In a previous post, I mentioned a 5-mile link using Cambium PTP550s and why frequency matters. Today we enabled the second radio and have some results from that. First, let us talk about some of the parameters.
As you can see from our frequency scan we have a very noisy frequency. Without DFS we have very few open channels. Due to this, the results you will see later are not optimal. The limiting factor is the noise on the band.
After much channel selection, this is what we ended up with. As you can see we are just running a 40mhz and a 20mhz channel. This is because the band is so noisy.
As a result of the frequency, this is what we have ended up with for quality and capacity. The second radio is less than optimal, but it is passing solid data.
So what do speed tests look like across the link?
Some of you may still be asking, it should be more. If you have noticed the noisy frequency band has been the greatest factor on this link. In the quality and capacity screenshot, you will notice the 2nd radio only has a 45% capacity. This is due to channel selection. If we could get better channels this would improve the link.
Wo what is the answer? Better backhaul antennas are upgrade number 1. Currently, we are using UBNT 2 foot dishes, which were chosen due to the gain needed on this link. Secondly, when DFS is certified for these radios we will have more channels available. The frequency scan shows the DFS channels are less noisy in this area, which will increase throughput.
Just for giggles, we had the tech on-site run a speedtest. This was through a wireless router with a 100 meg ethernet port plugged into the local router.
Recently we installed a PTP 550 link for a client. This is a connectorized version with 2-foot dishes on it for a four-mile link. Overkill you say, but the idea is the dishes make up the gain and not transmitter power. A much cleaner signal can be achieved which falls within the FCC guidelines for total EIRP.
So let’s get to it. Our first image is out path. This link had clear line of sight from a 150-foot foot water tower to a 240-foot tower.
After getting out of the cold we let things burn in for a few days. This is what an initial spectrum analysis looked like.
As you can see the RSSI was within 2 DB, which isn’t terrible. However, due to interference, the MCS rates are markedly different, which is what results in the big differences in speed. Please note this is only with one radio enabled and on a 20mhz channel. We fully expect bigger speeds once we up channel sizes and enable the second radio.
In 2006 I was hired on part-time for Purdue University. My days would consist of mornings on Campus at Purdue doing I.T. support for the Agronomy Department and afternoons, evenings, and weekends doing support and build-outs for NDWave. We were in the mode of dumping everything back into the company to get to a solid sustainable position. I didn’t really want to go back to desktop support, but the benefits and part-time position helped to pay off bills we had accumulated with MTIN. Purdue allowed me to meet Donnie Payne. Donnie is an infectious personality sort of person. Just being around him motivates you to do things. Purdue allowed me to work with Mac OSX Xserves, cutting-edge Linux servers, and special projects. One of the coolest projects I worked on included remote sensor trailers. We had servers, remote reboots, and had to deal with how to get connectivity out in BFE. Several sites had cellular or satellite uplinks. I was able to apply my ISP knowledge to this project.
NDWave exposed us to lots of rockstars in the ISP industry. JohnnyO and his crew helping with removing feedhorns from a tower is something I will never forget. Sitting outside a hotel with him cooking dinner. Guys like Chuck Hogg, who helped the industry in several ways and is just a plain cool cat. The work alone has opened up friendships which were well worth any long days. Guys like Jay Panozzo, who are not directly connected with the WISP industry, but have their parts. Jay owns Midamerica Towers and is a Man among men. Jay sets the bar for the tower professional.
I continued to dedicate time to Purdue and Ndwave until April 2008. One month before Omnicity took over management of the NDWave network I became a full time employee. Omnicity started out good, but quickly went downhill after a year for me. With all the lawsuits in place that is about all I will say about that.
After being separated form Omnicity I continued to keep my head above water with steady consulting from companies I had helped over the past couple of years. Kenny Johnson at Mooreland ISP and Scott Reed at NewWays were two of my best customers. I truly understood what it was like to be the one the buck stops with. When you have a tower outage at 1AM. the customer does not care except they have no Internet. Early morning climbs to repair Aps in the dead of winter were not uncommon. That is part of what it takes. Being a former owner really helped me connect with what these guys are going through.
