Cambium is officially releasing the PMP450x Radio 20.2 software.
Radio software and documentation can be found at https://support.cambiumnetworks.com/files/pmp450/. CBRS procedures that involve both cnMaestro and radio software can be found in the cnMaestro repository at https://support.cambiumnetworks.com/files/cnmaestro/
System Release 20.2 introduces support for Cambium’s CBRS Multigrant feature. Operators are strongly encouraged to upgrade to 20.2 and begin the conversion of their single wideband grants to multigrant in preparation for PAL rollout, which is expected to begin on April 19th.
WARNING
Upgrade SMs first to System release 20.0 or later and then upgrade the AP, otherwise SMs will connect but at a maximum modulation rate of 2X MIMO-B, until both sides are running System Release 20.2 or later.System Release 20.0 introduces support for TLS v1.2 and v1.3. TLS v1.1 is no longer supported. CNUT 4.13.3 supports TLS v1.1 only and cannot upgrade PMP/PTP devices running System release 20.0 or later that are configured for HTTPS only web access.
CBRS Multigrant support and PAL rollout support
In System Release 20.1 and prior, the device asks for a single grant regardless of the channel Bandwidth the device is configured for. If a single 10 MHz channel needs to be terminated (for example, a PAL is now protected on that channel), or suspended (for example, a DPA activated on that channel), currently the entire wider channel is affected.
With System Release 20.2, the device has a configuration option to ask for multiple 10 MHz grants
The below figure dispays this configuration option on the AP. Impacts to other UI images are shown in the Configuration Guide and the CBRS Consolidated Procedures Guide. Details on how to use the feature are detailed in the CBRS Consolidated Procedures Guide.
Two other configuration options are also introduced, and their purposes are explained in Configuration Guide and the CBRS Consolidated Procedures Guide.
A 1.6.1 revision of the Consolidated Procedures Guide contains several updates from the 1.6 version that was posted with the 20.2 BETA release on 7th April 2021.
Operators need 3.0.2 cnMaestro for full compatibility with the CBRS Management Tool, such as live CBRS grant status updates to cnMaestro, and the request of new grants as multigrants from the tool. However, conversions to multigrants for existing widegrants can be done with System Release 20.2 on devices still onboarded to 3.0.0/3.0.1 cnMaestro software versions.
The training videos, parts 1 and 2, are available here:
Problems and Limitations corrected in System Release 20.2
Products Affected | Tracking | Description |
---|---|---|
All 3 GHz APs | CPY-17201 | TX Power or EIRP for 450m was not increased as bandwidth was automatically increased when multigrant was in operation. |
450m AP | CPY-17254 | AP sometimes experienced stack lockup after the configuration file was loaded. Traffic still passed, but pings, telnets, https, etc did not respond. |
Known Problems or Limitations in System Release 20.2
Products Affected | Tracking | Workaround/Description |
---|---|---|
All 3 GHz CBRS SM/AP/BHM/BHS | CPY-17257 | In previous Software Releases, the “CBRS Staus List” table in the HOME > Session status Page on the AP would show a “TMP” indication if a granted EIRP was a temporary “Same Day Grant” value. This is missing in System Release 20.2. There is a plan to re-introduce this in a future release. |
3 GHz 450m | CPY-17253 | There is an error message that appears roughly every 2 minutes in the event log of a 3 GHz 450m holding a CBRS grant that says “Configured beyond max EIRP, lowering transmit power from xx dBm to xx dBm” This is harmless - there is no actual transmit power issue or lowering taking place, the only negative is that it fills up the event log over time. Workaround: Until Cambium is able to fix this error in a future release, navigate to the Configuration > Radio page on your AP, lower the EIRP by 1 dB from it’s current setting, then click SAVE. Then immediately raise the EIRP back to it’s previous value and click SAVE again. This workaround will need to be re-applied after every 450m AP reboot. |
All 3 GHz AP/BHM | CPY-17231 | Follow-me is not updating the SM’s in all possible cases in System Release 20.2 when using multigrant. Workaround: Operators are requested to check and make necessary bandwidth if needed and center frequency additions to their SM scan lists. See the CBRS Consolidated Procedures Guide for more details. |