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RELATED: What Are Dual-Band and Tri-Band Routers? Right now MU-MIMO tops out at four streams, which means that if you add a fifth device to the network, it will have to share a stream with another device in the same way a SU-MIMO router would, which sort of defeats the purpose. Yes, you can buy a compatible MU-MIMO wireless USB dongle for desktops or laptops, but they’re quite a bit more expensive than regular SU-MIMO receivers, which could prevent some users from taking the plunge.Īlso, there’s the issue of maxing out your available streams.
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That means that even if you drop the extra coin on a router with MU-MIMO capability (usually about $50 more, depending on the model), it will likely be a number of years before every device in your home is able to use the feature as intended. Even fewer devices actually have MU-MIMO. As of this writing, there are a only few laptops that have MU-MIMO-ready wireless receivers, and a select number of smartphones and tablets that come with a Wi-Fi chip that knows what to do with a MU-MIMO stream (like the Microsoft Lumia 950).
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The main benefit here is that instead of each stream being periodically (albeit very, very briefly) interrupted by the time it takes for the carousel to spin around once, a MU-MIMO router can keep its signal constant for those four devices, and fairly distribute the bandwidth to each without compromising the speed of any of the others at the same time.Īll this sounds great, right? It is, but as with most network-related features, there’s one big drawback: in order for MU-MIMO to actually work, both the router and the receiving device need to have full MU-MIMO compatibility in order to communicate with one another.Ĭurrently, MU-MIMO routers are only able to broadcast over the newer 802.11ac wireless protocol, a signal that many devices haven’t been updated to decode just yet. Without getting too technical, this is like each device getting its own “private” router, up to four total in 4×4 MU-MIMO loadouts. This way, the MU-MIMO carousel can simultaneously send Pez flying in four directions at once. “MU-MIMO” routers, on the other hand (“Multiple User, Multiple-Input, Multiple-Output”) are able to break up this bandwidth into separate, individual streams that each share the connection evenly, no matter the application. MU-MIMO routers come in three flavors: 2×2, 3×3, and 4×4, which refers to the number of streams that they can create for each device in your household. Even though SU-MIMO routers can only open up one stream at a time, they do so in very rapid succession, which to the naked eye looks like a solid stream of data. To borrow an analogy, think of it like a Pez dispenser strapped to a carousel: everyone standing around the circle is eventually going to get a piece of candy, but the carousel still needs to make one full rotation before all the members of the network are satisfied. This means that if you have one person watching Netflix and another watching Youtube, if you were to start both those streams at the exact same time, one device would get priority while the other had to wait until the first had buffered a few bits of data for itself. Most modern routers use “SU-MIMO”, or “Single User, Multiple-Input, Multiple-Output”. With these routers, only one device can receive data at any given time. “MIMO” stands for “Multiple-Input, Multiple-Output”, and it refers to the way bandwidth is broken up by a router and pushed to individual devices.