LibreNMS and Cambium Networks

What Can Libre do for the Cambium operator?

Number of registered SMs. This AP has 7

 

Interface traffic

Number of GPS Satellites tracked

Modulation

Libre can be setup for thresholds.  Any of the above graphs can be set up to alert based upon a threshold.  You could setup an alert that says if SMs on an AP drop by 10% kick out an alert.  This could alert you to possible frequency issues.   You could set a threshold for if traffic reaches a certain level.

Cambium ePMP 3000 features

An older post but still relative. Figured I would re-post this.

Cambium and CTIconnecxt put on a webinar about ePMP 3000 today.  This should be available online at one point.  Look for it in the Cambium forums.

Some notes I took
-ePMP 3000 offers Simultaneous MIMO downlink transmission
-You will be able to use the beamsteering antenna with the 3000.  Cambium is working on the software to make this work.
-3000 has a dedicated receiver chip.  This allows you to run the spectrum analyzer in realtime. Also has “edetect on steroids” which shows more information than the current edetect.
-Sector is a 4X4 90 degree sector with beamforming. Achieves and extra 3db in the downlink.

Beamforming vs Beamsteering
Beamsteering is for dealing with interference.
Beamforming is for downlink gain.

-Cambium mentioned the concept of Azimuth Delta.  This is groups of SMs in terms of how the AP talks to groups.  The gave an example on a google earth plot.  In a nutshell, when you have gain in one direction it takes advantage of the null in different directions. More to this, but that is for another post.

-“Sounding” -Sends a special packet and gets feedback from the subscriber. Determines how the phase shift works and other things.

-Elevated clients beta is coming to make the elevated clients work with the 3000.

I hope distributors work out a smaller cold shrink for the sma connectors on the ePMP Ap radios.  Weatherproofing these properly will be an issue due to the close proximity of the connectors.  I have not seen the connectors on a sector to see how those will be.  This is where folks could take a page from the coldshring that comes with the Baicells gear or the cables with the integrated boot some distributors sell.

 

Cambium PTP 550 Data Rates

Some info on the cambium PTP 550 Data Rates

“Downlink Max Rate” specifies the maximum downlink MCS value that the Rate Adapt algorithm will choose.
MCS values range for data from MCS 9 to MCS 1 for one or two Spatial Streams (Single Stream and Dual Stream respectively). A higher MCS value (e.g. MCS 9) carries more data, but requires more link budget / stronger radio signal. Thus, MCS 9 provides the most data, but the least robust link (i.e. greatest chance data can be lost) and MCS 1 provides the least data, but the most robust link (i.e. least change data can be lost).
DS MCS provide two streams of independent data over the two transmit chains while SS MCS provide one stream of data over both transmit chains.
Setting “Uplink Max Rate” to a DS MCS 9 – DS MCS 1 value will allow this MCS and all lower dual stream MCS values to be used along with all similar or lower single stream MCS values. For example, choosing DS MCS 8 means that DS MCS 8 – DS MCS 1 and SS MCS 8 – SS MCS 1 will be used in the Rate Adapt algorithm. Setting “Uplink Max Rate” to an SS MCS 7 – SS MCS 1 value will allow this and all lower single stream MCS values.

Rates Highest to lowest
DS MCS9 – 256-QAM 5/6
DS MCS8 – 256-QAM 3/4
DS MCS7 – 64-QAM 5/6
DS MCS6 – 64-QAM 3/4
DS MCS5 – 64-QAM 2/3
DS MCS4 – 16-QAM 3/4
DS MCS3 – 16-QAM 3/4
DS MCS2 – QPSK 3/4
DS MCS1 – QPSK 1/2
SS MCS9 – 256-QAM 5/6
SS MCS8 – 256-QAM 3/4
SS MCS7 – 64-QAM 5/6
SS MCS6 – 64-QAM 3/4
SS MCS5 – 64 QAM 2/3
SS MCS4 – 16-QAM-3/4
SS MCS3 – 16-QAM 1/2
SS MCS2- QPSk3/4
SS MCS1 – QPSK 1/2

MCS\Rx Sensitivity  20 MHz       40 MHz       80 MHz
Lowest MCS          -90 dBm     -87 dBm       -83 dBm
Highest MCS .       -66 dBm     -62 dBm        -59 dBm

 

Cambium announces CBRS SAS service for PMP 450

From their release

Cambium Networks is pleased to announce the commencement of the CBRS SAS Services, providing service in in the CBRS (Citizens Band Radio Service) spectrum (3.55 to 3.7 GHz). Support is offered on the PMP 450 series platforms utilizing the cnMaestro management system. 

There are several SAS System Administrators that are in operation today. Cambium Networks will work with three of them; Federated Wireless, Google and CommScope*. The operator will select one at the time of sign up via cnMaestro. The pricing to use these SAS Services is the same regardless of the provider.  Pricing will be $3 per Subscriber Module per month. (There is no charge for the Access Point). 

 

http://community.cambiumnetworks.com/t5/CBRS/Cambium-Networks-Announces-Commencement-of-CBRS-Services/m-p/112989#M55