Things were slow so I was able to re-group some. I did not mess with much technology except when I had to. I took a step back and concentrated on the activities I enjoyed. I stepped up collecting G.I. Joe figures visited more friends, and generally did non-tech related things. This in itself expanded those I call friends. My mind and soul needed that healing. Then a funny thing happened. I started writing this blog, becoming active on mailing lists again, and generally became interested in the technology again. I started gaining more and more consulting clients and working with more and more networks. Ubiquiti was just starting to come on the scene, Mikrotik was a mature platform, and prices were starting to come down on gear. I remember sitting around 3 years ago thinking I needed to step up what I am doing. It took me up until then to realize I had enough experience and stuff running around in my head to be an expert. I have watched so-called experts screw up even the simplest things.
In the past couple of years, things have really blossomed in the Industry and I have had the pleasure of being a part of some of it. When you look back on this there are certain key points where you take leaps and bounds. Once I was able to step back and further enjoy things that next leap up was taken. This allowed me to open new pathways of thinking too. My confidence soared, my shyness subsided, and life got better. I attribute this to those who have influenced my life, and the experiences we have shared.
Stripping wireless gear off a 120 foot tower in Chicago with Mike Hammett is one of my fondest memories. The work was hard and long, but having the comrade in arms with you to do it make up for it. There is a bond that is formed which last a lifetime. Mike is one of those guys you want to see succeed. I am fortunate to have been in a position on a couple of occasions to help him when it would have been a paid for him to hire it out.
This brings us to present day…
Continued in part 5 (the conclusion I promise)
The following are results from a series of tests of AGLcom’s parabolic dish antennas on an existing link that is 5.7 miles long. The link typically passes 80-90Mbs with a TX capacity of 140 Mbs and radios used are Ubiquiti AF5X operating at 5218 Mhz. A full PDF with better Readability can be downloaded here..
The tests were taken in stages:
- 1) The normal performance of the link was recorded.
- 2) The 2′ dish at one end, B, was replaced with the AGLcom, C, dish and the link reestablished.The link performance was recorded.
- 3) The 2′ dish at the other end, A, was replaced with the AGLcom, D, dish and the link reestablished. The link performance was recorded.
- 4) The setting on the AF5xs were adjusted to optimize the link performance with data recorded.
- 5) The 2′ dish, B was put back in the link and the performance was recorded.
- 6) The ACLcom C was put back into place.
The tables below do not follow the test order as the third line of data was actually the last test performed.
A-Jirous JRC-29EX MIMO
B-Jirous JRC-29EX MIMO C-AGLcom – PS-6100-30-06-DP D-AGLcom – PS-6100-29-06-DP-UHP
Table 1 is the signal strength results of the various dishes on the link. The first line, A-B, is the original Jirous to Jirous. A is the first two columns of the link and are the A side and the last two columns are the B side on the link. What is of interest is that exchanging B to C in the second line brought the signal deviation between the channels to only 1db and 0 db as seen in Table 2. The third line was a result of replacing the horn on the A dish and optimizing the setting on the AF5X radios. This changed the signal by around 7db and improved the link capacity, Table 3. Clearly, the A dish had a problem with the original horn.
In the fourth line, D-B, the signal strength improved as well at the signal deviation on the two channels, Table 2 first two columns. This link was not optimized. The fifth line, D-C is both AGLcom dishes which improved the bandwidth, Table 3, and the signal deviations, Table 2. The final line, D-C, was the previous line optimized. The signal strengths moved closer together and the bandwidth improved.
Link Ch0 Ch1 Ch0 Ch1
- A-B -73 -76
- A-C -73 -74
A*-C -64 -66
- D-B -63 -62
- D-C -62 -62
D*-C -60 -60
-70 -74 -71 -71 -65 -66 -59 -59 -58 -58 -61 -61
Signal Strength (* optimized data) Table 1
Table 2 has four data columns, the first two being the measured results and the latter two being the measured difference from theory. The Jirous and AF5X calculators were used for the theory signals. Clearly the signal approached the theoritical limit with the optimization and with the change of dishes. The optimization improved the signal by ~9db for the link that we replaced the horn on the Jirous and by ~2db for the AGLcom link.
