Tag Archives: farm network

The hard part of wireless networking: the wires.

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It’s actually an old joke in the wireless networking world: what’s the worst part of wireless networking? The wires!

(OK, it’s an old dumb joke…)

While having WiFi all over the farm is incredibly useful, the only way to make it happen is using Ethernet cables. While Ethernet cables are very simple devices, there are an amazing number of variations and types of Ethernet cables, an choosing the wrong ones (or using them poorly) can cost you time and money.

What is an Ethernet cable?

Courtesy of WikiMedia

Ethernet cables all have some common characteristics: they contain 4 pairs of wires, with each pair twisted around each other (so they are called “twisted-pair” cables). They have an outer sheath to protect the wires inside and they use RJ-45 connectors to connect to networking devices.

The 4 pairs of wires inside the sheath are usually colored green, brown, blue, and orange – one solid and one striped for each color. The wires are usually 100{8fd1ffa65f67a2e931916b3c1288d51eed07dc30586a565c92d055673de7c64e} copper, but some cheaper cables are made of alloys. Alloy cable works OK for short lengths, but should not be used for cables longer than 25 feet. There is sometimes an uninsulated wire running down the middle of the cable called a “drain wire” – this is meant to provide a common ground for the equipment the cable is connected to.

The wires are usually about 24 gauge (AWG), but some cheaper cables use 26 gauge wire, and some more expensive cables use 22 gauge wire. Obviously, the bigger the wire the better, as long as it’s pure copper, but bigger wire also makes heavier cables. It makes a difference if you’re hauling it up a ladder, believe me.

Kinds of Ethernet Cables

Under the sheath, some cables have a shield made of metallic braid or foil. This shield keeps outside noise from penetrating the cable and disrupting the signal on the wires. Unshielded cables are designated as “UTP” (Unshielded Twisted Pair), while shielded cables are designated “STP” (Shielded Twisted Pair). Our experience shows that any cable over 25 feet should be shielded to prevent corruption of the data on the wires and maintain the speed of the data.

You will see, shopping for Ethernet cables, that there are several “Categories” of cable – Cat 5, Cat 5e, and Cat 6 are the common ones available now. The differences are in the speed rating of the cables – Cat 5 can pass data at 10 Mbps or 100 Mbps, Cat 5e can pass data at 10, 100, or 1000 Mbps, and Cat 6 can go up to 10 Gbps. Any of these will work well with AyrMesh equipment – we usually buy Cat5e cables because they are less expensive and widely available. The main physical differences in the cables is how tightly the wire pairs are twisted together.

Finally, the sheath itself can differ quite widely. The normal sheath is usually a form of polyolefin, which does not burn easily. “Plenum-rated” and “Riser-rated” sheaths are coated with a low-smoke PVC, which makes them even more flameproof and reduces the toxicity of the smoke if they do catch on fire. “Direct burial” cables generally have a very thick and heavy sheath, and they may contain a gel that prevents a nick or cut in the cable from admitting water into the cable. Obviously, if water gets into the cable, the wires can corrode and the cable will go bad, but direct burial cables are usually very stiff and very heavy, making them extremely difficult to work with.

Whichever cable you choose, it is imperative that you handle it correctly. Because the cable consists of a bunch of small wires, it is really no stronger than any of those wires. It’s very easy to get a kink in a cable when you’re pulling it through a hole, for instance, and break one of the wires. When that happens, the cable is generally useless.

General Guidelines for Ethernet cables used with AyrMesh products

  • Make sure the cables are all-copper and shielded (STP) if they’re 25 feet or longer.
  • Try to get 24 or 22 AWG wires in the cable.
  • Get plenum-rated or riser-rated cables for use indoors, but don’t use direct burial cables unless you’re going to bury them – they’re too hard to manage.
  • ALWAYS leave a “drip loop” when you’re bringing a cable run from outside to inside a building so water doesn’t run down the cable and ruin equipment!
  • Be VERY careful pulling cables – they are more fragile than they seem!

New Ayrstone Product: the AyrMesh Receiver

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Today we’re announcing a new product in the Ayrstone AyrMesh line: the AyrMesh Receiver.

The AyrMesh Receiver is actually, of course, more than a receiver – it transmits and receives data – but it is designed as a simple, low-cost way to put one or more “wired” (Ethernet) devices onto an AyrMesh network. It is very similar to our AyrMesh Hub, but with a couple of important differences:

  1. The AyrMesh Receiver connects to the Hub’s WiFi signal, not the wireless mesh signal.
  2. The AyrMesh Receiver does not create its own WiFi access point – it is a client device only
  3. The AyrMesh Receiver uses a directional antenna for maximum range – it can be positioned up to 2 miles away from an AyrMesh Hub (optimal conditions).

