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Problem 2: Many hops increases the latency. This will be most apparent at the network “edges” - the areas several hops away from the resource people are trying to access, such as the gateway to the Internet or a local server. The throughput will decrease rapidly because of this. Problem 1: Every hop on the network takes one-half of the bandwidth away. In a long “chain” of mesh links, this results in a very slow connection from end to end. This happens because wireless links can only do one thing at a time - transmit or receive. In a mesh network, every link, or “hop,” between routers will decrease the bandwidth by half. Even so, the performance gains are very significant. It can also take longer to set up the network, since there are additional devices. Performance can be increased by using more routers, or more expensive routers. These routers are more expensive, and can be more complicated to set up.
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The mesh links and APs can then be on separate channels and work simultaneously. Some high-end routers, such as the MikroTik RB433 have multiple radio cards.
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One example of a dual band router that supports mesh functions is the TP-Link WDR3600. Most outdoor routers are single-band, so this may require some creativity with mounting indoor dual-band routers in outdoor waterproof boxes. You can separate the mesh and AP functions to each band, allowing the router to perform both functions simultaneously. There are two Wi-Fi bands - 2.4GHz and 5GHz.
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They can also be placed outside to provide access in public areas. These should be connected with Ethernet cables to the mesh network. These can be very low cost, such as the TP-Link WR841ND, and don’t need to run Commotion - they just need to provide a “bridge” to the mesh network. Solution 1: Use separate routers for Access Points. There are several ways to split the function between devices: Generally, you just need to have the rooftop or outdoor routers performing mesh functions only, and then attach additional Access Points to them to connect people. There are several solutions to this problem, most of which involve additional equipment. This makes the time-split problem even worse. The signals from people’s devices aren’t as strong - so the routers have to listen more carefully, which takes more time. This allows the signals to go further, and makes it easier for neighbor routers to hear them. Outdoor routers used for mesh usually have a much higher wireless power than smartphones and laptops. Laptop and smartphone signals are much weaker than router signals. Problem 2: When some people are shouting, and others are whispering, it becomes difficult to hear the whisperers. This cuts the time available to do either function in half, reducing the performance. Splitting time between the AP signals and the Mesh signals is hard because the router can only transmit or receive one signal at a time – it has to alternate these functions. This design can cause problems for two reasons: This can simplify the network, as you don’t need as many pieces of equipment, but it causes performance problems. Every router should do just one thing ProblemĬommotion and many wireless mesh firmwares can “split” the wireless function of the router so that it creates a mesh link and an Access Point (AP) at the same time.
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If you are going through these guidelines in a group, or for a workshop, you can download a one-page handout that offers a much shorter version of the document below. Otherwise, try and design with these in mind. In some cases, such as very small networks, you may be able to skip some of these guidelines. The document below describes five guidelines to keep in mind when designing your network. There are many ways to design a community wireless network - but many options can lead to confusion! Fortunately, many community networks and Wireless Internet Service Providers (WISPs) have had many years of experience to learn from.