Link dSig dSig A-B 3 4 A-C 1 0 A*-C 2 1 D-B -1 0 D-C 0 0 D*-C 0 0
dSig dSig -16.5 -17.4 -17.0 -15.0 -8.0 -9.0 -13.3 -5.3 -7.0 -4.3 -5.0 -6.0
Signal strength variation from theory Table 2
The band width improvement was more obvious, Table 3, from 22 Mbs to 39 Mbs for the RX and 144 Mbs to 141 Mbs TX for the link with the horn replacement. The bandwidth improvement for the optimization of the AGLcom link was from 61Mbs to 66Mbs RX and from 211Mbs to 267Mbs for TX.
The bandwidth improvement from the original, optimized link to the AGLcom link is from 61Mbs RX to 67Mbs and from 210Mbs TX to 267Mbs. There is a clear improvement for the AGLcom link over the Jirous link.
- A-B 22.5
- A-C 39.0
- D-B 61.4
- D-C 60.6
BW-TX 144.6 141.4 210.0 211.0 215.0 267.6
The data supports a measurable improvement in both signal strength and bandwidth with the use of the AGLcom dishes. However, it is difficult to quantify the improvement. The Jirous dishes were identical whereas the AGLcom dishes were not. One of the jirous dishes was under performing initially but was repaired for the last tests. Additional testing is needed to provide accurate data analysis and performance comparison. The best performance tests would involve identical AGLcom dishes, ideally two links, one each of both types of dishes.
Disclaimers. I have been in the ISP world since 1991. I cut my teeth on BBS systems and moved onto dial-up. I am also an independent Cambium certified consultant. Read about the consultant program here... I also have clients who run a wide variety of UBNT products, and the last ISP we sold was 90 percent UBNT. We run some UBNT routers in MidWest-IX as well. My father was an attorney for over 40 years. I grew up around attorneys, have regular conversations with friends who are attorneys, and was learning about the law from the time I was 10. Having said that, I am not an attorney. Nothing in here should be construed as an official legal opinion.
So let’s get some background on what has transpired with Cambium and their elevate software. Cambium came up with a way to load their software onto select UBNT wireless units and, after a reboot, had the cambium EPMP software active on them.
Why did this work?
UBNT Airmax radios use U-Boot loader. If you want to read all about it you can read the references at the bottom of this article under References. The thing to know is it is released under the GNU General Public License.
UBNT and Cambium EPMP both use “commodity” wifi chipsets. This keeps the cost down and the software becomes the majority of the “special sauce” that makes them different. This is in contrast to the UBNT Airfiber and Cambium 450 lines. These use custom made chipsets. This is is one reason those lines are more expensive.
By using an open source bootloader and commodity hardware Cambium was able to figure out how to load their own software onto the UBNT devices. UBNT countered with modifying the bootloader to accept only signed software images. The only images that were recognized were ones signed by UBNT. If you are interested in learning more about signed software go here: https://www.quora.com/What-does-signed-firmware-means
Cambium came up with instructions on how to downgrade and by-pass the ability to only load signed firmware onto the device. The method I am aware of is downgrading the installed UBNT firmware to a certain version.
All in all the Elevate process turned the UBNT hardware into a device running Cambium’s software.
The gray areas aka this is why we have attorneys
There are several arguable points in this lawsuit. If you want to read articles on the Lawsuit
Debate #1 – The Hardware
The term Software Defined Radio (SDR) has been around for quite some time now. Basically, this is a radio with very little RF elements to it. Ham radio has been using SDRs for quite some time now. The idea is the manufacturer uses off the shelf components to build a single radio which can do various functions depending on what software is loaded. It also allows features in the chipset to be activated and licensed should the programmer want to support them. It’s interesting to note Wireless is not the only place this is happening. Software Defined Networking (SDN) is a growing thing, as well as a plethora of devices. A PC could be considered a software-defined device. More on that later.
So an argument could be made the UBNT devices are a software defined radio. they did not use custom chips. They most certainly have a proprietary board layout, but that is not a criterion in an SDR. So if a customer buys a piece of hardware, should they be able to load whatever software they want on it?
