MTIN would like to announce updated bandwidth pricing for connectivity at the following locations in Indianapolis Indiana
733 West Henry Street
401 North Shadeland
701 West Henry *
731 West Henry*
Single Carrier Bandwidth
as low as $.17 per meg
Multi-carrier blend + CDNS + IX routes
As low as $.25 per meg
-Commit Levels as low as 50 megs
-95th percentile billing available
-Cross-connects as low as $50 per month
-Bandwidth options include Cogent, Hurricane Electric, MidWest-IX, and many others
*extended cross-connect fees may apply to these locations
Recently the FCC has put out a press release about updating the national broadband map. If you are a WISP and wondering why you aren’t on there ask your self this question: Have you been filing your form 477? If not, then that is why. If you are an ISP you are required to file form 477.
So, where do you begin? The above link will get you started. If you are confused by census tracts, blocks, 15 digit codes for, and the sheer amount of formatting you need to know you have come to the right place. Also, for you facebook users I will share a link to the WISPAMERICA 2018 session in Birmingham about what forms to fill out.
Option number one is your WISP billing platform may already support doing something with form 477. Many of the billing platforms geared toward the WISP industry already support form 477 exporting. Check with your vendor or have a conversation with one at an event such as the upcoming WISPAMERICA.
Second is an online service such as www.towercoverage.com. While many folks know towercoverage for their RF propagation maps, they can also turn data you can use for form 477. Here are some searches from the towercoverage.com wiki to get you started on their 477 support. If you are going to WispAmerica check them out in booth 600.
Lastly, but not least, we have firms such as wirelessmapping.com. Not only can they help you generate maps and data, but they can help you turn your data into marketing as well. They are also able to make sure you are filing your paperwork properly and in the correct format. In my local area, I see companies that do not have a coverage listed on the national broadband map. I can only assume this is an honest mistake due to an error in a census block mistake or improper coding.
If you don’t file your Form 477, not only are you doing yourself an injustice but not letting the government know you are there, but you are skirting the law as well. If the government does not know you are providing broadband to an area, they may let your competitor overbuild on taxpayer money. You are missing out on opportunities as well as potential fines.
Recently we had a teaching moment for a couple of folks who had not had much experience with aligning higher frequency antennas with very tight beamwidths. This particular day we were aligning 2 foot Siklu 80GHZ antennas.
One of the questions we often get asked is how do you align these? These questions are usually asked by someone who is familiar with aligning 5ghz antennas with a 10 or 20 degree beam which you can eyeball and has tried a microwave shot. They find out it is much harder. The higher you go in frequency the tighter and smaller the beam is. Distance also affects how far off you can be. Think of it as a laser pointer. If you have ever taken a laser pointer out at night and shone it a long distance you will notice even the slightest movement will cause it to jump inches, even feet. Keep laser pointer analogy in mind for this next section.
In order to understand alignment, we need to understand lobes on an antenna. An antenna is just a device that focuses radiation in a direction. In a licensed microwave setup, these antennas focus the radiation in a tighter “beam”. Let’s go back to our laser pointer analogy. Some laser pointers project a smaller dot at 10 feet than others. Same for antennas. The diagram below shows what is called the main lobe and the side lobe.
The way to get the best signal is to get both dishes locked on to the main lobe. Sounds easy right? With higher frequencies, you are talking about millimeter waves. This means the main lobe may only be 3mm wide, about the size of this text on a laptop screen. Now imagine trying to keep that 3mm beam in the center of a paper plate at a mile. On top of that, the difference between the main lobe and locking onto a side lobe could be the difference of 1-2mm. A slight wind can move a dish 2mm.
To give you a real-world example. A 2ft 23 GHz antenna having 3 dB beamwidth of 1.6 degrees. Allowing for a path length of about 2.5 miles (this is licensed 23GHZ) the actual beamwidth at the receiving antenna is around 370 ft and is, therefore, likely to be greater than the height of the tower. If the antenna’s out of horizontal by even a couple of degrees to start, the antennas will miss by around 460 ft and not be able to “see” each other. This can be amplified as frequency and distance increase.
This is all fine and dandy, but what about the practical world? How do I align the thing?
It all starts with the FCC path coordination paperwork you will receive on your licensed link. There is a wealth of information in here. It tells you all of the following:
-Your mounting height (this is typically already known)
-Your heading (more on this in a bit)
-The antenna angle downtilt or uptilt (very important)
-The expected signal target
Armed with this information you will have all of the information you need to align the link. From this point, the philosophical side of things kicks in. Some tower climbers are good with using a compass to get their exact bearings. Others have high dollar tools to do it all via GPS such as microwave path alignment from Sunsight.
