Cambium ePMP GA release 5.11.0 is now available
- Gerhard Janse van Rensburg - Product Manager
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Cambium’s ePMP 5.11.0 firmware is now available as a General Availability (GA) release, with download access via the Cambium website or through cnMaestro for all supported ePMP AX devices.
This follows the earlier beta cycle (including 5.11.0-RC54), where these features were introduced and validated.
Note: While earlier beta firmware was intended for testing environments only, this GA release is approved for production use. As with any firmware upgrade, it is recommended to evaluate performance in a controlled environment before wide deployment.
South African WISPs are under constant pressure to do more with less. More subscribers per sector. More throughput. Lower latency. All while dealing with interference, long links, and increasingly demanding customers. The Cambium Networks ePMP platform has already earned its place in many local networks by bringing Wi-Fi 6 into fixed wireless access. But hardware alone does not solve real-world problems. The software layer is where networks either perform consistently or become difficult to manage.
Release 5.11.0 is not a cosmetic update. It introduces changes that directly address common pain points in dense, high-usage South African deployments. For WISPs running or planning ePMP AX networks, this is a release worth paying attention to.
Smarter airtime use where it actually matters
Anyone running a busy sector knows the issue: one or two heavy users can quietly ruin the experience for everyone else. Voice calls break up. Interactive traffic stutters. Customers complain about “random” issues that are hard to pin down.
The new Station Selection feature changes how the access point schedules traffic. Instead of treating all stations equally, the AP now understands traffic priority per station and serves it accordingly:
- Voice traffic is prioritised most aggressively
- Interactive applications follow
- Background traffic is deliberately deprioritised
The result is more predictable airtime behaviour in dense sectors. VoIP stays usable, interactive traffic feels responsive, and background downloads stop impacting the rest of the network.
For operators selling higher-speed packages on shared infrastructure, this is a meaningful improvement in day-to-day quality of experience.
Better uplink performance on long links
Long-distance uplinks are often the first thing to fail as networks grow. The downlink looks strong on paper, but the uplink RSSI becomes the limiting factor.
This release extends Asymmetric Uplink Bandwidth to include management frames, improving real-world behaviour on long-range connections. By running a smaller uplink channel:
- Transmit power density improves
- Stable connections are maintained at range
- Downlink throughput is preserved
For South African operators pushing distance on rural links, this is a practical advantage.
Smoother TCP behaviour under load
High-speed networks do not always behave well when traffic transitions between fibre backhaul and wireless access. TCP microbursts can cause sudden latency spikes and packet loss, even when average throughput appears stable.
The new TCP Microburst Mitigation feature optimises how acknowledgements are handled on the uplink:
- Smoother data flow
- Reduced burst behaviour
- More consistent performance under load
This is an improvement that is noticeable in live environments, particularly under sustained usage.
Easier validation of MU-MIMO performance
The ePMP AX platform introduces advanced MU-MIMO capabilities, but validating performance has not always been straightforward.
The updated Wireless Link Test now exposes MU-MIMO capability indicators, allowing installers and network engineers to:
- Verify correct client grouping
- Confirm spatial stream utilisation
This simplifies commissioning, alignment, and troubleshooting, making MU-MIMO performance easier to validate in the field.
Stability and recovery improvements
Additional updates include:
- Improved GPS stability and signal validity
- Smarter scanning behaviour on subscriber modules, reducing downtime during AP recovery
These improvements reduce intermittent issues, improve recovery times, and contribute to overall network stability.
Why this release matters
The ePMP AX platform was built to be future-ready. Release 5.11.0 reflects continued refinement of the software layer to match real-world deployment challenges, particularly in demanding environments like South Africa.
This firmware is not focused on peak throughput figures. It is focused on control, predictability, and maintaining a consistent user experience as networks scale.
Looking ahead: benefits for 6 GHz
Although 6 GHz is not yet available for use in South Africa, the ePMP AX platform, along with the enhancements introduced in this release, positions operators to adopt it efficiently once ICASA finalises the regulatory framework.
Supported devices
The firmware is available for supported ePMP AX devices, including:
- ePMP 4500 / 4500C / 4500L / 4518
- ePMP 4600 / 4600L / 4600C / 4625
- ePMP 4525 / 4525L
- Force 400 / Force 425
Access requires a valid Cambium account.

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