An argument saying yes they should can be pulled from many areas. This Verge Article (more in the reference at the bottom) says the Government ended the debate in 2015 giving consumers the ability to Jailbreak their phones and devices without legal penalties. Before that is was briefly illegal to “Jailbreak” your phone. This was mainly lead by Apple. The government said it was fair use to Jailbreak, but not carrier unlock your phone without permission.
Apple also went through this briefly when they switched to Intel processor chips. People were figuring out ways to load Apple OSX onto Dells, HP, and other “PCs”. The debate was whether this was legal or not. The following article sums up why these “hackintosh” computers were shut down. By clicking on the “Agree” of the End User License Agreement (EULA) before installing OSX you agree to a great number of things. The short of it was the user license of OSX says you can not install this on non-apple hardware. However, it says nothing about installing non-Apple Operating systems on the hardware. Apple knows it is commodity hardware. If you want to buy a 2000 mac and put windows 10 on it, go ahead. They even help you with an option called Bootcamp.
Our last example is the Linksys WRT54G and DD-WRT and its variants. A quick history of the DD-WRT Controversy doesn’t revolve much around the loading of the software onto Linksys hardware, it involves the use of the GPL license by DD-WRT. There were some FCC concerns, but we will talk about those later.
So the questions to be argued for this point:
Q1.Is the UBNT device a software-defined Radio?
2. Does the user have the legal ability to load whatever software they want to on hardware they own?
Debate #2 – Was the UBNT firmware “hacked” as they allege?
There are lots of unknowns here. Attorneys try to prove intent in arguments like this.
Did Cambium somehow reverse engineer the UBNT software, thus violating copyright laws? At what point is the line crossed? Since UBNT used a bootloader free to everyone, was the simple act of loading new software onto the units a hack? From what I know, and I am not a programmer, is Cambium used the bootloader to overwrite the UBNT software and install their own. How is this any different than installing Linux on a Dell PC? Computers have a bootloader called a BIOS. On a Wireless radio, where does the bootloader stop and the software start? To me, these are clearly defined. Bootloader and Image file.
If you boot up the UBNT unit out of the box without agreeing to the EULA have you violated the EULA? Can you be penalized for loading software onto a device you never had the opportunity to see and agree to anything? Did the simple act of taking it out of a box and booting it up via TFTP cause you to agree to something?
In a Brothers Wisp video on this topic, Justin Miller mentions some arguments on why this can be allowed.
Debate 3 – Did Cambium violate FCC rules?
If we believe the user has the ability to load software onto units they own it is the user, as well who developed the software to go on the device, to follow all laws then it is not up to UBNT to police this. This is the job of the FCC, provided it is agreed that once the user buys the hardware it is theirs. For this specific case, UBNT claims Cambium is violated allowed power limits by loading their software onto the UBNT device. Also, is the new device an FCC certified system? Most likely not unless it is resubmitted to the FCC for testing, and any labels removed and new ones added. However, this is not up to UBNT to enforce this. This is the job of the FCC.
Is UBNT being a steward of the community to bring this to the attention of the FCC, thus saving UBNT from possible issues with the FCC? Maybe, but why not bring suit against any of these others?
It’s interesting to note this page on HamNet
I am not a telecom attorney and I do not know the ins and outs. From what little I know of being in the industry you have to have an FCC certified system with proper identification stickers. I remember when UBNT had to send out stickers for units several years ago for DFS certification. You were supposed to put them on all your upgraded radios to be compliant. By changing the software did Cambium no longer make it a certified system? Or, because they use the same chipset is it still legal in the eyes of the FCC?
Debate 4 – Collusion and the end user
This is the biggest bombshell out of this whole ordeal and actually makes my blood boil. UBNT is suing Cambium of course. They are also suing a distributor and an end-user ISP. Cambium I can understand. UBNT is trying to protect their intellectual property and believe it was violated. They have every right to do so.
The distributor I can understand the argument. The distributor allegedly participated in distributing the “hacked” software. Not saying it’s right or wrong, but I can see why there would be the argument.