What everyone doing alignment should have in their toolkit are the following:
-A small magnetic bubble Level. We want to make sure we start with a level mount. We would be fighting an uphill battle if the pipe or standoff we are mounting to is not level.
-An angle Finder is very helpful for determining the antenna down or uptilt per the path calculation.
Obviously, the above tools are just one of many examples. There are more expensive ones and bare bones ones. Tools are only as good as the person using them.
-Ratcheting wrenches for the left and right and up and down adjustments.
Having ratcheting wrenches makes fine-tuning a very easy process. You will see why later.
-A good hands-free communication method. Depending on the tower FM communications may or may not work. Cell phones may or may not work. Being able to talk to the crew on the other end is crucial. And yes, to make this smooth you want a crew on the other end.
Aligning backhauls, especially microwave, is a skilled trade. With any skilled trade, you will get all kinds of tips and tricks of the trade. Some you may use, others you may not. Ask any Carpenter, Drywaller, or Mason and they will tell you little tips and tricks. They probably all are great and will work, but you may only use some of them. I am going to tell you mine. You may find others you like better.
We always start with a google earth plot of the path. I call this Phase 1. The goal of phase 1 is to get the radios talking. We make sure the line is exactly on the two points, not just approximate. If the backhaul it on the left side of the tower, we draw the line to/from the left side of the tower. We then pick 2-3 landmarks along the path as we can. We start with something close to the tower the climber should be able to see.
In our photo above we have picked out two reference points close to the tower the climber can see. The first is the clump of trees on the climbers left. The path passes “just to the right” of the edge of the end of the trees. The second reference is the intersection of the county roads about 2-3 miles out. Our path should be just to the right of those. That point of reference is more of a sanity check. More than anything. The climber at the other end has a similar printout. I have found communication during this process works best if both climbers and someone logged to at least one radio on the ground with a laptop are on a conference bridge. Many radios have lights, tones, or multimeter outputs to indicate signal. Some modern radios only have web-interfaces and apps. Hold a phone while trying to align can be cumbersome. This is where the guy on the ground can take some load off what the climbers are doing.
Regardless of the mechanics of the radio, the goal of Phase 1 is to establish a radio link, no matter how bad it is. Now, here is where the real meat and potatoes of backhaul alignment come into play. This is a very deliberate and calculated process. Your goal at the end of the entire alignment process is to end up with the following diagram
What many folks don’t realize is it is possible to establish a signal on a side lobe. So how do you know if you are on a side lobe? Here is how we start phase 2. This is what I call fine-tuning. Real original huh? Depending on good, or lucky you were during phase 1 you may have a long way to go or a short way to go to meet target. Remember that in your paperwork we talked about earlier? One side and one side only starts moving their fine adjustment on their antenna to the left and right and up and down. This is typically called sweeping. The key thing to note here is you need to find the very edges of the radio signal, not just the lobe you happen to be on.
Let’s take a real-world example to explain how sweeping affects main and side lobes. At the start of this article, we mentioned an 80ghz link. With our phase 1 rough alignment, we were able to get linked at a -86. The target was a -32. The first side to start alignment started sweeping to the right, signal started going from a -86 down to a -72 rather quickly. This was using very small turns of the adjustment. The ratcheting wrench was only clicking 1-2 times for each 2-3 db of signal change. Once it reached a -72 it started climbing back up. The climber then kept going to the right to find the edge of the signal, not just the lobe we were on. The signal started getting worse until we were back into the upper 80’s.
Now, the climber brings the alignment back to the left, and stops at the -72 and makes a mental note of where that is in relationship to the overall placement of the dish, etc. Some mounts have distinct notches, some guys use markers, others just remember. Now the climber continues on to the left and the -72 gets worse and goes back down to the -86 and continues to get worse. So the climber, at least for now, has found the sweet spot for the left and right alignment. The climber also knows this will probably change, but has found it for now. Climber repeats the same procedure for the up and down. Due to the anglefinder, the climbers have with them they feel pretty confident they are fairly close with the up and down so they do not adjust the up and down travel as much as the procedure goes on.
Next, the other side does the same procedure the first side did. They do the left to right and get the signal down to a -62. Essentially, what the climbers are trying to do is find the center, which will contain the strongest signal, by sweeping past the other signals. Keep in mind there may be only millimeters separating these other lobes. Due to physics, and the shape of the signal, the first lobe is actually stronger than the edges of the main beam.
Say what? The first lobe is stronger than the edges of the main beam? Yes, but not stronger than the main beam. Let’s go back to our installers. They have each had a go around at alignment and are only at a -62. On a 5ghz backhaul that would be respectable, depending on your noise floor. But we are 30db away from our target of -32. Some climbers, incorrectly I might add, try to do a shortcut by scanning in an x pattern instead of x and y-axis separately. This makes it easier to lock onto a side lobe.
