “It was perfectly standardized, and everyone was implementing and following, but they were choosing different options,” said Stefaan Vanhastel, the chief technology officer for Nokia’s fixed network unit.

Nokia served about 24% of the global PON market last year, according to Omdia’s data, but has increased its presence in OLTs, according to Guillén. A backlash against Huawei in many countries outside China has probably helped. “Our market share is growing, especially where we want it to grow, which is the OLT side,” he told Light Reading. “The ONT side is a very crowded space.”

Specialists may find that challenging Nokia in the FAN is just as hard as it is in the RAN. Last year it pumped €4.2 billion (US$4.2 billion) into research and development, including investments in the silicon platforms that support higher-speed broadband services. At Network X, it announced a new OLT, branded Lightspan MF-14, that provides an upgrade path to 100G-capable networks. “Operators have a solution that will be reusable as line cards are upgraded over time,” said Julie Kunstler, chief analyst with Omdia. “This has lots of capacity and ONTs will be upgraded as needed.”

The new TIP Open FAN subgroup expects to issue an RFI to establish the technical capabilities and readiness of suppliers to deliver such a solution later in the year, with test and validation to follow.However, there was no mention of network equipment vendor support for open FAN in the TIP’s statement and without that it could struggle. If enough operators urge change, those vendors may have to budge – but the wariness of Ericsson and Nokia about open RAN illustrates just how difficult that could be. Open FAN also appears to lack an equivalent of the O-RAN Alliance, the group developing open RAN specifications. TIP has previously distanced itself from specifications development. If an alternative to OMCI is needed, who takes the lead?

Whether open FAN becomes as big a deal as open RAN is doubtful. For one thing, operators spent about $37 billion less on FAN products last year than on RAN kit, according to Omdia’s numbers. Most of their fixed-line capex goes into civil engineering, and no amount of interoperability or virtualization will save money there.

Despite the muscle of Huawei, Nokia and ZTE, the market was also growing more competitive before open FAN was a thing, according to Omdia’s Kunstler. Ciena, an optical equipment vendor based in the US, and Sterlite, an Indian firm that sells fiber-optic cable, are just two examples of companies moving into a PON market forecast to generate nearly $16 billion in annual sales by 2027.


Fixed Broadband




One thought on “Telecom Infra Project introduces Open FAN to promote multi-vendor interoperability

  1. Telecom Infra Project (TIP) announced additional partnerships with Intel and Analog Devices, furthering its recent move to prepare the telecom industry for the metaverse.

    Previously the organization had brought on T-Mobile, Microsoft, Telefónica, Meta Platforms, and Sparkle as starting co-chairs of a metaverse-ready networks project group. The team aims to prepare the architectures, APIs, and mechanisms needed for end-to-end network capabilities that can support the immersive applications at scale.

    TIP is now bringing in Intel and Analog to focus on a massive multiple-input multiple-output (mMIMO) solution for its “beamforming capabilities, concentrate[d] bandwidth to devices,” and its “capability to deliver metaverse experiences from a single 5G radio,” according to a press release about the news.

    The collaboration will operate under the TIP OpenRAN project group – an initiative to define and construct open-architecture radio access network (RAN) solutions – and will yield a 5G mMIMO open RAN (O-RAN) radio unit (O-RU) white box.

    Distributed by Intel and powered by its Intel Agilex, the white box will leverage the company’s beamforming technology and Analog Devices’ RadioVerse System on Chip (SoC) software-defined transceiver.

    Ready-to-deploy mMIMO wideband – “conceived as a 32-antenna element wideband standalone radio unit supporting O-RAN interfaces and advanced software applications” – will be equipped to the white box.

    The group claims the white box will “open the door to a wider playing field of system integrators, giving operators more options to meet their specific requirements while helping mitigate vendor lock-in.”

    TIP stated that no mMIMO solutions with end-to-end capabilities are available, and the partnership intends to change it.

    The build further substantiates the significant role 5G is set to play in the technology’s development, according to the organization.

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