The most disturbing part of this an end-user ISP is named in the lawsuit. UBNT is suing a customer who was using the UBNT product and then decided to switch to a competitors product. In the case of elevate, the end-user ISP loaded the software onto their existing hardware. If we go along with the idea of you own the hardware, UBNT is suing a customer who bought their hardware and loaded the elevate software on it. This would be like Dell suing a school corporation for loading Linux onto new PCs they bought.
Many of the arguments you read are about you don’t own the software. If you buy the hardware, and it has a GPL licensed bootloader and load your own software onto the device, what laws have you violated?
Imagine this scenario. A user opens up a UBNT radio they bought. They see it uses an Atheros chipset, like many other radios. They write some code to talk to the hardware, all without ever looking at the software that came on the radio, boot up the unit via TFTP and load their own compiled image onto the hardware. All the while they never have seen the UBNT software. Did they violate any laws or user agreements?
This case and some others will help define who owns the hardware. We know the company, in this case, UBNT, owns the software. You have no legal standing to de-compile their intellectual property. That is cut and dry. What isn’t, is if they are using the same hardware everyone else, the same bootloader, is that considered proprietary? If not, and you overwrite their software were you allowed to because you own the hardware. Is the GPL bootloader considered proprietary? If we apply the analogy the bootloader is the same as the BIOS in the PC, no it is not proprietary. The BIOS debate has already been solved in court. Many of the PC debates have been loading a company’s software onto other hardware, such as Apple Hackintosh Computers and not the other way around, such as this case. As we talked in point 1, in the PC world, Apple even gives you the tools to install other Operating systems.
If UBNT sticks code in that says the bootloader only recognizes signed images is that “hacking” to put your own software on? Is this any different than Jailbreaking an Iphone?
So what does this all mean?
Going forward I believe we will see EULA and licensing agreements change. The hardware from a manufacturer will still be the property of the manufacturer, much like John Deere software.
The definition of what you own and have access to will change.
Proprietary bootloaders will take the place of Open Source bootloaders.
There will be a rise in manufacturers who make white box radios. Will there be a long-term solution? Only time will tell. We are seeing this trend in software-defined networking.
We will see more NDAs to end users about products. I believe we will see fewer case studies on newer products. End users will definitely be more tight-lipped about what they are doing.
So it will be interesting to see how this all plays out. Will there be enough precedent in the hardware world to squash some of this? Or does UBNT have a case? Obviously, UBNT has a responsibility to their shareholders to vigorously defend their Intellectual property. This case will help define where the commodity/open source items stop and where the intellectual property starts.
Where does this leave distributors? Do they want to continue carrying the Elevate product? Do they want to cut relationships with a manufacturer who has sued one of their own? The same goes for the end-user community. Do WISPs want to do business with a company that could potentially sue them for using and talking about a competitor’s product? Do the end users own the hardware they buy? If so, how much freedom do they have? If you don’t own the product, imagine the accounting ramifications.
Feds okay iPhone Jailbreaking
Is the Bios an Operating System?
Google Chromium OS
There has been much discussion on the performance of going from an N Series outdoor wireless system to AC. Not all AC is created equal. Right now there is AC Wave 1 and AC Wave 2. Just about all the AC stuff currently in the pipeline for outdoor wireless is wave 1. There is wave 2 indoor gear available, but for a WISP you are interested in the outdoor gear.
So what’s the difference?
For some reading about spatial streams, channel sizes, etc. look at this article https://info.hummingbirdnetworks.com/blog/80211ac-wave-2-vs-wave-1-difference
For the WISP folks who want the Cliff Notes version here are some key differences.
-Wave 1 uses 20,40,and 80 Mhz Channels. Wave 2 can support 80 and 160mhz channels. The 160mhz channel would be two 80mhz channels bonded together.
-Wave 1 can do 3 spatial streams. Wave 2 does 4. This requires an additional antenna to take advantage of wave2. This is a hardware upgrade from wave1 to wave 2.
-Wave 2 supports MU-MIMO. The AP can talk to 4 clients individually at once. The client must also support this, which is a hardware upgrade from wave 1 to wave 2 on both the client and the AP.
The question to ask your vendors is what is the upgrade path if you are using existing AC gear. If you are running AC currently you are most assuredly going to have to replace your AP radios and antennas. Will your existing clients work with the new AC wave 2 aps? An important thing to ask.