So now our first climber goes back to making the left and right adjustments. At this point, the installer finds something odd. He has gotten the signal down to a -55, but that’s the best he can do. Even a small turn jumps the signal up Then our installer remembers the above statement. The first lobe is always stronger than the edges of the main beam. He gets the signal back down to a -55 and turns the alignment over to the other side.
Here is a very important thing to note. Both of our installers have now “gotten a feel” for the few turns needed to adjust the signal on these dishes. To them compared to 5ghz dishes, these are very tiny and almost insignificant movements. But they sure make a difference in signal. Now our installer at tower B has his second alignment session. As he is making adjustments the signal is not changing. He is moving his wrench for what seems like forever and the signal is barely moving, Any other time their signal would have been a -90 or dropped. What has happened here? The main lobe of one side has locked onto the first lobe because it is always stronger. Since the main lobe is bigger it seems like it takes forever to make any change. If we had a guy on the laptop he was probably also probably seeing very mismatched data rates. One side was probably much higher than the other by a large margin.
Then boom, all of a sudden the signal goes from a -55 to a -42. A 17 db jump! We can now tell we are on the main lobe. If the laptop person looks at the data rates now they should be more balanced.
At this point, it is just a simple matter of each side making finer and finer adjustments back and forth to get the signal down. If you think of the above circle/crosshair you are making smaller and smaller adjustments to nudge toward the center of the circle. This is where the ratcheting wrenches help by giving a very measured amount of travel. This helps with the whole feel of alignment. Much of it is feel to see how much you can move the adjustment mechanisms to make the numbers move. Sometimes it may be a single click of the wrench. Sometimes it may be one or two. It just depends. As you get closer and closer to target you are moving the adjustment less and less.
As you get closer and closer to target you need to be thinking about how tightening down the adjustment bolts will affect the alignment. Even tightening them down snug can affect the signal. That extra amount movement to tighten them down can move them slightly past their alignment center. You may need to take into account the amount of travel it takes to tighten down the adjustment bolt into account on smaller dishes. If it takes a half turn of the bolt to get it tight you may need to stop a half turn and tighten “into” target. As you tighten it down fully that is where you end up in align. If you wait until you are in align and then snug it completely down, the force of snugging it down may pull it past and you will end up with a worse signal.
This article sprinkled in some examples from a real-world install, with some theory, with some practical knowledge. Your mileage and experience will vary. Your experience with 6ghz vs 80ghz will vary as well. Each frequency will have it’s own quirks and tricks.
MTIN typically is not a reseller for many product lines, for several reasons. We like to be vendor agnostic and not chasing sales commissions on products, and we are not in the business of stocking product.
Having said this, we now have a reseller relationship with flexoptic.net. They have optics you can code for a huge variety of manufacturers. WISP clients will be intersted to know they support the following vendors:
and a whole bunch more. There are over 150 vendors supported.
The optics are coded with a product called Flexbox. The flexbox has several features to it such as coding, wavelength tuning of DWDM, distance analyzer, power measurement, and diagnostics.
We are working on some reviews, how-tos and other tutorials for these products. At the very least we are recommending everyone have a few optics of the form factors you use for compatibility troubleshooting. If you have a device that you wonder if it is recognizing your optics correctly you can pull out this kit, code an optic for your device, and go on with troubleshooting. Very handy for vendor optic issues.
If this is something you are interested in send us an e-mail for a quote on a starter kit and look for more information coming soon.
Some Light Reading:
Many Authoritative nameservers today return different replies based on the perceived topological location of the user. These servers use the IP address of the incoming query to identify that location. Since most queries come from intermediate recursive resolvers, the source address is that of the recursive rather than of the query originator. Traditionally and probably still in the majority of instances, recursive resolvers are reasonably close in the topological sense to the stub resolvers or forwarders that are the source of queries. For these resolvers, using their own IP address is sufficient for authority servers that tailor responses based upon location of the querier. Increasingly though a class of remote recursive servers has arisen that serves query sources without regard to topology. The motivation for a query source to use a remote recursive server varies but is usually because of some enhanced experience, such as greater cache security or applying policies regarding where users may connect. (Although political censorship usually comes to mind here, the same actions may be used by a parent when setting controls on where a minor may connect.) When using a remote recursive server, there can no longer be any assumption of close proximity between the originator and the recursive, leading to less than optimal replies from the authority servers. A similar situation exists within some ISPs where the recursive servers are topologically distant from some edges of the ISP network, resulting in less than optimal replies from the authority servers. This draft defines an EDNS0 option to convey network information that is relevant to the message but not otherwise included in the datagram. This will provide the mechanism to carry sufficient network information about the originator for the authority server to tailor responses. It also provides for the authority server to indicate the scope of network addresses that the tailored answer is intended. This EDNS0 option is intended for those recursive and authority servers that would benefit from the extension and not for general purpose deployment. It is completely optional and can safely be ignored by servers that choose not to implement it or enable it. This draft also includes guidelines on how to best cache those results and provides recommendations on when this protocol extension should be used.