Typical uses for the AyrMesh Receiver include:

  1. Using high-end IP cameras or other network devices that do not have WiFi
  2. Bringing the AyrMesh network inside of metal buildings – an AyrMesh Receiver can be placed on the outside of the building and devices inside can be connected to the LAN port of the receiver. You can even put a WiFi access point inside the building so you have WiFi indoors as well as outdoors.
  3. Connecting devices like network-enabled weather stations in more distant fields – since the AyrMesh Receiver can be up to 2 miles from your furthest Hub, you can now include areas in your network that were previously unreachable.

The AyrMesh Receiver is available now from Ayrstone – please see our website for details.

Wireless Farm Networking: what and why

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A few years ago, we identified a real need in the agricultural market for more robust, internet-connected farm networks. This was driven by our work in precision agriculture; what we saw was that there was a glut of usable data that could be helping growers make better (and more profitable) decisions, but that data was mostly trapped on personal computers and in-cab monitors.

As we looked at this situation, we realized there were two equally important needs which were interrelated: the first is a comprehensive platform for turning all this raw data into actionable information, and the second was a facility for collecting the data and putting it to use. But there’s a “chicken and egg” problem here: if you don’t have the data, you can’t turn it into information, but there’s no good way to collect and use the data currently.

The AyrMesh Hub

So we decided to tackle the second problem: create an “Enterprise Network” for farmers and ranchers, so they could collect data from their farm operations effortlessly and use that data to make more informed decisions. We realized, of course, that a typical network was not going to work for the farm: everything is very far apart, so laying cable (or even fiber) is generally not a workable solution. Besides, the network should ideally encompass the tractors, sprayers, and harvesters out working in the fields, so wireless is the only option. This was the impetus that gave birth to the original AyrMesh Hub.

The idea was fairly simple: take some of the ideas used in the “Roofnet” project at M.I.T. and adapt them to building a low-cost wireless mesh network for farm use. The key requirements were:

  1. Use WiFi – other, proprietary mesh networks had been tried, but they require a wireless “client” device for anything you want to put on the network. Lots of things have WiFi today – it’s an easy, familiar, open technology
  2. Design the system for a farm – provide good bandwidth to relatively few “clients” spread over a very wide area. Most WiFi devices in the market today are designed for exactly the opposite: a metropolitan mesh network, where you have many people in a very small area and high bandwidth demands.

What we have seen is that, like all technologies, there is an adoption curve. The first step is the desire to use one’s Internet connection beyond the confines of the house. Especially with the advent of smartphones and tablet computers like the iPad, the ability to have instant information and communications everywhere you go on the farm can be a reality, even if cellular data is not available everywhere on your farm.

A WiFi Camera

The second step is connecting sensors to the network to “keep an eye out” on your farm. The most popular and demanded sensor, of course, is the IP camera. The ability to bring up a view of an area of your farm, whether to see the settings on the grain dryer, keep an eye on livestock (especially in the middle of the night), or as the basis for a security system, cameras seem to have a place on every farm. But, moving forward, putting network-connected environmental sensors in livestock buildings and distant fields can bring terrific pro

A Weather Station at the edge of a field

ductivity gains. Knowing the temperature and humidity in your livestock barns can help optimize your HVAC usage, while knowing the wind and rainfall in a distant field can save a trip if it’s too windy or too wet to work.

Lots of data here…

In addition, some of the precision agriculture vendors are starting to put WiFi into their in-cab monitors, so you can access the data on those monitors over the network instead of having to move cards or USB sticks around. Being able to access your “as applied” and harvest data allows you (or your agronomist) to much more easily determine your variable rate applications as you go through the season, potentially cutting your costs and maximizing your yield.

Network-controlled relay, courtesy controlbyweb.com

The third step is farm control: being able to actually get things done on the farm over the network. Grain dryers, pumps, irrigation systems, HVAC systems, and other equipment could be controlled over the network. This means that you can potentially control your grain dryer from the bedroom, or even while you’re running errands in town, since your network is connected to the Internet.

What we learned in the 1990s and 2000s when networks were becoming ubiquitous in the corporate world is that the presence of the network creates opportunities to improve the business in unexpected ways. We don’t pretend to know what all the uses are for a wireless farm network, but we’re very excited to see what they are. We’re here at the very beginning of farm networking, and the future is limitless.