<    March 2017    >
Su Mo Tu We Th Fr Sa  
          1  2  3  4  
 5  6  7  8  9 10 11  
12 13 14 15 16 17 18  
19 20 21 22 23 24 25  
26 27 28 29 30 31
01:41 <jfhbrook> what is mumimo
02:32 <ec> MIMO, Multiple-Input-Multiple-Output, in terms of RF, refers to ...
02:33 <ec> well, basically, having multiple antennas on both the transmitter and receiver, that are spatially distinct (separated slightly) from one-another —
02:34 <ec> and then because those various antennas have different interference dead-zones and peaks with respect to one another as signals bounce around a room, and with respect to the chosen frequency … software can dynamically allocate frequencies/bandwidth to each antenna pairing such that they receive *different data* on each antenna.
02:34 <ec> it's kinda magical.
02:35 <ec> and the MU stands for Multiple-User — so that different users *at different locations in the room* can be negotiated. i.e. my phone on the couch might be in a dead-zone for a particular frequency that *peaks* near where you're standing in the kitchen, so a MU-MIMO router with multiple antennas can tweak the entire radiating-system to send signals to me
02:35 <ec> that your phone *doesn't even ever see*
02:35 <ec> meaning the receiving device effectively, magically sees less interference when there's multiple devices transmitting/receiving
02:36 <ec> the *real* benefit of that being much higher bandwidth, much higher speed, and thus huge battery-life benefits (because the transceiver spends less time woken up and operating, and more time in ‘sleep mode’.)
02:36 <ec> unfortunately 802.11ac MU-MIMO is *downlink-only* — so it's only effective for downlink-heavy operations like streaming video and shite. technically DL-MU-MIMO.
02:37 <ec> meanwhile there's SU-MIMO, if you have very few wireless devices, which is both downlink-uplink ... but is only useful for as many antennas as *both the AP and the client have*, i.e. most cellphones only have one antenna, except very modern MIMO-capable ones, which have maybe two
02:37 <ec> so in SU-MIMO, only two of those six or eight or wtfever big honking antennas on your modern MIMO router are actually getting used.
02:38 <ec> DL-MU-MIMO means the PS4 you're streaming Hulu on kinda-sorta-pairs to two antennas on your router, your syncing-OTA iPhone pairs to another two, and your Time Machine backing-up MacBook Pro uses two more
02:39 <ec> all done b/cuz of the magical and dynamic measurement of dead zones in the signal? kinda? I guess?
02:39 <ec> hahaha sorry I got *realllllly* in-depth into this today
02:45 <jfhbrook> dang
02:45 <jfhbrook> and here I was happy I was able to install php and dokuwiki on a vagrant box
02:45 <jfhbrook> next steps are to ansible-ize my work, prepare for using it "in prod" and then buy the domain and create the DO box
02:48 <pikajude> ansible
02:48 <pikajude> why not docker
02:56 <jfhbrook> because docker sucks
02:56 <jfhbrook> seriously, I do not like docker
02:57 <jfhbrook> ansible's a good fit for the scale I'm looking at, which is one machine
02:58 <pikajude> oh ok
02:58 <jfhbrook> it's a couple of apt-get calls, a templatized nginx config or two and an untaring/repermissioning
02:58 <jfhbrook> a bit of a wrinkle for turning on and off the "install.php" hook, and who the hell knows with ssl
04:54 _whitelogger joined
06:57 _whitelogger joined
07:05 ohhmaar joined
09:01 prophile joined
10:25 mylesborins joined
15:50 fujisan joined