For those of you running BIND here is some practical information
Like many networks, you have users using Apple devices. iPhones, Ipads, computers, and other Apple devices are constantly updating apps, downloading updates, and other content. MTIN can install an OSX Caching server on your network. This low powered server caches software updates, allowing faster downloads, especially for new iPhone IOS updates.
Contact MTIN today and learn about our turnkey solutions for making your Apple users happier.
Imagine this scenario. Outside your house, the most awesome super highway has been built. It has a speed limit of 120 Mile Per Hour. You calculate at those speeds you can get to and from work 20 minutes earlier. Life is good. Monday morning comes, you hop in your 600 horsepower Nissan GT-R, put on some new leather driving gloves, and crank up some good driving music. Your pull onto the dedicated on-ramp from your house and are quickly cruising at 120 Miles an hour. You make it into work before most anyone else. Life is good.
Near the end of the week, you notice more and more of your neighbors and co-workers using this new highway. Things are still fast, but you can’t get up to speed like you could earlier in the week. As you ponder why you notice you are coming up on the off-ramp to your work. Traffic is backed up. Everyone is trying to get to the same place. As you are waiting in the line to get off the superhighway, you notice folks passing you by going on down the road at high rates of speed. You surmise your off-ramp must be congested because it is getting used more now.
Speedtest servers work the same way. A speedtest server is a destination on the information super-highway. Man, there is an oldie term. To understand how speedtest servers work we need a quick understanding of how the Internet works. The internet is basically a bunch of virtual cities connected together. Your local ISP delivers a signal to you via Wireless, Fiber, or some sort of media. When it leaves your house it travels to the ISP’s equipment and is aggregated with your neighbours and sent over faster lines to larger cities. It’s just like a road system. You may get access via a gravel road, which turns into a 2 lane blacktop, which then may turn into a 4 lane highway, and finally a super-highway. The roads you take depend on where you are going. Your ISP may not have much control over how the traffic flows once it leaves their network.
Bottlenecks can happen anywhere. Anything from fiber optic cuts, oversold capacity, routing issues, and plain old unexpected usage. Why are these important? All of these can affect your speedtest results and can be totally out of control of your ISP and you. They can also be totally your ISP’s fault. They can also be your fault, just like your car can be. An underpowered router can be struggling to keep up with your connection. Much like a moped on the above super-highway can’t keep up with a 600 horsepower car, your router might not be able to keep up either. Other things can cause issues such as computer viruses, and low performing components.
Just about any network can become a speedtest.net node or a node with some of the other speedtest sites. These networks have to meet minimum requirements, but there is no indicator of how utilized these speedtest servers are. A network could put up one and it’s 100 percent utilized when you go running a speedtest. This doesn’t mean your ISP is slow, just the off-ramp to that speedtest server is slow.
The final thing we want to talk about is the utilization of your internet pipe from your ISP. This is something most don’t take into consideration. Let’s go back to our on-ramp analogy. Your ISP is selling you a connection to the information super-highway. Say they are selling you a 10 meg download connection. If you have a device in your house streaming an HD Netflix stream, which is typically 5 megs or so, that means you only have 5 megs available for a speedtest while that HD stream is happening. Speedtest only test your current available capacity. Many folks think a speedtest somehow stops all the traffic on your network, runs the test, and starts the traffic. It doesn’t work that way. A speedtest tests the available capacity at that point in time. The same is true for any point between you and the speedtest server. Remember our earlier analogy about slowing down when you got to work because there were so many people trying to get there. They exceeded the capacity of that destination. However, that does not mean your connection is necessarily slow because people were zooming past you on their way to less congested destinations.
This is why speedtest results should be taken with a grain of salt. They are a useful tool, but not an absolute. A speedtest server is just a destination. That destination can have bottlenecks, but others don’t. Even after this long article, there are many other factors which can affect Internet speed. Things we didn’t touch on like Peering, the technology used, speed limits, and other things can also affect your internet speed to destinations.
For years we have done the following naming conventions for our DNS servers.
NS is reserved for authoritative name servers
DNS is reserved for caching servers.
For MTIN we have NS1.MTIN.NET and NS2.MTIN.NET which are authoritative for domains we host. DNS1.MTIN.NET and DNS2.MTIN.NET are for managed DNS customers.
Below, We have some visio diagrams we have done for customers.
This first design is a customer mesh into a couple of different data centers. We are referring to this as a switch-centric design. This has been talked about in the forums and switch-centric seems like as good as any.
This next design is a netonix switch and a Baicells deployment.