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When the Ground Shifts Under Fixed Wireless: Lessons from Cambium’s Decline

For years, Cambium Networks was considered a bedrock vendor for wireless internet service providers (WISPs) across North America and beyond. Its point-to-multipoint gear, ePMP and PMP series radios, and cloud-managed networking tools gave small-to-midsize ISPs the tools to build competitive fixed wireless access (FWA) networks — often in rural and underserved communities where fiber simply wasn’t economically viable. That reliability, real or perceived, made Cambium a default choice. Which is precisely why its recent financial and operational struggles have hit so many operators so hard.

The company’s difficulties — including layoffs, product line uncertainty, and eroding customer confidence — have left a significant portion of the WISP ecosystem scrambling. For operators who built their entire access infrastructure around Cambium’s proprietary protocols and cloud management platforms, the situation isn’t just inconvenient. It’s existentially threatening. Migrating away from a deeply integrated vendor stack mid-deployment isn’t a weekend project. It can mean re-engineering tower infrastructure, retraining field technicians, renegotiating support contracts, and in worst-case scenarios, experiencing service disruptions that put hard-won subscribers at risk of churn.

Vendor Lock-In: An Old Problem With New Consequences

The telecom industry has wrestled with vendor concentration risk for decades — from the Huawei and ZTE debates at the macro network level to smaller-scale dependencies in the enterprise and edge markets. But the WISP segment has historically flown below the radar of risk management scrutiny. Many of these operators are small businesses with lean teams and limited capital reserves. They chose Cambium precisely because it offered a coherent, integrated ecosystem. Now that ecosystem has become a liability.

The core technical problem is interoperability. Much of Cambium’s subscriber module and base station technology operates on proprietary air interfaces, particularly in its older PMP 450 series. Unlike standards-based technologies such as CBRS (Citizens Broadband Radio Service) or unlicensed Wi-Fi 6E deployments, these systems don’t offer a plug-and-play migration path to competing platforms like Ubiquiti, Baicells, or MikroTik. Operators are effectively stranded on an island, watching the ferry operator reduce its routes.

The situation is prompting serious conversations about open standards adoption across the WISP community. Industry groups like the Wireless Internet Service Providers Association (WISPA) are increasingly advocating for multi-vendor network designs and encouraging members to evaluate CBRS-based LTE and 5G NR solutions that offer greater ecosystem diversity. The Open RAN philosophy, while typically discussed in the context of major carrier networks, is finding unexpected relevance in the WISP world.

CBRS and LTE: The Pragmatic Exit Ramp

For WISPs looking to reduce exposure, CBRS-band deployments have emerged as one of the most practical pivots. Operating in the 3.5 GHz band with a mix of General Authorized Access (GAA) and Priority Access License (PAL) tiers, CBRS offers a standards-based LTE — and increasingly 5G NR — framework with multiple competing vendors. Companies like Baicells, Casa Systems, and even Ericsson’s smaller-footprint solutions are actively courting displaced Cambium customers. The pitch is straightforward: open standards mean you’re never locked to a single vendor’s survival trajectory again.

The Other Side of the Ledger: Private 5G and IoT Keep Climbing

While FWA grapples with its turbulence, two adjacent segments are posting some of the most consistent growth metrics in the broader wireless industry: private 5G networks and the Internet of Things. The contrast is instructive.

Private 5G, often deployed in manufacturing facilities, ports, logistics campuses, and healthcare environments, continues to attract enterprise capital. Analyst firm Dell’Oro Group projects the private wireless network market to surpass $10 billion annually by the mid-2020s, fueled by demand for ultra-low latency, high-density device connectivity, and network slicing capabilities that public carriers simply cannot guarantee at the application layer. Vendors like Ericsson, Nokia, Celona, and Druid Software are all reporting active pipeline growth, and systems integrators are building dedicated private 5G practice areas.

IoT, meanwhile, is benefiting from the maturation of Low Power Wide Area Network (LPWAN) technologies like LTE-M, NB-IoT, and LoRaWAN, alongside the gradual expansion of 5G RedCap (Reduced Capability) devices. RedCap — formally known as NR-Light in 3GPP Release 17 — promises to fill the gap between high-throughput 5G devices and low-power IoT endpoints, enabling connected sensors, wearables, and industrial monitors to operate efficiently on 5G infrastructure without the cost and power overhead of full NR implementations.

Why the Divergence?

The contrast between FWA’s vendor-driven fragility and IoT/private 5G’s momentum isn’t purely coincidental. Private 5G and IoT ecosystems were largely built on 3GPP standards from the ground up, attracting diverse vendor participation and reducing single-point-of-failure risks. FWA, particularly in the WISP segment, evolved organically from proprietary Wi-Fi and licensed fixed wireless platforms that prioritized performance in constrained markets over long-term ecosystem resilience.

Industry Outlook: Resilience Through Standardization

The Cambium situation may ultimately prove to be the catalyst the WISP industry needed to accelerate its adoption of open, standards-based technologies. The pain is real and immediate for affected operators, but the long-term trajectory points toward a healthier, more competitive vendor landscape for fixed wireless access — one where no single company’s balance sheet can hold an entire market hostage.

For telecom professionals watching this space, the broader takeaway is clear: in an industry defined by rapid technological evolution and consolidation pressure, architectural decisions made for convenience today can become strategic vulnerabilities tomorrow. Whether deploying FWA in rural Kansas or private 5G in a German automotive plant, the operators who build on open standards and maintain multi-vendor flexibility will be the ones best positioned to weather the next disruption — whatever form it takes.