Thanks! Learning slowly but surely! Thanks for all the info.
I was wondering how you figure out whether a given tower has 5,10,15, or 20 Mhz available on a given band, if it was deduced from real world performance or can be looked up.
Folks ⌠it is not that simple. Knowing what the allocated bandwidth is is useful. But do you also know the following?
- System losses (log-normal fading, Raleigh fading; attenuation due to man-made and natural obstacles, etc)
- Carrier power budget (TX and RX; includes such basics as TX power, RX sensitivity, antenna gain and line loss)
- Antenna system design & performance (down-tilt, diversity scheme, etc)
- Cel geometry (azimuth limits of each cel; and donât think all sites are intended to perform similarly in all directions)
- Modulation schemes, fade margins, BER, etc
- Carrier algorithms (decision rules) regarding band assignment/frequency utilization
- Back-haul capacity
- etc.
Sometimes it is just best to âexperimentâ (translation: try a number of well thought-out alternatives which are based on solid experience and a modicum of technical knowledge).
OK ⌠Iâm finished 
[/set lecture OFF]
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Really appreciate all the info to understand how things are working at least a little bit better than before though.
Interesting how in the screenshot above there are two LTE Band 66; mine will only LTE-A with band 12 primary and Band 66 secondary on the tower Iâm pointed at (Itâs too bad it wonât LTE-A with 66 as primary and 12 as secondary since the upload bandwidth is much better on 66 and that gets sacrificed the other way around; but it doesnât. ) It has never gotten two Band 66 connections like in the screenshot above. I get about 20-30 mbps upload and download though on the single band 66 connection so Iâm happy right now.
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Hello @aquablue
Please check that the cellular chipset firmware is up to date. Here are some references:
- If the chipset is Sierra Wireless EM7565, Peplink is using 01.08.04.00; the latest release is here
https://source.sierrawireless.com/resources/airprime/minicard/75xx/airprime-em_mc75xx-approved-fw-packages/#sthash.1LXKELRU.dpbs - If the chipset is Sierra Wireless MC7430, Peplink is using 02.30.03.00; the latest release is here
https://source.sierrawireless.com/resources/airprime/minicard/74xx/airprime-em_mc74xx-approved-fw-packages/#sthash.6QPa5u79.WgetjB3p.dpbs - If the chipset is Telit, then you need to be a Telit Partner to have access to the current version releases and notes. Telit currently has the latest firmware versions hidden from the public. Hopefully, they will open up in the future and make the information publicly available as the other manufactures do.
It is fair to expect there are releases with Telit that address the specific ways that Telit chipsets operate with the various mobile/cellular networks around the world. Base on our experience, we recommend raising a support ticket so that the Peplink Engineering team can dig deeper. We have an existing ticket #20030685 with @sitloongs on the issues with cellular firmware releases. By working with the Peplink support team, we confirmed a fault with the Telit firmware that was preventing the chipset from working correctly with Telstra in Australia. Currently, the only way to do cellular firmware updates for Tilet supplied models is to have Peplink manually log into every Tilet Cat-18 chipset and remotely patch the chipset. Hopefully, this will get addressed in the future system firmware updates (such as 8.1.0).
Happy to Help,
Marcus 
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Thanks very much for the info. Yes, Telit LM960 running firmware 32.00.153 modem hardware revision 1.0. This explains why the support.cgi check for modem firmware button returns âtry again laterâ right now.
Hello @aquablue,
Your Telit LM960 is on newer firmware than the units deployed here in Australia (such as MBX HD4 & EPX/SDX units). Put a ticket in with Peplink Support and invite them to take a deaper look into your system, maybe they will find something to assist you that can then be deployed to everyone.
Happy to Help,
Marcus